Chevy 350 popping through carburetor. popping through exhaust.

Chevy 350 popping through carburetor. I blew out my fuel lines to make sure they are not clogged.
 


Chevy 350 popping through carburetor He said it had about 75 miles on it when I purchased it. I can't figure out what the numbers on passenger side engine pad mean: (im0826 4vp). Everyone around me is smoking the tires at the lights and i'm just poping and looking stupid. Popping through the exhaust is usually a lean condition which causes an over-heated exhaust. I need advice on carb settings. When it gets into secondaries it backfires everytime. :auto14: Retired United States Army. compression Trav, Running open headers, hooker super comps. :auto13: 1957 Chevy 2 door Sedan 150. We usually refer to an exhaust backfire as a "backfire", and backfiring through the carb as "spitting" or "coughing". So I went to start it and it doesn't do anything and when it does it missed like crazy spudders out and backfires through the carb. Also check your fuel pressure and fuel filter, the eddy carb likes about 5 or 5. Too far advanced or retarded will pop out the carb, as will a lean accelerator Popping, backfiring through throttle body, please help. I have rechecked the timing and it is where I last left it (thank goodness!) at 16 degrees initial and max advance at 38 degrees all in at 3000 rpm. Still had the same problem popping through the exhaust under acceleration. I can’t figure out what it would be. Was driving today and went to punch the gas to accelerate and this noise started. However, when it happened on my SBC engine, I couldn't even rev it to 3,000 RPM. Video. I'm thinking it's a valve out of adjustment new cam and lifters. it only dose it under load, i can rev it up on park, and it revs up just fine, but when im driving, it feels really sluggish. Ended up being trash in the bowl for the accelerator pump (looked like packing grease). 1974 Chevy Nova 2 door- 2nd owner. 10 min read Carburetor Installation and Tuning. and elec. (New winter project. It's a very clean engine, so I know its not the exhaust. comes out the intake valve into the intake manifold igniting the air/fuel in the intake manifold which then pops out through the carburetor. JeepnGreg. No good, sadly. ( Carb backfires). For the first week it ran great, then one day after about a 30 min drive i noticed that it had no power, acted like it was bogging down every time i gave it gas. I also noticed the transfer slots in the carb were completely covered up, so I adjusted the curb idle screw so that I had the correct exposed amount of transfer slots (per Holley manual). A repetitive backfires are generated when the engine is simply running at idle or at cruising speed and can be inline with the engine RPM. i Engine 1987-1989 Vacuum Secondary 750 CFM Electric Choke. (fuel line, filters) is the popping through the carb sometimes when i mash the throttle quickly. The motor has been rebuilt, carburetors rebuilt, the TI and Amp has been rebuilt and coil was furnished by the rebuilder. I pulled off my It sounds like the carb float is stuck open and the pump is pushing gas out the carb, flooding it, and spraying gas around. dorf. I have exhaust backfire when I have heavy acceleration. Lined up the rotor to #1 yada yada. 12/02/2009. 6:1 Edelbrocker performer RPM air The problem can usually be traced to the carburetor or distributor. The backfire is caused by the leaking of air through the worn seal. There's other possibilities too but an ignition source is getting into the intake tract. It offers superior power and fuel economy performance while being incredibly easy to install and set up. Based on these findings I decided to pull the coil wire and turn the motor over. I was trying a few things today and from a ideal slowly bringing up the rpms i would guess at about 3 thousand rpms it has a steady pop I am slowly working the bugs out of a new cam and head swap. 358 Posts. Popping back through the carb. Timed by ear it runs best with advanced timing, but starts hard hot or cold, runs terribly cold, and occasionally backfires though the exhaust when under load. holley electric fuel pump,crane The exact symptom is popping through the carb when cold (choke on) and what feels like a miss. Wires are correct. My 57 seems to backfire through the carb. Detroit, Michigan. 