Problems with Idle RPM way too high. - JeepForum.com

 
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post #1 of 5 Old 02-11-2012, 04:56 PM Thread Starter
Cjonck1774
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1997 TJ Wrangler 
 
Join Date: Feb 2012
Location: Lubbock
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Problems with Idle RPM way too high.

I've had my Wrnagler TJ for about 4 years now, and when ever it gets cold here in TX my Idle RPM's are about 1500. In trying to fix this problem I haveput on a Brand new TPS and IAC on the throttle body. After doing so the jeep now starts off Idleing fine when the engine is cold but as it warms up it will climb to close to 2000 RMP when out of gear, and when its in gear and moving it will go back down to lower RPMs until you hit that red traffic ligh and it jumps up agian. I dont know if it effects anything but it also has a AEM intake that has been there since i bought it... Again this usually only happens during the winter. Does anybody have any suggestions as to what the problem might still be?

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post #2 of 5 Old 02-11-2012, 05:01 PM
tac426
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2001 TJ Wrangler 
 
Join Date: Jul 2010
Location: nashville
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try unhooking the battery for 10 minutes or so, then hook it back up the computer may fix it as it goes through its startup sequence.
good luck
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post #3 of 5 Old 02-11-2012, 05:03 PM
Barcus
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2000 XJ Cherokee 
 
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Location: Duluth
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check the bolts on your exhaust manifold and check for any leaks in your exhaust. if you have an exhaust leak, you will idle higher. typically, if any bolts are going to be loose, they are the two closest to the firewall. when I had your problem, they were only finger tight.

98 TJ Currie arms-RC 2.5 coils-RC 2.0 shocks-1.25 BL-TF rear track bar-custom bumpstops-mud-scratches-gas.
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post #4 of 5 Old 02-11-2012, 05:04 PM
colaman24
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1999 TJ Wrangler 
 
Join Date: Jan 2011
Location: orange park
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Check for a vacuum leak, 2 to 3 lines come off the intake. If one gets old and cracks, it leaks am and will accelerate your rpms
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post #5 of 5 Old 02-11-2012, 08:16 PM
guy.griffin
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1997 XJ Cherokee 
 
Join Date: Sep 2006
Location: Roscoe
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also check injector seals. Get some throttle body cleaner spray around injectors while its running the idle drops as your spraying than you have bad seals
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