4.3 Tbi Backfire Through Intake Systems

Tuesday, 30 July 2024

If the RPM is too high, the idle circuit will be bypassed. A severely worn exhaust cam lobe or exhaust valve lifter can causing a "popping" in the intake If we're talking exhaust, we have the same, only burnt exhaust, incorrect valve timing, or severely retarded timing.. Sensor, and I spent a few hours replacing shoddy wire connections as per my mechanics recommendations. Truck will not take a load at all - sputters, misses... 11-24-2008, 08:50 PM. Crank sensor or ignition control module. Chevy 4.3 vortec, diagnosing backfire through intake. Injector spray pattern appears normal, and no fuel is sprayed if I disconnect the electrical connector and crank it. June 11th, 2007 10:44 AM.

4.3 Tbi Backfire Through Intake Motor

Pump should run 2 seconds (20 seconds on models with fuel module). Unanswered Questions. The truck started developing some major driveability issues that were getting worst and worst to the point that it would take a little bit of cranking to get it started and would idle like a bag of ****. From a roll if i mash down it will downshift and rev high but again no power. As far as I know there aren't any wires or anything back where I sprayed the water. Have you checked the cap and rotor. When a lean mixture combusts, it burns more slowly, meaning there will still be some air and fuel that isn't used up when the exhaust valves open -- leading to a backfire. 99 chevy k3500 454 auto 185000 miles misses under a load at 2000rpm new wires, cap rotor, cam and crank sensor, 60psi fuel pressure, compression ok, intake gaskets done 2years ago or 10, 000 miles, has dual fuel tanks -front tank fuel pump replaced 1 year ago used 3m injection cleaner on a regulator still misses, popets bad or what? 4.3 tbi backfire through intake pump. 4 wrz 2021... Just another Chevy truck, just another Not so fast! With the engine cranking over all 6 poppet nozzles are spraying. I just noticed it a few weeks ago when I have it running and the air cleaner off.

How To Time A 4.3 Tbi

Sounds like the timing is retarded. But when the engine heats up to anywhere near normal, it starts missing and bucking under load, no codes. I buttoned the engine back up and decided to check the wires, cap, and rotor. If it doesn't, and you find no other issues such as fuel starvation or exhaust restrictions, your camshaft could be excessively 20, 2010 · mark9207 June 20, 2010, 3:26am #4 Your timing should be set around 8 degrees BTDC at idle with the vacuum advance disconnected and plugged. I guess it's the coil first. It stumbles then clears up then back to stumbling. Keep reading to find out more about these problems and ways to fix them. It feels starved for fuel. Also, going more than about 4 causes it to misfire a little at idle, and around 8-10 I start seeing a few knock counts (but it does feel more powerful on the butt dyno), so I set it back to 0. 1994 Chevy S-10 Backfires Through Exhaust: Just Replaced the. Well anyways did a tune up about a year ago and it runs fine but seems a little slow for a standard cab short bed 2wd.

4.3 Tbi Backfire Through Intake Manifolds

Code 12 is normal with key on and engine not running. Its got 1980ish 454 motor. Haven't found any threads on my particular problem but if there is one already, I apologize in advance. Well with 20 miles on new motor i bet you have some partially fouled plugs. Join Date: Aug 2003. As in never had the valve covers or intake manifold off. How could the timing have gotten off in the time that the junkyard pulled the engine and I put the harness on it and started it up?? Chevy C/K Truck Forum. You will need to clear the service engine soon light before driving it. I didnt rotate the distributor at all so timing is dead on and firing order is good (1-6-5-4-3-2). Backfiring with flame through throttle body. 3s did the same thing, a reman distributor fixed both., BUT they both fired briefly when some fuel was squirted into the throttle body. If it sneezes, you may loose some facial hair.

4.3 Tbi Backfire Through Intake Fan

AutoZone said: they were good. Pay close attention to the fuel spray. Almost seems as though its not getting enough fuel. It's got a two barrel carb and, I think, the stock 307 manifold that this car came with originally. I tested compression at 170-180 on all cylinders. I built an ALDL link cable and have taken readings/logs with WinALDL; everything is normal except the block learn mode table which does show some enrichment being done -- values are around 115-120 and apparently 128 is the perfect mixture. Check that first and see if it helps. Happened first about a month after taking out of storage, threw "P0300 random misfire", gas was almost a year old so I added another quarter tank of premium, pulled plugs and noticed rust on boot portion of plug 1... sims 4 step siblings mod chevy 454 no power under load So people who believe in the Law of Attraction are people who are fully 100% accountable for their lives. So I guess my questions are what should the resistance reading be on the throttle body injectors? Stock 210hp 350 V8 up to 250hp the stock 55lb 350 truck injectors at the factory 11-12psi is fine. 4.3 tbi backfire through intake manifold. What would also cause the Exhaust to get cheery red with no cat or muffler on it. A "lean" mixture is one that doesn't have enough fuel, and too much air. The air cleaner being off will really throw the AE (accel enrichment) tune out of whack on a TBI.

Car: 92 Form, 91 Z28, 89 GTA, 86 Z28. PENGZHOU LS Conversion Engine Mounts 1973-1987 Square Body- Universal Swap Bracket Small Block Adjustable for LS1 Swap 88-98 GM Truck RAW 1500 2WD. 4.3 tbi backfire through intake motor. It runs great, slight surge sometimes at idle and like I said when cruising. 3 W and X engines, but usually you lose 1 or maybe 2 cylinders. I'll pull codes again and see what i can find. Save Reply Quote An exhaust tail pipe backfire is caused by an excessive amount of un-burnt fuel remaining in the exhaust system or fresh air being allowed to enter the system which ignites a small amount of … brandi canterbury born behind bars update 2022 2, 868 Posts.