1971 Chevy C20 2WD 350 V8 w/ stock everything but the RV cam Edelbrock 600cfm Performer carb w/ elec choke K&N Air filter Performance exhaust headers A broken valve spring or a flat lobe on the cam can both cause a popping back through the carb. 5 front and rear and the accelerator pump cams are maroon/red. In the System Parameters, the displacement My 350 SBC w/ new Vortec heads and flattop pistons, Mallory Uniilite, ceramic headers and Edelbrock 600 cfm carb on an air gap type intake is starting to pop and crack at 1500 + RPM. 350 9. Could have timing to far advanced, lifters pumping up, or a bad valve spring. Come join the discussion The Cheap rehab '79 Chevy truck is running pretty good, but still has a nagging misfire. Come join the discussion about restoration, engine C3 Tech/Performance - 81 350 sputtering, popping on acceleration - At wits end and need help from some of the engine experts here! 81 4spd with emissions stripped, edelbrock eps manifold, 1406 600cfm edelbrock carb, HEI distributor, Champion Alum Radiator with ford 2 spd fan and custom relay kit, factory exhaust Hi, I'm having problems with my freshly rebuilt 350 in my 74 Z. That's about all I can think of right now. The Mangy Using a smoke machine or carburetor cleaner you can check for a vacuum leak and repair it to fix the problem. Anyways, when I try to accelerate, it bogs down. Specifically, here we mean delayed timing, SBC 350 Engine Backfire Through Exhaust and Carb Engine & Drivetrain Register or Log In To remove these advertisements. It is a fresh rebuild with new vortec heads, Crane Cam, new lifters, primed oil pump, little gas in the carb and what I thought to be a little advance timing. e. Under load it backfires through the intake. I've tried a variety of timing settings and none make it better or worse. Model specific subject matter experts, classified ads and more. H. Jan 13, 2017 · After doing electrical tune-up (points, plugs, cap, condensor, dwell, timing) same issue. 350 chevy 101 block . he told me one engine, after it get warmed up starts to pop through the carb. I am broke now after all the changes and labor so I am on my own to get this fixed. Scott, My ignition system is a MSD 6AL. 1994 C20 350/4L60e Email Report carbking Senior Member Posts: 1567 Loc: Missouri Reg: 06-14-03. 79 kmino Discussion starter. glhx Discussion starter. A pop through the carb can be caused by timing to far advanced causing the spark to happen while the intake valve is still opened while a pop through the exhaust is the opposite, the cars timing is retarded causing the spark to happen while the exhaust valve is still opened. User Info. Also, if I adjust mixture needles for optimum vacuum, the idle shoots up and I can't get it to idle down. 5K views 8 replies 2 participants last post by Steve340 Mar 16, 2007. Chevy 350. My 70 El Camino started backfiring quite badly through the carb with a ball of flame coming out. 02/1. My engine has been backfiring through the carb, and it’s driving me nuts! Symptoms Backfiring: The engine makes loud popping noises when I try to accelerate. On the highway, it sails down the road at speed, but when the road Oct 4, 2018 · Backfire through carburetor. An Article Carb is freshly rebuilt, car will not run so I can't check the timing. The websites that have serial numbers listed dont have an i in them. Anything above idle caused some real bad popping out of the carb. One of the primary causes of an engine backfiring through the carburetor is improper ignition timing. And side exhaust. Will backfire through carb with the 750 DP occasionally too if i mash the pedal too fast. Timing Issues Ignition Timing. com: I have a 69 chevelle with a slightly modified 350. When idling, a distinctive stumble is heard and throttle response is not that great. Just pop pop pop all the way up through the rpm Three main causes for backfiring on a distributor engine. I’ve messed with the timing, advancing and retarding but it doesnt seem to help. engine popping sound (Topic#279873) FlyinRed7 Frequent Contributor Posts: 1599 Reg: 05-18-02. As soon as I snap the throttle, It Stumbles and sometimes backfires through the carb. Strange, I have a customer's 71 C10 with a 402 big block in the shop, put a reman Holley 750 dual feed vac secondary carb on it a couple weeks ago, it ran great for a little while, then it started loading up, then pushing fuel out of the front vent tube, I took the front bowl off, it had a brass float, and it was full of gas, called the people I've got a Chevy 350 that suddenly dies when at idle and when I'm in reverse or drive. 5" Pv 89 jets rear and 31# squirter MSD o 350 w/Comp Cam, Edelbrock Intake/Carb, roller cam & rockers discovered that he had two of them switched so I would absolutely go through the process and reconfirm that you have the plug wires routed correctly in the correct firing order. 1979 Chevrolet K10 350, TH350, NP-203 - Stock For Now. 9. A recent compression test and plug analysis reveals that the bottom The carburetor regulates the flow of fuel and air to an engine. 05-07-2021, 11:13 AM. Timing at 12. I can't pin down the cause. It takes alot to get the rpms up and seems to lose power about 4500 rpm. But she runs so much smoother! I have a 350 4 bolt that sat up for a few years and I have been trying to get it back on the road past few months. Now when trying to start it backfires through the carb something terrible. I recently replaced my distributor and carb and made sure to find top dead center before I set my timing. 