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Unread 01-20-2013, 03:20 PM   #1
micktompkins
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Join Date: Jan 2013
Posts: 3
Intermident Rough Engine Starts Please Help!

Hello All!

Longtime lurker and first time post, so here it goes:

For the past month or so now my 98 TJ 2.5 4cyl/auto w/150,xxx has been acting terrible on cold start ups. The best way to describe the problem would be that it seems to lose spark among one or more cylinders until the motor hits normal operating temp. I would think that it may just be a cold engine but this sometimes happens while I am driving with normal engine temps...this sometimes leads to a dangerous scenario of practically losing all power on the highway until the jeep decides that its ready to chug along once more.
Now for about a month I have been lurking around this forum amongst others trying to pinpoint the problem but am still at a loss. So far I have replaced spark plugs/wires/coil distributor cap and rotor yet I am still having this issue.

Any help would be much appreciated,

Mick

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Unread 01-20-2013, 04:02 PM   #2
oakmckinley
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1999 TJ Wrangler 
 
Join Date: Mar 2010
Location: Minneapolis, MN
Posts: 1,446
Welcome to the forum.

When it gets real cold (like tommorrow -15F) my TJ 2.5L sounds like a tank. I give it a little leeway seeing its 14yrs old. I get a little grouchy too when it gets too cold.

As far as the loss of power during driving, try cleaning out the throttle body. I had a similiar issue where I'd go to pass somebody and the Jeep lurched and coughed. It happened when I tried to gun it to hard. Cleaning out my throttle body cured the problem for me. There is a good write up on here.
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Unread 01-20-2013, 04:05 PM   #3
micktompkins
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Thank you for the welcome and quick reply. I'll read up on the DIY and hopefully get to clean it in the next day or so.

Thanks Again,

Mick
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Unread 01-27-2013, 07:21 PM   #4
micktompkins
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Join Date: Jan 2013
Posts: 3
Hi all! Finally got around to cleaning the throttle body this weekend and it seemed to fix the issue for unfortunately only 5 or so miles. Sometimes the only thing that seems to fix the problem is just turning the key off then back on and the jeep will run smoothly for a short time before acting like its choking up again. Any other suggestions to try and remedy this problem (possible ECU/ECM maybe??)

Thanks again in advance,

Mick
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