Truck will only crank if given gas if you stop given it has it goes dead

Asked by Apr 02, 2017 at 01:28 PM about the 1999 Chevrolet Silverado 1500 3 Dr STD Extended Cab LB

Question type: Maintenance & Repair

Have replaced the fuel pump,fuel filter,plugs,and
check the mass air flow anyone have any idea
what might cause it to do this ???

1 Answer

76,335

Probably the spider injection. A fuel pressure test would need to be done by hooking up a fuel pressure gauge to the Schrader Valve, building up the fuel pressure, should be 56 to 63 lbs, and then with the key off let it sit. Watch the fuel pressure gauge, it should not drop more than 5 lbs. in three minutes. Otherwise if the check engine light has ben on then it is a possible Throttle Positioning Sensor. The vehicle would need to be scanned for trouble codes to verify.

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