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Old 06-16-2006, 10:17 PM   #1
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rpm question

i have a 98 tj with 4.0 and auto trans,what should the idle be at in park and in drive sitting still?my jeep has 57k on it.also,i changed plugs,wires,cap and rotor and i have a rough and also high idle(about900 rpm's in drive sitting still)any help PLEASE!!thanks!

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Old 06-16-2006, 10:22 PM   #2
coilovers are damn flexy
 
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I would think that your idle rpm should not be over 500-600. Did this just happen after you replaced the plugs?

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Old 06-16-2006, 10:26 PM   #3
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no,it's always been that high.i thought it was normal for a jeeprough idle is just getting worse,i was thinking throtle position sensor?
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Old 06-16-2006, 10:27 PM   #4
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is there a adjustment on a throtle body?
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Old 06-16-2006, 10:30 PM   #5
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im not sure where it is but i know you can make your idle faster and slower some how (you can turn the idle up or down)
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Old 06-16-2006, 10:32 PM   #6
coilovers are damn flexy
 
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I was wondering if you needed to clean the throttle body, and all linkages on the outside, see if that helps. They do get gummy after a while. Barryman's Carb. cleaner is a very good brand to use. I wish I got a commision from them, as often as I have recommended their stuff........lol. Also check all of your vaccum lines. I had one that went to the cruise control get a small hole in it...........the wife stayed on my case until I found the leak, and fixed it. She drives it to work everyday, and loves her cruise control. I even tried to use the excuse, it's a Jeep honey, what do you need cruise control for?,.... but that didn't work.
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Old 06-16-2006, 10:35 PM   #7
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thanks ill give it a try!

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