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Unread 06-09-2010, 01:15 PM   #1
blackdog69
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Join Date: Feb 2007
Location: falmouth
Posts: 11
Fast Idle
In my 1993 Grand Cherokee, auto transmission, this just started. When I start vehicle, it idles at 2000 rpm. After driving awhile, the idle is normal about 1200. What is causing this rapid idle....maybe the choke is sticking? Any recommendations? Only 120K miles total.

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Unread 06-09-2010, 01:28 PM   #2
JrMechanic
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1993 ZJ 
 
Join Date: Oct 2008
Location: Lima, Ohio
Posts: 3,366
No choke on a fuel injected Jeep. It's most likely either the IAC, or a vacuum leak.
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Unread 06-09-2010, 01:56 PM   #3
blackdog69
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Join Date: Feb 2007
Location: falmouth
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what and where is the iac? how do i look for a vacuum leak? thanks
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Unread 06-09-2010, 02:07 PM   #4
-Joe-
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1995 ZJ 
 
Join Date: Jan 2005
Location: Lexington, KY
Posts: 4,634
idle is normal at 1200rpm? Still sounds fast.

Sounds like its time for a good TB cleaning.
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'95 Jeep Grand Cherokee Laredo I6 4.0L
242TC - Extreme Engineering 2" Front Lift/1.75" Rear Lift - ES9000 Shocks + JKS BPEs
Moog Cargo Control Springs
Magnaflow Converter - Dynomax Muffler
235/75/15 AT Uniroyal Liberator Tires
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