I'm stumped. Help?
#1
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Year: 1996
Model: Cherokee
Engine: 4.0 H.O.
I'm stumped. Help?
96 XJ 4.0 auto and I'm having problems right after start up. I've researched the threads a bit and I can't seem to find anyone with the same problem. Vehicle runs great with just over 100K on it except after start up and I put in drive. It will start to accelerate normally then all of a sudden no matter how much throttle I give it, it kind of bogs down like its going to die until I hear and feel a kind of hollow "pop" under the drivers side where my feet are and then it accelerates fine and I don't have the problem again until I turn it off and restart it. Also taking my foot off the throttle and then giving it gas again when this happens makes it go away as well. It's not a huge problem more of nuisance but I want to make sure it wont lead to something serious down the road. I can't think of anything it could be and the vehicle has had this problem since I bought it. Any ideas?
#6
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Year: 1996
Model: Cherokee
Engine: 4.0 H.O.
I'm changing the o2 sensor tomorrow because i'm getting horrible gas mileage like 10-11 city so we shall see if it fixes it the one nearest to the headers tho not the one after the cat. Ill let you know what I find out. Thanks guys.
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#8
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Year: 1994
Model: Cherokee
Engine: 4.0L HO
Originally Posted by brg0012
Could be a clogged cat.
#9
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Year: 1999
Model: Cherokee(XJ)
Engine: 4.0L
I had a '99 that did the same thing. Would start fine, but just as I was pulling out it would bog some times, pop then run fine. Never did figure it out.
#10
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Year: 1996
Model: Cherokee
Engine: 4.0 H.O.
So time for a newish cat eh? Theres a really nice all Jeep pull your parts near my house ill pick one up and let you guys know if it fixes the issue. Thanks for all the input!
#12
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Year: 87-99
Model: Cherokee
Engine: 4.0
My 97 did the same thing, my initial thought was the cat, I installed a test pipe to verify and that turned out to be a wrong idea. I threw sensors at it, tune at it, etc, nothing solved the issue. What finally fixed it, was my down stream HO2 sensor wiring was shot back towards the t-case, I replaced the wires problem solved. Any codes stored?
#13
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Year: 1994
Model: Cherokee
Engine: 4.0L HO
Check out WWW.performance-curve.com
You can get a good exhaust system real cheap there. I'm running their 2.5" mandrel bent system.
You can get a good exhaust system real cheap there. I'm running their 2.5" mandrel bent system.
#14
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Year: 1996
Model: Cherokee
Engine: 4.0 H.O.
Update: Alright guys the other day I put in a new upstream o2 sensor and the problem is GONE. Idles better and has more pickup too. Pretty sure I get better gas mileage as well not sure yet have to go thru the whole tank but I was averaging 200-220 per tank.
#15
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Year: 1991
Model: Cherokee
Engine: 4.0
Thanks! It fixed my problem too!! I'm soo happy. Cuse it was rather embarrasing when a cute girl is walking and your jeep backfires.