558, and advertised duration of 292/300 Second, If you can still get it to run/idle, disable plug wires one at a time to see if you can make the backfires stop. 60 valves, dual plane intake, holley 750, HEI ignition (Summit Racing brand) cam is a hydraulic roller on the high side of mild, new plugs. Running fine, then backfiring through the carb and got far worse within 100 miles On a stock 350 with a new 1906 ASV, had a backfire through the carb while pressing gas pedal. So I used a '34-'35 carburetor with a #94 main jet substituted in and the engine ran great with that, I have a 1960 chevy truck - the engine says its a 350 but I could swear the guy said it was a 305. Jump to Latest 14K views 4 replies 3 participants last post by DoubleVision Jul 8, 2010. It probably is too rich to First, go back to basics and recheck for proper firing order, Again, and again until you're sick of doing it. $208. 350, 600 Edelbrock, Standard dist with Petronics HEI module. When the spark plug fires too early or too late, it disrupts the engine’s combustion hi everyone, hows it going. 60,vortec weiand polished intake,demon carb Popping through the exhaust is generally a rich condition. So. A recent compression test and plug analysis reveals that the bottom Trav, Running open headers, hooker super comps. Checked the old distributor and the shaft had some play in it Vehicle is a 1993 Chevy Silverado with the 350 engine. Running fine, then backfiring through the carb and got far worse within 100 miles supercharrger backfire through carbs The dual accelerator pumps in the carbs are 50s. With an 73 - 87 Chevy & GMC Trucks. Issue resolved. It makes the sound both when the engine is cold and hot. Bill Tichenor. I wouldn't mess with the timing untill you find where TDC really is. It could be the cam is shot might Since all of the issues started I have replaced my wires, plugs, fuel filter, distributor cap, carburetor. It is more pronounced when I manually open the secondary throttle plates. hold 18psi vacuum. Only 7 left in stock - order soon. Carb seems to be functioning Glad to hear that the carburetor is working beautifully. I hooked up a compression hose to number one and waited for the exhaust push of air (TDC) then proceeded to place dist in correctly. 3L 2005 HD VRSCA V-rod Email Report alaskan155 . It can also be caused by mal adjusted carburetor. Introduction I’ve been having a frustrating issue with my small block Chevy lately, and I’m hoping some fellow gearheads can help me troubleshoot. If its backfiring thru the carb, its a good bet that its sparking with an intake valve open. TH-350 - 3. :gba: Served with the 11th Armored Cavalry Regiment, Fulda, Germany, 101st Airborne Division Fort Campbell, KY, 8th US Army ROK, Fort Polk, LA, 9th Infantry 350 popping at full throttle. It ran fantastic at idle and revved good without popping back through the carb. a screamin 355. labwork 4MV 4 Barrel Carburetor Replacement for Hi I’m new to working on cars and was wondering if anyone could tell me why my Chevy 350 is backfiring though the carburetor. If its popping in the exhaust, Chevy Forums FREE technical assistance for your restoration and repair. Items I checked Immediately: - Pulled all Plugs and turned over motor – No noise or back firing heard - Checked Compression on All Cylinders Left Bank: #1 – 145lbs, #3 – 145lbs, #5 – 150lbs, #7 - 142lbs Using a smoke machine or carburetor cleaner you can check for a vacuum leak and repair it to fix the problem. Someone else left the rotators on with a performance cam and got 68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI Low or retarded timing will cause an engine to spit back through the carb. 350 chevy - bored . 1956, and 1957 Chevy owners and enthusiasts. They You will get more expert advice than I can give but here is my understanding of things. The tare down to see the lifters and cam to make sure what is wr Diagnosing the 454 BBC from the 52 This makes sure that the spark plug ignites the fuel at the best time. So I pulled the carb, disassembled it and blew carb cleaner and compressed air through all orifices. It doesn't seem to have the power it should either and I think it is running too lean. Chevy Forums FREE technical assistance for your restoration and Backfire Through Carb (Topic#243117) RPM_WG Member Posts: 89 Loc: Houston, Texas Reg: 03-15-04. I forgot to mention, that when the engine is warmed up, it doesn't do it. The 350 was My 350 Chevy pops out the tailpipe at wide open throttle. It has ported 882 heads that are freshly decked with new valve guides, valves and I am not sure I understand exactly when the eng is popping out the exhaust. Once I put it This popping heard from the carb is concerning. 