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2005 Mercury Sable High Idle Problem

Tiny
JEPOHLMAN
  • MEMBER
  • 2005 MERCURY SABLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 46,150 MILES
Sitting in park or at a light the engine idles at about 700 rpm without any problem.

If you put the car in neutral while going down a hill the idle stays up in the 1800 rpm range if you're doing around 65 mph and then drops down to around 1400 at about 50 mph.

If this is done around 30 mph the idle drops down to the 700 rpm range where it should be.
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Saturday, February 21st, 2009 AT 1:12 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,896 POSTS
Hi:
Has the check engine light come on?
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Saturday, February 21st, 2009 AT 7:35 PM
Tiny
JEPOHLMAN
  • MEMBER
  • 6 POSTS
The check engine light hasn't come on.
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Saturday, February 21st, 2009 AT 11:36 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,896 POSTS
If there is no check engine light, check for vacuum leaks. Make sure none are disconnected dry rotted, or broken.
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Sunday, February 22nd, 2009 AT 12:41 PM
Tiny
JEPOHLMAN
  • MEMBER
  • 6 POSTS
No vacuum leaks found. Pulled the IACV and there wasn't any carbon buildup on it to speak of.

Resistance was 9.9 ohms.
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Wednesday, February 25th, 2009 AT 8:25 PM

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