Question about 1996 Chevrolet C1500

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Engine will not run for more than 5 seconds after spraying carb cleaner in throttlebody

I checked the fuel pressure the first time and it stayed around 62psi after I changed the fuel pressure regulator. But it would not run. I have fire at plugs. A mechanic told me to spray carb cleaner in throttle body to see if it would run. I did and it ran for a couple of seconds. I rechecked the fuel pressure and it would not stay up, it dropped to 5psi in about 10 seconds. I have taken the regulator out 2 times to check to see if everything was right. I made sure the upper plenum was straight and even to eliminate any vacuum type problems. Just for grins and giggles I even replaced the crank sensor. The motor is a 350 and the fuel pump is new. I have even replaced the filter.

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You either have created a leak or an injector is stuck wide open and leaking down. Hook up a fuel pressure gauge and power up the injectors one at a time and see which one is doing the fuel pressure drop.

Posted on Jan 01, 2014

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perkins48
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SOURCE: 2002 Chevy Silverado po300 po449 codes

Trouble Code: P0300

Multiple Cylinder Misfire Detected

Possible Causes:


Base engine mechanical fault that affects one or more cylindersFuel delivery component fault that affects more than 1 cylinderEVAP system problem or the EVAP canister is fuel saturatedEGR valve is stuck open or PCV system has a vacuum leakIgnition system fault (a coil) that affects more than one cylinderTSB 03-06-04-030 contains a repair procedure for this codeTSB 03-06-04-041 contains a repair procedure for this codeTrouble Code: P0449

EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:


Vent solenoid control circuit is open or shorted to groundVent solenoid control circuit is shorted to system power (B+)Vent solenoid power circuit is open (test the ENG1 fuse)Vent solenoid is damaged or has failedPCM has failed

Posted on Dec 12, 2012

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Also, try cleaning the MAF sensor and throttle bdy with spray carb cleaner.

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Best/cheapest 1st shot at fixing this would be to spray carb cleaner in the carb with the engine running.
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Almost certainly one of the above will improve/cure the problem.

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