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

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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

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

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