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1992 Chevy Van engine surging/hesitation

Tiny
NEAL KOHLER
  • MEMBER
  • 1992 CHEVROLET VAN
  • V8
  • 2WD
  • AUTOMATIC
  • 166,456 MILES
Gentlemen,
My van has an intermittant engine surge which occurs when engine is hot or cold. I have had a recent tune up, new filters, new fuel pump and two diagnostic computer checks, all to no avail. It sometimes does not occur until the next day. When it does run properly, the engine idles and runs beautifully. Thank you for any help with this annoying situation.
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Sunday, February 22nd, 2009 AT 12:32 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi:
If there are no codes and you replaced the fuel pump, then I would be looking for a vacuum leak. Is this a 305 CI V8? If so, check around the intake for leaks. Also, check the EGR to make sure it isn't sticking.

Let me know what you find.

Joe
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Sunday, February 22nd, 2009 AT 1:44 PM
Tiny
NEAL KOHLER
  • MEMBER
  • 2 POSTS
To:Jacobandnicholas
The engine is a 350ci fuel injected. We have checked for leaks several times. The EGR valve was replaced during the tune up. Appreciate any other ideas. Thanks
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Wednesday, February 25th, 2009 AT 12:41 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
The only thing I can think of is a bad TPS or IAC. The problem is without a check engine light and a code, I can't be sure.
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Thursday, February 26th, 2009 AT 8:04 AM

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