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

1994 GEO TRACKER
161,000 MILES
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WILLIAMARNETT92
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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?
Jul 5, 2012 at 12:27 AM
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SATURNTECH9
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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
Jul 5, 2012 at 12:41 AM
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WILLIAMARNETT92
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no codes and i just replaced the vacuum lines
Jul 5, 2012 at 12:44 AM
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SATURNTECH9
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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.
Jul 5, 2012 at 4:26 PM