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High Idle, RPM surges

Tiny
FOREIGNLEGEND
  • MEMBER
  • 2002 MITSUBISHI GALANT
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 380,000 MILES
Hello, my car has a really high idle rpm and it surges up and down when I let off the throttle. I just replaced my throttle body and it was perfect for about a month, and now it happens again.

Thank you for your time.
Friday, December 8th, 2017 AT 5:57 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,313 POSTS
Hello,

This sounds like you have an EGR valve that is leaking causing the engine idle to fluctuate idle speed high then lower.

Here is one guide and one video that will help us do a quick check to confirm the failure:

https://youtu.be/DqUCbbKdWf4

and

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

Check out the diagrams (below).

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Saturday, December 9th, 2017 AT 7:14 PM

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