High idle

Tiny
GSTEPHENS
  • MEMBER
  • 2003 PONTIAC GRAND AM
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 186,000 MILES
My car listed above (GT model) runs high idle about 3,000 rpm's. Has anyone found the problem yet?
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Monday, February 3rd, 2020 AT 12:36 PM

1 Reply

Tiny
DUFFDIVER
  • EXPERT
Hello,

It could be the EGR valve is stuck open. Check the EGR valve pintle position for sticking open. And it could also be the lower intake manifold gaskets leaking manifold vacuum on the bottom side this it very hard to diagnose because the gaskets are like plastic and crack and break on the underside of the intake manifold and can be leaking between intakes ports. If you can get a data list reading on a scan tool check the manifold air pressure sensor for an high reading and the O2 sensors readings are low. I'm attaching repair guide and views of the intake manifold below. let us know if this information was helpful.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Thank you
Joe T.
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Monday, February 3rd, 2020 AT 5:26 PM

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