RPM Revving issue - JeepForum.com
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post #1 of 5 Old 06-24-2010, 08:49 PM Thread Starter
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1999 TJ Wrangler 
Join Date: Jun 2010
Location: Michigan
Posts: 11
RPM Revving issue

My 99 Wrangler 4.0 started having RPM issues about a month ago. Sporadically the RMP's jump way up for a while then go back down to normal idle RPM. It happens when sitting at a light in drive and also if it is in park, just idling. It often revs way up when i put it in park after stopping. Thoughts?

davekippen is offline  
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post #2 of 5 Old 06-26-2010, 06:16 PM Thread Starter
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1999 TJ Wrangler 
Join Date: Jun 2010
Location: Michigan
Posts: 11
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post #3 of 5 Old 06-26-2010, 06:20 PM
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1998 TJ Wrangler 
Join Date: Jan 2006
Location: Ardmore, Tn.
Posts: 673
How old is your battery? I had a somewhat similar issue once and my battery was going bad. It could be a vacuum leak as well. Have you replaced the exhaust manifold or anything lately?
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post #4 of 5 Old 06-26-2010, 06:23 PM
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1971 J-Series Truck 
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When did you last clean your throttle body and IAC?
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post #5 of 5 Old 06-26-2010, 06:24 PM
Jerry Bransford
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2004 TJ Wrangler 
Join Date: Jan 2003
Location: Escondido, California
Posts: 69,078
A vacuum leak is often responsible for high rpms, has anyone worked on or around the intake manifold lately?

When you have a choice, buy American made.
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high rpm , vacuum , leak

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