02-1. I am assuming it is popping all the time, an exhaust backfire is usually ign related. Did the engine rebuild and all in between. author. I had driven about 25 miles at 60-65 mph when I heard a minor pop coming back through the carburetor. E Pa Reg: 03-12-03. Send Private Topic View Profile. kit and trans pack. How would I determine if the lobe was bad? The motor has maybe 150 miles on it. 1967 LWB Chevy. Thankfully, because both of these components are on top of Chevrolet's 350 small-block engine, checking them is quite easy. transition circuit clear up to a little past 2000 rpm and around 40mph before the mains will start to kick in and going through town driving in Soon to be a 350 Dart shp small chevy build, Holley custom modified vacuum secondary carb, Dart pro1 200cc platinum aluminum heads, ported and bowl blended and gasket matched to the intake, Edelbrock performer rpm air gap intake, 268/272 220/224@50 510/510 lift 114 lsa custom hydraulic roller cam, Hei distributor with performance coil and Probably way to lean. carburetor tuning and adjustments. im almost possitive ive got timing right on ive done this job alot in the past but never had such a issue. I did however get new distributor for the thing and installed that. Popping noises from a carburetor indicate will the car run or just backfire through the carb? if it's been out, it may be 180 out, that will back fire be sure the number one wire has the rotor pointed to it on top dead center of number one cylinder if it backfires through I cant seem to get rid of the popping out the exhaust on deceleration. When I crank it over, it Chevy 350 popping through TBI carb and making a knocking noise when warm. Visit the new site I am still having a problem with backfiring through the carb which I have never had in the 5 years I have the car. 2 diesel in a 84 4x4 . 06-02-10 06:52 PM - Post# 1924486 I have a SBC 350 with a Edelbrock performer 600cfm carb, and I get intermitent backfire, sometimes Timing Issues Ignition Timing. Many modern vehicles have eliminated carburetors in favor of direct fuel injection controlled by a computer. I still have one small issue. This causes a lean mixture in the carburetor, which can heres a video of the problem can anyone tell me why its doing that? its got a 454 bb, holley 750 carb. Popping through exhaust, now it got worse. The most common cause is an ignition timing issue, which. that fuel explosively burns and creates a loud popping sound. 73 gears,new bearings,seals,and gears. Home; This can happen if your car’s oxygen So here is my setup, 350, vortec heads #062 casting with 2. 40 bore,2. Initial timing set to 12° BTDC in and of itself won't cause exhaust popping. Once the engine warms up after you have been driving for a few minutes it runs fine, no 1973 Chevy C20 with 350. edelbrock performer with a 625 demon carb. I pulled the plugs and they are darker than they should be Popping sound thru the carburetor!! The 1967 - 1972 Chevrolet & GMC Pickups Message Board Register or Log In To remove these Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board: Popping sound thru the carburetor!! Web 67-72chevytrucks. it has tried to start but has not fired. 99 $ 208. 1. Have a lot of popping and bad backfiring thru carb. :moddhappychevelle22 1956 Chevy 2 door Sedan 210. 283 w/Edelbrock 600c carb. 1973 Chevy C20 with 350. im pretty new on here. Add to cart -Remove. My gas mileage has dropped from 18-19 to 16-17. heres the problem it starts good idels good takes gas good UNTILL you get out on the street then when you give it gas it pops through the carbarator im at a loss i have re adjusted the valves The exploding mixture then vents through the carburetor. 454 popping through carb ??? Jump to Latest 14K views It sounds like a lean backfire coming through the carb. It cranks right up and idles fine, but once I press down on the gas it backfires through the carb. under load. When there's an issue with this, it can be the cause of a backfire in a carburetor when accelerating. Timed to spec it runs like total crap when under load, and backfires through the TBI. This motor was swapped in after a 6. A rhythmic popping sound which is not as prominent as lean under power Ok so I have a el camino with a 350 2 bbl carb HEI dist and I have recently put on new headers and true duals on it and it has a popping from the Log in or Sign up. You may want to go through the carb and check out the jet and rod Troubleshooting - backfire through carburetor. new Holley 670 street avenger carb, Mallory 6a ignition control, MSD 8572 dizzy, MSD blaster 3 coil (new). th350 with a At 14* the engine would pop on all quick throttle applications. 31 Posi Factory PW, PDB, AM/FM, A/C & More if its a small block or big block chevy the firing order is 1-8-4-3-6-5-7-2 If you bring the timing mark When you purchase through links on our site, we may earn an I'm pretty baffled here and I really feel like I'm running in circles here. I am having problems with the motor popping through the exhaust. Not good but without modifying the distributor that is where we set it. When that extra gas is not available you will get a hesitation, or bogging. . 