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Engine misfiring?

Tiny
GSILVA
  • MEMBER
  • 1993 CHEVROLET CHEYENNE
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
I am still trying to solve my problem, this truck seems to have different symptoms all the time, for example, I can start it sometimes and it runs fine, and other times I start up and it feels like it's skipping. The times that I startup and it's fine I can step on the gas with no problem, the other times when the skipping comes back it feels like a misfire problem. Everything in the ignition system has been changed and still have a problem.
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Monday, November 20th, 2023 AT 11:11 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Hi,

This could be the result of a few things. For example, a partially plugged catalytic converter, an engine vacuum leak, fuel pressure out of specifications, engine compression, and the list goes on.

Do me a favor. If you haven't already, check to see if there are diagnostic trouble codes stored. This vehicle has an OBD1 system and doesn't require a scan tool. All you will need is a short jumper wire or even a paper clip. Follow the directions in this link and let me know what you find:

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

Take care,

Joe
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Monday, November 20th, 2023 AT 7:38 PM

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