MAP sensor bad?

Tiny
DANSFRAZ
  • 1996 TOYOTA COROLLA
  • 164,000 MILES

My car idles really high, 1600-1800 rpm. I sprayed carb cleaner around all my vacuum lines an gaskets to try to find a leak and cane up empty handed. If I unplug the MAP sensor while the engine is running, the idle drops to 1000-1100. The IAC valve was tested and turned out to be good. Is the MAP sensor bad or what else am I supposed to check.

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Sunday, April 22nd, 2012 AT 9:36 PM

5 Replies

Tiny
ASEMASTER6371
  • EXPERT
  • 25,554 POSTS

No, map good. You either have a vacuum leak, stuck throttle body or bad idle air control motor. How did you test it?

Roy

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Sunday, April 22nd, 2012 AT 10:00 PM
Tiny
DANSFRAZ
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I didn't physically test it myself, I went to a shop and they ran a test and said it was. Now Im starting to think I may have been lied to just because they couldn't figure it out. Is there a visual way to see if the TB is stuck? And short of a smoke test, whats the best way to find a vacuum leak?

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Sunday, April 22nd, 2012 AT 10:47 PM
Tiny
ASEMASTER6371
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No visual way as 1/32 of an inch will cause this.

Listen for a vacuum leak. Otherwise get a new shop to help you.

Roy

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Sunday, April 22nd, 2012 AT 11:11 PM
Tiny
DANSFRAZ
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How do I test my Idle air control valve?

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Sunday, April 22nd, 2012 AT 11:29 PM
Tiny
ASEMASTER6371
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You cannot unless you have a scan tool. It is a process that activates it and retracts it to test.

Roy

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Monday, April 23rd, 2012 AT 12:01 AM

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