60 327 camel hump 64cc heads,crane roller rockers,edelbrock performer carb,edelbrock torker 2 intake,b&m 3000 stahl converter,th400 trans w/b&m perf. I backed the timing off to 8* at idle which limited his Total to 28*. I have rechecked the timing and it is where I last left it (thank goodness!) at 16 degrees initial and max advance at 38 degrees all in hi everyone, hows it going. If the ignition timing is off, it still popping The small block is a target master 350 stock with headers carter afb comp carb 625cfm electric choke, electronic dist performer manifold. 10 bolt rear end w/ 3. There is no A wiped out exhaust lobe on the camshaft will absolutely cause popping out of the carburetor. Joined: Dec 5, 2008 Posts: 1,087. Have tried readjusting the Popping through carburetor I'M STUMPED Hello every one im new here Today. Changed the spark plug WIRES. Jump to Latest 4. 0 out of 5 stars. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts backfiring/popping thru carb constantly #898716 10/09/11 07:16 PM. Seems to be mostly on the left bank. Atomic Industries The Jalopy Journal Technical Help 350 chevy popping in exhaust. 5k, and thus doesn't produce the power it should. The motor only does it when it is idling for alittle while or really slow speeds. Skip to content. The cam is a Crane hydraulic roller part number 119661 grind HR-230/359-2s-12. When Holley 670 cfm street avenger carb w/ Vac Sec. i'm a new member and have a question for you engine guys out there. 10 deg BTDC -still backfiring I have a edelbrock 1406 carburetor that's backfiring through the carburetor on the initial drive of the day when the engine is cold. I've also put on an Edelbrock 750cfm today, and it still pops, same RPM's. It has TBI. A rhythmic popping sound which is not as prominent as lean under power Generally, exhaust popping represents either an ignition misfire or a mechanically compromised cylinder (i. albans, vermont Reg: 11-05-08. The carb has been running rich it seemed lately as there is a lot of carbon coming out of the tail pipe. Still runs like crap. Aside from the backfiring effect through the So I used a '34-'35 carburetor with a #94 main jet substituted in and the engine ran great with that, except for the occasional misfire at idle. to distributer Finn210 this is the guy with the overheating 57 Chevy happy Thanks Giving! Well when the shop installedl and broke in the new 350 they did have issues with setting the rockers. Now getting a backfire through the carb (seems to always be the one over the 5/7 I finally got it back together and running a couple weeks ago. 539/. FREE delivery Wed, Aug 28 . I have relatively new carburetor (demon 650), new HEI distributor, wires, plugs. The engine throws black smoke on startup. My 350's started doing some backfiring through the carb the past week. 7. Once it warms up it seems My dad has a 1972 El Camino with 350 CI engine and 4B Carb. I just redid the intake manifold gaskets and it fired right up, idles good, but when i put it in gear and give it gas it just backfires and dies. , stock exhaust. Check 5 & 7. from Hi I’m new to working on cars and was wondering if anyone could tell me why my Chevy 350 is backfiring though the carburetor. Footage taken from Holley Carburetor Installation & Tuning DVD 4- hard starting, backfire thru carb is to much advance or valve not shutting on intake. Gen1 350 with an Edelbrock Performer manifold and 1405 carb Mild Crane Blazer cam, Keith Black pistons, fuelie heads. Basicly, I have limited power, off idle stumble, and a slight pop out of the exhaust when shifting. Older vehicles with carburetors require maintenance and cleaning to keep fuel and air flowing correctly. You may also hear a popping or backfire through the carburetor. 99. 3k-3. I'm pretty sure the timing is off on my 454 but is this the only possible cause of this? (350 rocket) 1972 Oldsmobile cutlass convertible(455) 1973 Chevrolet Camaro (383) When you purchase through links on our site, we may earn an affiliate commission, which I put a timing light on got the timing anywhere between 0 degrees And 10 degrees advanced . Popping noises from a carburetor indicate Popping through the carb would make me think that an intake valve is out of adjustment, bent or burnt allowing compression back into the intake. Is it under heavy load or just under normal driving. Starts and idles fine. Author Topic: Carb backfire and Timing mark off 79 Chevy 350 (Read 26278 times) jcjoggerst. 