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Unread 11-04-2010, 08:34 PM   #1
Erbo1Kanerbo
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OMG ZJ on 42" tires!!!!

I have a problem... i knew the title would get ya. When i am going down a hill and i let off the accelerator my rpms will bounce. It will bounce up to about 1500 rpm then go down to about 1000 rpm then it will go back up to 1500 this is going about 50-60 mph if someone could help me out id really appreciate it thanks...


i felt bad for the title so heres some pics of the outlaw offroad zj my personal favorite idk if its on 42's or not lol

zj3.jpg   zj4.jpg  
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Unread 11-04-2010, 08:40 PM   #2
98BlackZJ
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Was your battery disconnected recently? Mine does that for about 100 miles after the battery is disconnected. I think its the computer relearning the shift points.
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Unread 11-04-2010, 08:41 PM   #3
Erbo1Kanerbo
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nope its been connected for a while
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ZJ's: If you dont know what it is you cant afford it.
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Unread 11-04-2010, 10:43 PM   #4
paintball10148
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hmm i know that when my TPS went out my rpms had a mind of their own.. are there any other strange things goin on? and since you tricked me into this thread ima comment haha its nice to see that the outlaw isnt a trailer queen and that it actually sees some wheeling.
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1999 xj sport 4.0 np242 waiting for 4.5." Lift and 33s :D
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Unread 11-05-2010, 12:32 AM   #5
ratmonkey
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Those rpm are really low for that speed. Really low. What tires you running?
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Unread 11-05-2010, 08:16 AM   #6
Erbo1Kanerbo
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its not exact rpm but its real close, im still running 235/75/15's im trying to get everything sorted out before i put bigger tires on. i know something is messed up with my driveshaft too because i feel a resistance when it is in and when i slow to a stop a can hear a whining noise.
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Unread 11-05-2010, 09:51 AM   #7
clemsonyj
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Coil or TPS. My coil went out and did the exact same thing. Idle surged while moving.
Max
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Unread 11-05-2010, 10:21 AM   #8
Erbo1Kanerbo
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what coil? when i think coil i think of the springs lol. i know its prob something electric but where i can i find some info on this
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Unread 11-05-2010, 11:41 AM   #9
JFox21
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Quote:
Originally Posted by Erbo1Kanerbo View Post
what coil? when i think coil i think of the springs lol. i know its prob something electric but where i can i find some info on this
Ignition coil.
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Unread 11-05-2010, 12:01 PM   #10
Erbo1Kanerbo
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i thinks its time to pull the trigger on that kolak ignition upgrade then...
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Unread 11-05-2010, 03:25 PM   #11
ZJPunk98
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Check, clean, or replace you idle air controller.
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Unread 11-05-2010, 08:42 PM   #12
Erbo1Kanerbo
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already cleaned my iac
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Unread 11-07-2010, 11:53 AM   #13
clemsonyj
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Quote:
Originally Posted by Erbo1Kanerbo View Post
what coil? when i think coil i think of the springs lol. i know its prob something electric but where i can i find some info on this
Seriously? Your car has an ignition coil....
Max
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Unread 11-07-2010, 03:10 PM   #14
TheAngus
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ignition coil on a v8 is at the front pass side of the engine block...right between the battery and the motor
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http://www.siliconeintakes.com
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Unread 11-07-2010, 08:05 PM   #15
Erbo1Kanerbo
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no i was joking... sorry im not a mechanic but thats why im on the forum, to learn. if someone had said ingnition coil i would have known. i dont know very much about stuff under the hood
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