High idle

Tiny
JAMES CONN
  • MEMBER
  • 1997 CHRYSLER LHS
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,103 MILES
My cars Idle was working fine. Then one day just started idling high, around 2,200 RPMs.
What could have caused that?
Monday, March 15th, 2021 AT 8:11 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,744 POSTS
That's typical of a vacuum leak. Start by checking out this article:

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

and this video:

https://youtu.be/4ktw1X4W_-k

Let me know what you find. We can also look at the automatic idle speed circuit, but you'll need a scanner for that so we can look at live data while the engine is running.
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Monday, March 15th, 2021 AT 1:32 PM

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