1965 Chevy Bagged,361 sbc,voodoo cam,1. Very easy to take apart and clean out with compressed air. The most common cause is an ignition timing issue. So now the carburetor is back to all the original settings I had, and I put the other springs back in the distributor. It has a harsh, choppy idle. (Topic#96947) Chevymark454 Member Posts: 28 Loc: MA Reg: 05-14-04. It has been giving me so much trouble backfiring through the carb. 04-18-12 01:19 PM - Post# 2216575 My 350 SBC w/ new Vortec heads When you hear a backfire, you need to determine whether it is backfiring out the exhaust or back up through the carb. The Vacuum reading is 12 at idle and max's out at 19. It transformed the car into something that was incredibly smooth, and joyful to drive. 1978 chevy 350. Hooked everything up and tried cranking it over. 5 full roller rockers,patriot 185cc vortec heads 2. I’ve never heard such a thing and having a hard time finding answers. I plan on tearing the carb apart to check everything. I built the car Have a lot of popping and bad backfiring thru carb. Acted as a capacitor, which Apr 23, 2004 · small block chevy, popping thru carb. 1974 Chevy El Camino Classic 350 1976 Pontiac Trans Am 455 The valve opening/closing events take place at different times. This is most likely due to to much air, or not enough fuel. Re: chevy 1500 backfire not hard at all just takes 2 ppl remove the dist cap with a socket on a breaker bar connected to the crank shaft front bolt turn it backwards a little when the second guy sees the rotor turn you can stop mark the balancer with a reference point on the timing mark now turn it back the other way slowly and when the other guy sees the rotor 1988 chevy k1500 TBI 350. This motor is in a 1979 nova and ran well before. Hope somebody can help!Just rebuilt a 1972 chevy 350 with a new crankshaft,edelbrock torquer plus cam,torker manifold,holley carb, summit 1. I have put about 125 miles on it and had no problems with it at all until yesterday afternoon. Checked firing order, OK. Joined: Jul 2007. Chevy Forums FREE technical assistance for your restoration and repair. -timing is 18btc(doesnt improve when altered)-dwell is 31-ive sprayed carb cleaner around possible vac leaks (no dice)-no exhaust leak-ive richened the idle mix screw and leaned it (no better)-carbs are synched (idles bout 700, idle speed screws are all the way out The Cheap rehab '79 Chevy truck is running pretty good, but still has a nagging misfire. It runs real smooth at idle, and if I slowly rev it everything is fine. 600 cfm carburetor on top of a 1" spacer. Sounds like a machine gun. When I try to start it, fuel spits up through the carb when the motor tries to hit. Not uncommon on 350 sbc . Posts: 684. 720 degrees in 4 cycles, 360 out is half way through. hooker super comp headers w/edelbrock mufflers. Backfiring through the carb means an intake valve is partialy open. The problem I am having is it is popping on deceleration chevy 350 backfires out intake. SHARE POST #4. Newbie; Only other time backfire/ popping through the carb is if the dist. 600 cfm versus the 480 cfm seems to make a huge difference. Pull the valve covers off and run the engine, All the rockers should have a good amount of travel, Lastly, when a valve seal is worn, it can cause a backfire when accelerating with the carburetor. A couple of years ago I decided to try a '39-'40 carburetor to take advantage of the 4-screw float bowl cover that eliminates the leaks of the 2-screw cover and other improvements. Aug 16, 2013 · I was also told that I was running way too much carburetor for the stock engine. I have been searching through back postings about the backfiring through the exhaust and have tried some of the fixes but still backfiring. Sometimes pops through the intake. G. The '36 engine did popping through exhaust. A lean condition will Based on these findings I decided to pull the coil wire and turn the motor over. i recently went out fishing on my cousins boat which is powered by two chevy smallblocks. 186 bowl ported heads. I got the same popping noise through carb. 27 posts · Joined 2005 Add to quote; Only show this user #1 · Mar 15, 2007. The carburetor delivers the air/fuel mixture to the engine, and the distributor ignites that mixture within the cylinders. Used thumb in #spark plug hole found tdc in compression stroke. Right know it backfires like crazy out the exhaust. 5 ) Yesterday i set the timing to 16 initial / 34 total. It is definately popping through the carb when you give it throttle. 78 formula orig. 1980 K10 350/350 2005 Z71 extended cab 5. It has 56000 miles, and the car rarely gets driven. I can't figure out what's happening with my sbc 350. The symptoms were always the same. 5 to 1, mild cam, camel hump heads, performer intake, holley 750. If your Chevy 350 is popping through the exhaust at idle, it could be due to a few different things. Thread starter Casey Shoemaker; I have a 350 4 bolt that sat up for a few years and I have been trying to get it back on the road past few months. It could be extremely lean too. 72 Malibu 454/TH400 1974 Chevy El Camino Classic 350 or if he installed Diagnosing the 454 BBC from the 52 rat rod for a backfire through the carburetor under load. Second, check for enough fuel going into the beast. comp 268H cam. Are you Sometimes popping on decel is caused from an exhaust leak. Save Share Reply Quote Like. 406 SBC, 6-speed manual, mild cam, about 450 HP or so. 69 Jets front 6. Member. 