1988 Chevy G20 will not start when warm.

Asked by Guru9WGRX6 Mar 12, 2021 at 08:42 PM about the 1988 Chevrolet G-Series

Question type: Maintenance & Repair

My 1988 Chevy G20 van with 5.7 litre TDI would not start, I have replaced fuel
pump and filter, installed rebuilt throttle body, new oil pressure switch. Engine
now starts when cold but once warm it will not start until cold or starter fluid
is sprayed into throttle body. Any ideas what do I try next. Simmie.

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oilyspill answered 3 years ago

in your first sentence, you meant tbi instead of tdi? tdi usually means turbo diesel, 5.7l engine is not a diesel. when problem is ongoing, engine cranking, can you see fuel injector spray pattern? With tbi, you should be able to see spray pattern? If no spray pattern have to check voltage and ground for fuel injector.

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Guru9WGRX6 answered 3 years ago

Thanks, Oilyspill yes you are correct it's a gas engine, I will try this.

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James answered 3 years ago

Sometimes a coolant temperature sensor that's lost its calibration will cause a no start condition on a GM. So you can check that as well. Hope that helps! Jim

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Guru9WGRX6 answered 3 years ago

I checked the injectors were pulsing fuel when engine was cold, started and let it warm up the checked when warm no fuel from the injectors. I will change the temperature sensor to see if that helps. Simmie

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Guru9WGRX6 answered 3 years ago

I finally managed to get the right temperature sensor and changed it but I still have the same problem no fuel on starting when engine is warm. Any advice on what to heck now? Simmie

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