Intermittent idle

Tiny
STEVE SHERIFF
  • MEMBER
  • 1986 MERCEDES BENZ 420SEL
  • 4.2L
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Engine continues to idle high for a few moments then idles low for a few moments. But runs good on open highway.
Saturday, August 20th, 2016 AT 9:07 AM

1 Reply

Tiny
RENEE L
  • ADMIN
  • 1,257 POSTS
Hello,

It sounds like you have a vacuum leak, here is a guide that should help you

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

Pleas let me know what you find out so we can continue.
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Tuesday, August 30th, 2016 AT 9:22 AM

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