I have a 95 gmc k2500 with a 5.7. I have spark at each plug and I can see fuel coming from the injecters spraying into the "carburator" but it still won't start. please help

Asked by Jan 18, 2017 at 08:45 PM about the 1995 GMC Sierra 2500 2 Dr K2500 SL 4WD Standard Cab LB

Question type: Maintenance & Repair

5 Answers

95

I've had the same issue in the past with my 94 k2500, those 5.7 TBI engines have some jacked up wiring, have you checked your ignition system, have you recently removed your distributor?

9,865

If you said u have spark at the plugs and fuel in the injector, try spraying quick start just to see if it will run for a bit, if it does, maybe ur fuel is contaminated. If it still doesn't run, check timing. If timing is ok, do a compression check

The truck had been running rough and then all of a sudden died. I pulled every plug wire and I have spark at each cylinder and can see fuel spraying into the " Carb" but still no fire. I too thought a timing issue but the rotor is lined up with the #1 plug wire when the #1 cylinder is at TDC. I don't know much about the ignition system. Is there a MAP sensor or something like one? And no I haven't move the distributor. Thanks

9,865

Yes, there's a MAP sensor, it's located right left of the carburetor when you remove the air filter cover. Here's a link to a video https://youtu.be/4WyILsH4_pk

86,965

Check the TBI base gasket. Mine was so deteriorated it was letting too much air threw. Also then check the fuel pressure. It should be 9 to 13 lbs. May be a week fuel pump, but the fuel regulator in the TBI need rebuilding as the spring get weak. There are repair kits for this. Other wise check the compression. May want to do that first.

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