Question about 1991 Chevrolet C1500

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Truck starts then backfires and shuts off - 1991 Chevrolet C1500

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Back firing is caused from ignition timing being off. This means that there is a spark igniting fuel when either an exhaust or intake valve is open. Check both your timing chain and also remove your distributor and check to make sure the helical gear is not excessively worn and that the pin holding the gear in place is not stripped. Also check your distributor cap,rotor, and wires for wear as this could also cause you problems.

Posted on May 26, 2010

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I got my carburetor problem fixed but now it runs for a while then starts backfiring it'll shut off let's set for a couple seconds and start right back up can anybody tell me why


That sounds like a fuel/air mixture problem.

Just to confirm .. it is a carburettor, not fuel injection?

As a general rule of thumb (with carburettors..) if it backfires through the exhaust/muffler .. the fuel mixture is too rich.

If it backfires through the carb/air filter, the mixture is too weak.

It could also be a 'sticking' float in the carb.

When an engine is cold the fuel is rich .. lots of fuel .. that's how a choke works.. However, when the engine warms up a rich mixture causes problems. The car may splutter and stall, run sluggish or cut out.

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Slow start, low rpm, backfires and shuts off


you must RUN the scanner/computer, you can have the manufacturer specification wrong.
The electronic vehicle is complicated, by that reason you can have wrong tune up, PCM+BCM+sensor+ignition coil faulty ,etc
see the diagram attached.
God bless you0e7eb1e2-a93f-40a5-94ff-e0a2565447ae.jpg

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How do you fix a 2004 Chevy Impala 3.4 engine from backfiring


If is fireing correct than look at your fuel regulator, or your catalyst

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Converter glows red and backfires


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1998 chevy venture won`t start. cranks over pops and backfires, was running great till it shut off when I was driving it. obd says no codes found


unplug the MAF sensor and see if that helps.

I assume you have spark since it is backfiring. Will it start if you use a little carb spray in the throttle body?

If it does than you have a fuel issue. Check fuel pressure. You should see more than 35 psi roughly. If there is no fuel pressure than check for power to the pump (the larger of the two grey wires at the pump). If there is power than the fuel pump would be the first thing I suspected.

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What does it mean when a truck backfires, pops losses power?


could be the coolant temp sender.the one that goes to the computer it is in the front of the intake maniflod

Jan 04, 2012 | 1993 Chevrolet K1500

1 Answer

Basically runs great...randomly shuts down while


With what you say,get the fuel filter checked.Cheapest and easiest place to start.Its on the chassis rail,back near the fuel tank.Hope this helps

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1 Answer

Galant 95 backfires and shuts down at higher rpms


check ur plug wires they might be mismatched ...joe

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