Question about 1988 GMC S-15

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My truck is dumping too much fuel it's TBI 2.5L

This problem started with the engine just died while driving I replaced the computer,prom,distributor,coil,fuel pump,fuel pump relay,injector,fuel pressure regulator, Then found a blown fusible link repaired that which brought me here

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  • lytcandles Feb 12, 2009

    1989 GMC S-15 2.5L Fuel injector stuck wide open

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If you haven,t replaced the coolant temp sensor that would be the next steps i would try .if it is reading minus 40 degrease . it will dump the fuel.check for open in this circuit.if you have a scanner see what the temp is. _

Posted on Feb 22, 2009

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You should pull the injectors out of the engine so you do not risk hydro locking it. It should be pretty easy to see the problem at this point. now either clean or replace the ones that are spraying all the time. 

Posted on Feb 22, 2009

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The ground side of the injector is what the computer uses to open and close the injector, must be touching ground somewhere on the engine, examine the harness to the injector for any possible wear like where it runs over the engine, the shorted link tells me you have have damage to the wiring harness for the fuel injection somewhere, and that is always on the engine, why because the engine moves around and causes the harness to rub on the engine parts, have seen this issue dozens's of times.

Posted on Feb 12, 2009

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Hi and welcome to FixYa,

Test the wires leading to the injectors. One would be +12 when IGN switch is turned ON/RUN, the other should be pulsating when engine is cranked/running. If this other wire is not pulsating and/or reading 0 volts, then the computer would need looking into. To perform the test, a test light or DVM/VOM would be needed. If this is the case, then initially check for any loose connection including the ground wire/strap in the computer harness/area.

Good luck and thank you for using FixYa.

Posted on Feb 12, 2009

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If it were carburated id say the floats are stuck with injectors im not real sure why

Posted on Feb 12, 2009

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