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Engine idles very high I replaced then intake manifold gasket?

Tiny
BWEIDNER
  • MEMBER
  • 1995 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
I replaced then intake manifold gasket because there was anti-freeze in the oil. After reassembling, the engine starts but the idle is very high no tachometer so I do not know how high. I have checked all electrical connections and vacuum lines, I am unable to find problem.
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Thursday, December 13th, 2007 AT 8:27 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the throttle body/plate binding, acclerator linkage, idle air control valve, throttle position sensor and false air leakage.
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Thursday, December 13th, 2007 AT 11:57 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
I would say the IAC motor is stuck due to rust, here is a guide to help us and I have included the IAC valve location so you can swap it out.

https://www.2carpros.com/articles/engine-idles-too-high

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Wednesday, October 2nd, 2024 AT 4:41 PM

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