5. While parked the car idles well and has good throttle response with no misses or backfires. I’ve messed with the timing, advancing and retarding but it doesnt seem o 350 w/Comp Cam, Edelbrock Intake/Carb, roller cam & rockers o Started missing a month ago but starts right up and runs 'OK' for 7 o Checked - Static compression: 155 lbs cold - Rockers operate normally when engine turns - Spark tested visually & on test console Basically what it says. Mallory Unilite distributor, MSD Blaster 2 coil, new Tailor 8mm spiral wires, new plugs. When the spark plug fires too early or too late, it disrupts the engine’s combustion Chevy Forums FREE technical assistance for your restoration and repair. Chevy by Choice. The original 283 engine in my 57 was rebuilt by the previous owner. I put everything back to normal. Replaced distributor and problem went away. something is wrong, just dont know where to start. Sort by Oldest first Oldest first Newest first Most reactions. 080 over, 10. video. My engine (235) is consistently making a popping sound heard through the exhaust at idle speed. REPETITIVE BACK FIRE. Backfiring Through Carb (Topic#216044) Zman57 Member Posts: 45 Loc: N. Help me OP. The car prior to the carb being rebuilt was running rich and after the rebuild seemed better but then starting running rich again. Tech Support said they thought the issue was the boot on the end of the accelerator pump had come loose, this The carburetor regulates the flow of fuel and air to an engine. Send Private Topic however when I turn the Tuning Help 350 SBC Carb/Timing Stumble problem. if i disconnect the power wire from batt. but anyway ive been having a issue getting my 350 to run. As soon as I put the car into drive and attempt to accelerate, I get a nasty backfire through the Every once in a while when driving I'll get a backfire through the carburetor. 8 to 1 com. Joined Aug 2, 2017 Posts 1,837 Reaction score 915 Location Euless, Texas First May 4, 2015 · C3 Tech/Performance - 81 350 sputtering, popping on acceleration - At wits end and need help from some of the engine experts here! 81 4spd with emissions stripped, edelbrock eps manifold, 1406 600cfm edelbrock carb, HEI distributor, Champion Alum Radiator with ford 2 spd fan and custom relay kit, factory exhaust Aug 10, 2023 · The Edelbrock 1406 600 CFM Performer 4 Barrel Carburetor is the best option for a Chevy 350. everything else stock. /TH 350/12 bolt 410 Gears Original owner A OK I am almost finished with the project. Replaced plugs (delco r45ts, gapped at 40), plug wires (delco 908w), distro cap (delco d308r), rotor (delco c435), pcv valve (standard v178). Improper carburetor adjustments or vacuum leaks can cause this condition. Would pop The Edelbrock 1406 600 CFM Performer 4 Barrel Carburetor is the best option for a Chevy 350. I followed directions for a chevy 350. I think I'll check the plug wires tomorrow. Footage taken from Holley Carburetor Installation & Tuning DVD Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks. 4 Barrel Carburetor for Chevy 350, Rochester Quadrajet Carburetor 4MV 1904R 1906R Carb Fit for GM Chevrolet Cadillac with 305-350c. I checked for vacuum leaks with WD40 and found none. tommy, Apr 22, 2009. Please help! 350 . Also replaced (but surely unrelated) valve covers and valve cover gaskets, master cylinder, pump to carb fuel line and filter, oil and oil filter. Under WOT, it is far less prone to the popping, but seems down on power, and seems to struggle to pull through the C1 & C2 Corvettes - 1967 427/400 Popping through Side Pipes on Deceleration - Working on a 1967 Corvette 427/400 with T. By chatting and providing personal info, you understand and agree to Customer: Chevy 350 poping through TBI carb and making a knocking noise when warm. Why I think it could be the cam- back in the 80's every 327, 307, 350, 305 we knew of or touched ate a cam. Please give ideas after you read what I've. Also seems to be straining the starter and starting weird. Items I checked Immediately: - Pulled all Plugs and turned over Popping through the carb is usually a lean condition or improper timing. Now to my next chore. When distributors are not tightened properly the dist will retard itself and cause a backfire. Now I checked timing twice and I even used a different distributor to eleminate vacuum advance. 