Question about 1996 Chevrolet C1500
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.
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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Posted on Jan 02, 2017
Trouble Code: P0300 Multiple Cylinder Misfire Detected Possible Causes: EVAP Vent Solenoid Control Circuit Malfunction 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
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
Multiple Cylinder Misfire Detected
EVAP Vent Solenoid Control Circuit Malfunction
Posted on Dec 12, 2012
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