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Old 07-11-2008, 02:58 PM   #1
Fossa d'Mouse
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1999 Quest high idle in gear

3.3L 134,000 miles. When put in gear, idle increases by 4-500 rpm’s. NO engine codes. Nothing seems to be sticking. Tried cleaning throttle body – does not make a difference. Checked vacuum OK. Idle speed will not go down no matter what I do. Dealer tells me they have not heard of this. Has anyone seen anything like this? Can anybody tell me what to look for or what to try next?
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Old 07-12-2008, 10:36 PM   #2
tempfixit
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Re: 1999 Quest high idle in gear

Look for a vacuum leak. Check the EGR system. Idle increases when putting in gear is puzzling. Also make sure IAC is working properly. Let us know if you find a leak or not.
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Old 07-12-2008, 10:45 PM   #3
tempfixit
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Re: 1999 Quest high idle in gear

Look for a vacuum leak. Check the EGR system. Idle increases when putting in gear is puzzling. Also make sure IAC is working properly. Let us know if you find a leak or not.
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Old 07-21-2008, 07:05 AM   #4
Fossa d'Mouse
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Re: 1999 Quest high idle in gear

Thank you! Kept checking for vacuum leak but couldn’t find it. Saturday we removed the plenum. Our son found the culprit! The PCV hose had a hairline split on the side of it, near the clamp, located where you could not even see it with a mirror -- we know, we looked! It is a formed hose, so we will order a new one from the dealer today and we’ll put it back together this weekend with our son’s help. What a relief to know the source of the problem. Thank you for your help!
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