90 2.5L fuel issues
#1
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90 2.5L fuel issues
I've got a 90 xj 2.5L with 5-speed 2wd and just recently its started osiliatcing at idle and bogs down really bad when im driving it. Its not the the point where i can't drive it. I had to move it last week to get it to my new place and I couldn't go over 45 at full pedal. When it bogs down if I feather the gas heavily it starts to clear up and accelerates. I am thinking it could be the MAP sensor or TPS but i don't wanna spend like $150 in parts for it not the be the answer. If anyone has any idea what it could be or maybe confirm my theory it would be greatly appreciated.
#2
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Join Date: Apr 2010
Location: Marion, IN
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Year: 2001
Model: Cherokee
Engine: 4.0
I've got the 2.5L as well, and I have the same problem. I did a full tune up- new plugs and wires, cap and rotor, injectors, fuel filter- and it still runs ****ty sometimes. I lose all power with the gas in, if I floor it a get a pop from the engine compartment and it runs good. Or i can let off the throttle sometimes it won't do it before shifting to the next gear. It's also completely unpredictable. I drove 500 miles last week without one issue. And it started up again today. I hope that wasn't too discouraging! I haven't got any help on here tho- just common tips like gas additives and basic engine service.
#3
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Location: Burtucky,Michigan
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Year: 1999
Model: Cherokee
Engine: 4.0
Try pulling the throttlebody and cleaning the heck out of it.Also check all of your vacuum lines and your timing.Check your distributor for any moisture.
Last edited by AutomaticKrackr; 05-18-2010 at 10:57 PM.
#4
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Year: 2001
Model: Cherokee
Engine: 4.0
Thanks for the reply. I tried to adjust the timing but they're no give to turn the distributor. Is there some sort of button to push to get it to move? Also, I kinda gave up on the timing being a possible issue because I was told on here and from a mechanic friend that if the timing is off the backfire would be pretty bad- or at least fairly consistent. I'm going to look into cleaning the throttle body and checking vacuum lines. I'm a novice mechanic at best.. but I'm learning! XJ's seem really straightforward.. and this forum has been a great tool to use with the service manual.
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