Occasionally stalls

RONBELIFORE

MEMBER
1989 CHEVROLET 3500
V8
2WD
AUTOMATIC
115,000 MILES

The truck starts fine idles high. When I give it gas it may stall and shake resulting in no power steering or brakes, if I drive down the road it will clear up. It also uses a lot of gas.

Wednesday, February 16th, 2022 AT 2:28 AM

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi,

It sounds like either you have a large vacuum leak, or the fuel pressure is too high. Have you ever noticed any black or gray smoke from the exhaust?

Do me a favor. I need you to check for diagnostic trouble codes. The truck has an OBD1 system and doesn't require a scanner to retrieve codes. All you will need is a short jumper wire or even a paper clip. Here is a link showing how it's done:

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Try that and let me know what you find. Also, please confirm the engine size. There are several different V8 engines that were offered.

Take care and I'll watch for your reply.

Joe

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Wednesday, February 16th, 2022 AT 5:33 PM

RONBELIFORE

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4 POSTS

The engine size is 5.7L. I believe it is black smoke.

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Thursday, February 17th, 2022 AT 2:27 AM

RONBELIFORE

MEMBER
4 POSTS

I did not try the code yet, will do today.

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Thursday, February 17th, 2022 AT 2:28 AM

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Hi,

Let me know if you get codes. The black smoke is an indication of too much fuel. It could be the fuel pressure regulator, a faulty coolant temperature sensor, or even bad injectors. Let me know if there are codes.

Joe

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Thursday, February 17th, 2022 AT 2:32 PM