OMG ZJ on 42" tires!!!! - JeepForum.com

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post #1 of 16 Old 11-04-2010, 08:34 PM Thread Starter
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

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zj3.jpg   zj4.jpg  

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post #2 of 16 Old 11-04-2010, 08:40 PM
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.

98' 5.2 ltd, 4.5" lift, 33x12.50 KM2's, Clayton's longarms, 8.8/HP30 Aussie F&R
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post #3 of 16 Old 11-04-2010, 08:41 PM Thread Starter
Erbo1Kanerbo
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nope its been connected for a while

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post #4 of 16 Old 11-04-2010, 10:43 PM
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.

1997 zj 4.0 np242 5.5" iro lift. 33x12.5r15 khumo mtrs.---- rolled and sold :'(
1997 zj ltd 4.0 np249 black np 4" rough country lift 33x12.5r15 mtrs.----sold
1999 xj sport 4.0 np242 waiting for 4.5." Lift and 33s :D
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post #5 of 16 Old 11-05-2010, 12:32 AM
ratmonkey
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Those rpm are really low for that speed. Really low. What tires you running?

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #6 of 16 Old 11-05-2010, 08:16 AM Thread Starter
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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post #7 of 16 Old 11-05-2010, 09:51 AM
clemsonyj
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Coil or TPS. My coil went out and did the exact same thing. Idle surged while moving.
Max

91 YJ: 2.5L, 31 A/T's, Crager soft 8's: SOLD

94 ZJ 5spd: RE 3.5" Superflex Kit, HPD30, Lockright, 32 Maxxis Bighorns, Rhino-lined Floors, Homebrew Sliders, Hacked fenders: SOLD

98 ZJ: 5.2L, RC Budget Boost, 16" Moabs, Goodyear MTR's, NP242, Magnaflow 3"
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post #8 of 16 Old 11-05-2010, 10:21 AM Thread Starter
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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post #9 of 16 Old 11-05-2010, 11:41 AM
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.

Jamie


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post #10 of 16 Old 11-05-2010, 12:01 PM Thread Starter
Erbo1Kanerbo
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i thinks its time to pull the trigger on that kolak ignition upgrade then...

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post #11 of 16 Old 11-05-2010, 03:25 PM
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Check, clean, or replace you idle air controller.
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post #12 of 16 Old 11-05-2010, 08:42 PM Thread Starter
Erbo1Kanerbo
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already cleaned my iac

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post #13 of 16 Old 11-07-2010, 11:53 AM
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

91 YJ: 2.5L, 31 A/T's, Crager soft 8's: SOLD

94 ZJ 5spd: RE 3.5" Superflex Kit, HPD30, Lockright, 32 Maxxis Bighorns, Rhino-lined Floors, Homebrew Sliders, Hacked fenders: SOLD

98 ZJ: 5.2L, RC Budget Boost, 16" Moabs, Goodyear MTR's, NP242, Magnaflow 3"
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post #14 of 16 Old 11-07-2010, 03:10 PM
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

1998 ZJ Limited 5.9L l Vortech Supercharged l SCT, 42lb Bosch, 255lph l Kolak 3" Exhaust w/ E-Cutout l KOR TB Conversion l Addco Swaybars F/R l JKS Rear TB l ORO U-Turn Steering w/ OME stabilizer l RE 4.5" Springs and Monotube Shocks l IRO Rear CAs l Kolak Ignition l Clayton Fronts l

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post #15 of 16 Old 11-07-2010, 08:05 PM Thread Starter
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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