88 GMC Sub runs for 20min then dies no fuel out of injectors


Old 10-22-03, 10:42 AM
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88 GMC Sub runs for 20min then dies no fuel out of injectors

MY 88 GMC Sub. 2500 4x4 runs in the morning for 20 minutes then dies. I watch the injectors and they stop pulsing fuel which kills the engine. It wont start after that. I wait a hour and it starts right up again. I have replaced the ignition modual under the distributor cap and the fuel filter and pump in the tank. after dying again I replaced the ECM unit and it still didnt start. I have a spare TBI set up from the junk yard that I am going to install into my 76 Int. Scout II. (thats why I have a spare ECM). I am thinking it is one of the componenents on the engin itself. TPS, MAP sensor? This truck ran like a top untill now.
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Old 10-22-03, 12:34 PM
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When it won't start, do you have power at the TBI injectors? Check it with a noid light. If you don't time to track down the bad ground that is the likely cause.
Old 10-22-03, 01:50 PM
Join Date: Aug 2003
Location: Barre,Vermont
Posts: 472
also , when u lose injector spray, do u lose spark too?

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