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After engine warm up, idle speed decreases till the engine dies.
1999 Mercury Sable

After engine warm up, idle speed decreases till the engine dies.

(1999 Mercury Sable)
What would cause this problem.
1 answer & 4 comments
Popular Answer
on April 11, 2015
Vacuum leak @ PCV valve hose(s)... Check engine light on with lean codes?
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on April 14, 2015
On a computer read out, it said an O2 sensor was bad..there were no lean codes..writing for husband and he did have one more guy that mentioned the vacuum leak..thanks for your time.
on April 14, 2015
Vacuum has large influence on 02 sensor!!
on April 14, 2015
Thank you! I'll pass this on.
on April 14, 2015
✔️
General Diagnosis
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on April 11, 2015
Vacuum leak @ PCV valve hose(s)... Check engine light on with lean codes?
Sign in to reply
on April 14, 2015
On a computer read out, it said an O2 sensor was bad..there were no lean codes..writing for husband and he did have one more guy that mentioned the vacuum leak..thanks for your time.
on April 14, 2015
Vacuum has large influence on 02 sensor!!
on April 14, 2015
Thank you! I'll pass this on.
on April 14, 2015
✔️

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