1993 Chevy 1500 with 5.7 is dumping fuel at idle

Stumped

1993 Chevy 1500 with 5.7 is dumping fuel at idle

Unread post by Stumped » Thu Dec 17, 2009 12:56 pm

We have a 1993 Chevy C1500 with a 5.7 that is dumping fuel at idle. We've put new injectors in it, new map sensor, O2 sensor, air control sensor, temp. sensor, new computer & chip, EGR sensor, Pickup in distributer, new distributer wires, new cam, lifters, timing chain & gears, fuel pump,& top end of throttle body. We've taken it to Sands Chevrolet & Gateway Chevrolet and nobody can find the problem.

Guest

Re: 1993 Chevy 1500 with 5.7 is dumping fuel at idle

Unread post by Guest » Thu Dec 17, 2009 7:52 pm

Sounds like a grounded wire for the injector circuits.
PCM controls the ground. If the ground circuit is shorted out somewhere, that would cause the injectors to be open all the time.

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TerryAuto
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Re: 1993 Chevy 1500 with 5.7 is dumping fuel at idle

Unread post by TerryAuto » Tue Feb 05, 2013 10:02 pm

Disconnect the ground wire at the injectors and the ECM. Test that wire for being shiorted to ground. If it is not, then the ECM is bad.

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