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Old 04-15-2008, 03:39 PM   #1
Graham H
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2.5 TJ flat spot at 2000 rpm
As title suggests, My TJ has developed a problem that always seems to happen at 2000 rpm, usually in 4th gear on a gentle incline. It's almost as it the engine bogs down, kind of a flat spot which can be driven through with a bit of a judder. I have replaced the spark plugs, plug leads, rotor arm, dizzy cap all with mopar stuff. Also replaced the air filter with a K&N which seems to reduced the problem slightly (could it be overfueling?)

There are no warning lights and no engine codes to give me a clue so any thoughts apreciated.

Cheers,

Graham.

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Old 04-15-2008, 03:55 PM   #2
DixiesCJ3B
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Check out this thread
http://www.jeepforum.com/forum/f9/2-5l-sputters-2000-rpms-537261/index2.html
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This "Jeep thing" is like dating a really really hot chick, who is crazy! Its alot of fun, you spend too much money, your up all night ending up sweaty & greasy from it, your friends are jealous, you get admission into some sort of weird club... but it gets mad at your for no reason, throws fits seemingly randomly, has unexplained issues which it somehow solves on its own only after you try a bunch of different things (and spend a bunch of money) to solve it... and yet you can't resist getting in it every chance you can.
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Old 04-17-2008, 11:35 AM   #3
Graham H
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Thankyou...Sounds like it may be the o2 sensor(s) then. What i'm not sure about is that the problem seems to be intermittent. I can't make the jeep do it. Could an o2 sensor cause this?

I was thinking maybe an EGR valve problem....What is so special about 2000rpm?
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Old 04-17-2008, 12:43 PM   #4
JeepJohnson
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Exact same problem here. I've had the Jeep for 4.5 years and 32,000 miles and it just started a couple months ago. I had a downstream o2 go out a few years ago that I never replaced though.
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Old 04-17-2008, 01:21 PM   #5
BlueFlame
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You need one of these:
jeeppowerband2.jpg 
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Old 04-17-2008, 01:31 PM   #6
Graham H
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So that's what it needs! Does that come with a part number??

I bet jeep dealers stock them for something too
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Old 04-17-2008, 03:22 PM   #7
DixiesCJ3B
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Quote:
Originally Posted by BlueFlame View Post
You need one of these:

Don't be hatin on us 4 bangers, our jeeps have feelings to
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1999 TJ Wrangler, 4 banger 5-spd
Soft-top, full doors
31" BFG AT, 3" Lift

1954 CJ3B Willys
Hurricane 4, 3-spd with Warn Overdrive, Snow-plow

NGJC# 15
Low Output 4 cylinder Jeep Club Member #166
Build Thread
Are You An Offroad Junkie
Quote:
Originally Posted by MysticGringo View Post
This "Jeep thing" is like dating a really really hot chick, who is crazy! Its alot of fun, you spend too much money, your up all night ending up sweaty & greasy from it, your friends are jealous, you get admission into some sort of weird club... but it gets mad at your for no reason, throws fits seemingly randomly, has unexplained issues which it somehow solves on its own only after you try a bunch of different things (and spend a bunch of money) to solve it... and yet you can't resist getting in it every chance you can.
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Old 04-17-2008, 03:30 PM   #8
BlueFlame
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NO worries.
I have one for mine too...
jeeppowerband.jpg 
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