4604 posts · Joined C3 Tech/Performance - Backfiring through carb - I have a 1977 vette that I inherited from my uncle. Vacuum advance. It could be reversed. It could have simply been the wrong carburetor for my application. Not all the reasons, but the biggest ones. I took the car around the block the other day with the mufflers back on it, and I noticed a low rpm (about 1500-3000rpm) miss or backfire (very subtle, not loud in any way) but when I floored it, there is no miss or backfire, and when I let off I didn't notice any popping. Discussion in 'The Hokey Ass Message Board' started by Archer775, Aug 18, 2014. I blew out my fuel lines to make sure they are not clogged. choke 65 pri and 68 sec using 'middle Tried to start the new motor for first time today. It idles smoothly and revs fine in park. 73 Chevy 350 09-19-02 03:35 PM - Post# 23311 Finally fixed my over heating problem. I would first try re-tightening all the exhaust manifold bolts. Check the following, in order: Make sure you are timing off of the #1 (driver-side front) cylinder. It started when i took Helltrix for a ride a few days ago. Poor Performance: It feels like I’m losing power, especially on Generally, exhaust popping represents either an ignition misfire or a mechanically compromised cylinder (i. 6 ratio rocker arms,HEI distributor. , very low compression). One of the carbon "wires" had an air gap in the carbon. Im not sure if it's backfiring through the carburetor. About two years ago I purchased the four injector Sniper for my '86 Cutlass. It Basicly, I have limited power, off idle stumble, and a slight pop out of the exhaust when shifting. 350 sb, Chevy 350 Popping Sound I’ve had this car for a long time. Low rise single plane Holley Truck avenger 670 cfm carb. Usually an ignition problem or miss will be heard in the tail pipe. 90-IG with 112 degrees of lobe separation, lift of . if the exhaust valve doesn't open enough- the combustion will stay in cylinder and escape back through intake manifold as the intake valve opens. I'll pop the distributor cap off and see if my virgin eyes can see anything afoul. Hey guys, I just installed a cam and set of heads on a 350. With an  · Chevy Forums FREE technical assistance for your restoration and repair. 359 posts · Joined 2008 Add to quote; Only show this user #1 · May 14, 2010. 5 psi constant. Thought I had it, but alas seems to change its mind if I look at it funny. I have a brand new 670 Holley street avenger carb that has been on motor for about maybe a year. How am I able to see if Under part-throttle acceleration, the engine will pop/crackle out of the exhaust. Oct 23, 2012 · My dad has a 1972 El Camino with 350 CI engine and 4B Carb. Thought it might be 180 off so I spun it, it was really no different. What I read seems to indicate timing issue. it seems to poof or puff or backfire out the carb when i give it gas. Thanks! Oh and if you are not on the MS gulf coast this week you should be! When you purchase through links on our C1 & C2 Corvettes - 1967 427/400 Popping through Side Pipes on Deceleration - Working on a 1967 Corvette 427/400 with T. ). 283 popping thru carb (Topic#213628) reddon1957 Contributor Posts: 158 Loc: st. While the electrical system Second, If you can still get it to run/idle, disable plug wires one at a time to see if you can make the backfires stop. It had been sitting for several years, but I have been working on it, and I have gotten it up and running. Recently, it has developed a loud banging noise in the engine similar to the sound of a backfire. 030" over 11:1 compression L98 Aluminum heads 58cc Edelbrock Streetmaster intake. The problem I am having is it is popping on deceleration Trav, Running open headers, hooker super comps. Profile Page. is 180 out, but would be accompanied by fire. Did you run a zddp additive and the proper oil during break in? How exactly did you break it in? OK, so having a bear trying to get the SBC running smooth. It pops through the carb starting at aprox. The power valves are 4. Alright so I have a 1984 350 engine with headers, edlebrock performer intake and edlebrock 650 thunder series carb. what causes this. to distributer A lean condition can cause some of the issues you are having. Either way I adjust it between, the engine seems to be idling fine but will randomly pop through the carb, especially if I get on the throttle. 11:1 TR406sbc/AFR227/Comp cam 280HFT/3500 RPM Stall conv. 1940 chevy truck has a sbc 350 pulled from a 70 Chevelle. we went out fishing and after about 35 minutes running at about 3000 rpm Jul 27, 2020 · Under WOT, it is far less prone to the popping, but seems down on power, and seems to struggle to pull through the RPM band, though it gets there eventually. Since then every time i try to start it Why Does My Chevy 350 Backfire Through the Carb? If your Chevy 350 is backfiring through the carb, there are a few possible causes. When I smash on the gas my engine makes a popping noise. I. The exact symptom is popping through the carb when cold (choke on) and what feels like a miss. I have a 350 chevy ina 1967 camaro rebuilt from top to bottom. ehuyqfh ibq bnmm gjwayp jwxg noyv keiznp uuht qfq ywnuhi