1988 gmc s15, 2.8L, TBI, injectors flooding engine


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1988 gmc s15, 2.8L, TBI, injectors flooding engine

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xcop57
New User

Aug 6, 2011, 7:03 PM

Post #1 of 3 (3696 views)

1988 gmc s15, 2.8L, TBI, injectors flooding engine	Sign In

I recently bought a 1988 GMC S-15, 4wd, 2.8L, TBI, A/T. The engine is out of a 1992 model and is in good condition. The engine will run with new plugs for a short period of time before fouling the plugs. The injectors spray too much fuel at idle. I have changed the computer, ignition module, idle air control valve, Throtle position senor and rebuilt the throtle body and replaced the spark plug wires. I work in an auto parts store so I know that the '88 and '92 models use the same computer and TBI parts. Any help will be appreciated. Thanks.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Aug 7, 2011, 3:04 PM

Post #2 of 3 (3675 views)

Re: 1988 gmc s15, 2.8L, TBI, injectors flooding engine	Sign In

Do you have access to a scan tool that can read ECM datastream information? Do you see any fuel dripping out of the injectors when you cycle the pump on and off? Have you checked for vacuum leaks? A vacuum leak on a speed density system will cause the engine to run rich. Another possibility is faulty injectors. What is MAP sensor voltage reading at idle? Have you inspected the coolant temperature sensor resistance/voltage to see if it corresponds to the actual coolant temperature?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Aug 7, 2011, 3:06 PM)

xcop57
New User

Aug 7, 2011, 8:41 PM

Post #3 of 3 (3664 views)

Re: 1988 gmc s15, 2.8L, TBI, injectors flooding engine	Sign In

Thanks for your reply. Ihave checked voltage to the TPS and Idle air control valve. This model does not have a Mass Air Flow Sensor. However, the instrument cluster does not In fact I put one new one in and it sprays the same as the old ones do. All help is apprecieated.

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