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Engine revs up to 2,500-3,000 RPMs?

Tiny
ROB1986
  • MEMBER
  • 1986 FORD MUSTANG
  • 5.0L
  • V8
  • 2WD
  • MANUAL
  • 94,000 MILES
Changed the idle air control valve with a new one, still on start up the car will rev up out of nowhere to like 2,500-3,000 and it revs up while even driving it sometimes, on startup if it does it I will turn the car off and restart it and everything's fine?
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Wednesday, June 14th, 2023 AT 5:49 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
It sounds like the PCM is bad or you have a bad ground somewhere. We should run the codes though to see what comes up. Here is a guide that will help, and I have included how to change the PCM out in case you need it:

https://www.2carpros.com/articles/ford-lincoln-mercury-obd1-1995-and-earlier-diagnostic-trouble-code-definition-and-retrieval

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Friday, June 16th, 2023 AT 7:23 AM

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