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Old September 27th, 2012, 09:17 AM   #1
kkodet
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Default XJ intermittant issue PLEASE HELP!!!

O.K., here goes:

1997 XJ non-sport 4.0 4x4 AX15 bone stock engine.

I have had this Jeep for many many years.

The issue is that it runs great, then for no apparent reason it starts bogging down, backfiring occasionally, and generally running like crap. It has done this for years, usually only once a month or so, for maybe 5-10 minutes, then it is good again. It does not seem to be during any particular time, and it can happen any time. It rarely stalls out, and the engine light will come on after it starts running good again, usually with a missfire code. That itself is a challenge, because some scanners will tell us cylinder numbers. I thought 4.0s of that era couldn't tell which cylinder, so I'm confused.

Well, the issue has been progressi.g to the point where it now will do it every 10-15 miles.

EVERY sensor has been replaced within the last 75,000 miles, some twice. My main "go to" shop (for when I can't figure stuff out) had it for a month, couldn't figure it out and gave it back. My "secondary" shop checked it out, swore I had some bad plug wires, they did a full tune up, and it runs the same.

I am going to take it back to my secondary shop today to give them another go at it, but at this time I am not sure.

Has anyone had the same/similar issue? Please help! I'm about to carburate it or toss in a diesel!
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Old September 27th, 2012, 09:34 AM   #2
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Sorry this may not be much help but why hasn't anyone done live data on it and drive around to see if you can see what is causing the issue. Have you replaced the coil? Any other noise going on when it bogs down? Will it only bog on throttle or at idle as well?

Do you have to drive it to make the condition happen or will it do it just sitting at idle?

The more info the better.
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Old September 27th, 2012, 10:22 AM   #3
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My tj did something similer,it would run fine,then start missing and running like shit.It would stahl,and start right up.I found my main battery cable going into the junction box was loose and coroded.It was not giving the ecm steady voltage
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Old September 27th, 2012, 10:41 AM   #4
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Had kind of the same problem and found out it was a wire shorting out to the fuel rail. There is a small wiring harness that goes to the sensor on the throttle body that runs along the fuel rail.
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Old September 27th, 2012, 11:28 AM   #5
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O.K. all good suggestions that will be checked if the shop cannot get it this time. I just drove it 20 miles with no issue. After talking to head mechanic he is planning on testing coil and going from there.

The issue happens almost exclusively upon driving and will continue at idle if you pull over/stop/slow down but will never do it if you just fire up Jeep and let run at idle. It will idle for hours with no issue.
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Old September 29th, 2012, 09:00 AM   #6
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Picked it up from the shop last night. They diagnosed it as being a shorted downstream O2 sensor. I've driven it about 50 miles so far with no issue, so I'm keeping my fingers crossed.
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