I unplug the vacuum from the MAP sensor it idles good?

Tiny
WILLIAMARNETT92
  • MEMBER
  • 1994 GEO TRACKER
  • 161,000 MILES
When I start the car it idles high but when I unplug the vacuum from the MAP sensor it idles good what could be wrong?
Thursday, July 5th, 2012 AT 12:27 AM

3 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Do you have any codes in the computer? Also have you checked for vacuum leaks yet, it sounds like you have a bad MAP sensor
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Thursday, July 5th, 2012 AT 12:41 AM
Tiny
WILLIAMARNETT92
  • MEMBER
  • 8 POSTS
No codes and I just replaced the vacuum lines
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Thursday, July 5th, 2012 AT 12:44 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I would get a can of carb spray let it idle and spray around all vacuum sources intake manifold hoses etc.If the rpms go up when you found a vacuum leak.

This guide can help

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

Please go over this guide and report back.
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Thursday, July 5th, 2012 AT 4:26 PM

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