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Old 04-09-2007, 10:24 PM   #1
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fast idle and converter lock up

hey this is my first post so bear with me. i have a 98 tj with a 4.0L and a 3 speed auto. after startup it goes to a fast idle up to about 1600 and it stays there untill you drive for awhile. Eventually it will go back down to 1000 (which still seems high). and also when i pull up to a stop light it seems as though the torque converter is still locked up. i thought that the converter was suppost to unlock when the brakes where applied. if i sit at a light and let off the brakes, my jeep will go 15mph before i even have to push on the gas. i need some help to get these problems fix before the summer trail season.

thanks in advanced for all the help.

Jeepin'inkansas

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Old 04-10-2007, 07:09 AM   #2
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Your Jeep is idling way too high, you need to get it to a shop and have it looked at.

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Old 04-10-2007, 12:11 PM   #3
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Not the shop

hey

i know that is way to high but i dont want to take it to a shop. i forgot to add that about 6 months ago i had a TPS code come up. so i looked around on the net for a fix and what i found was that it was a common problem and to disconnect the ground which it shares with the horn. so after i did that it never happened again but now i have more troubles. i need so serious help.


thanks

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Old 04-10-2007, 12:32 PM   #4
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just replace your TPS a simple plug and a couple torx bolts. there not that expensive and most auto places carry it.
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Old 04-10-2007, 02:08 PM   #5
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One of two things:
1 Vacum leak
2 TPS
These are the primary reason for high idle. You could take that sensor out that clean it really good with some carb cleaner.
Also check all of your vacum lines to make sure nothing is loose or needs to be replaced. When ever your engine revs and you are in gear then of course your jeep is going to want to go foward. It doesnt matter if the brake is being held or not. I would check that before taking it somewhere.
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99' TJ I6 4.0L
4" Skyjacker
33x12.5 Firestone Destination M/Ts(Super Sticky!)
4.56s Front and rear
Super 35 Kit w/ Detroit TruLocker in Rear
quick discos
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Old 04-10-2007, 05:36 PM   #6
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Ive never seen a vacuum leak raise an idle. typically they make a motor not idel or run rough.
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Old 04-10-2007, 08:03 PM   #7
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if the vaccum leak is in any part of the intake system then it will raise the idle. In fact i just got through my own issue with an leak on my intake manifold and it almost made my idle redline. my thought is that if you have a leak in one of the smaller vacum lines on the intake manifold it might cause the rpms to raise. Think about it: Leak in intake = more air into the motor. More air in motor = opening throttle or giving it gas.
Although my logic could be wrong.

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.................................................. ..................
99' TJ I6 4.0L
4" Skyjacker
33x12.5 Firestone Destination M/Ts(Super Sticky!)
4.56s Front and rear
Super 35 Kit w/ Detroit TruLocker in Rear
quick discos
Rugged Ridge Header w/ FlowMaster 40

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