my 96zj 4.0 cuts in and out, doesn't matter what speed and there's no pattern. It will cut out like it just ran out of gas but only for a moment, then's it's fine. The Check Engine light came on when it first happened but has since turned off. Doesn't run rough, just cuts out. Could it be a fuel thing, like a filter? Any input would be appreciated. Thanx.
The only "equipment" you need is your ignition key... turn the key on-off-on-off-on (without starting the engine) within 5 seconds and note the pattern of flashes of the Check Engine lamp. It will blink out the codes, if there are any, stored in the PCM. Look for 2 digit codes (a pause between the numbers). The number "55" indicates the end of the test.
Post the codes and someone here will be able to tell you what they mean.
Crank Position Sensor would be my guess as the culprit.
I had the same thing go wrong with my jeep at 150k.
In my situation, I didnt have a code, just the cutting in and out at any speed. Item runs for 80+ at autoparts store for my jeep. not sure if you have one on your jeep, but worth looking into. 20 min fix. make sure you have at least 2 feet worth of extensions and a swivel adapter. YOU WILL NEED IT unless your hands are smaller than an asian guy at 5'7" and a weight of 150. THAT asian guy would be me!!! so no one can say im talkin trash.
2001 Cherokee XJ Sport 4.0L
3" Rough Country Lift w/ Daystar 1.25" TC Drop Kit
Flowmaster Delta 40 Series
K&N Drop in Air Filter & Procomp 10" E-Fan
AirRaid TB spacer w/ 62mm Bored TB
BFG All-Terrain K.O. on Black ProComp 87's
I had that same problem. Mine was the PCM...replaced it and no more cutting out. I went and changed everything else first...TPS, AIS, MAP, Crank pos sensor, cleaned throttle body. These things could be a contributing factor but not in my case. Good luck.
1996 ZJ - 4.0 w/ 164,000 miles
3" Rusty's springs, Bilstein 5150's, JKS Quicker Disco's, IRO Adj. Lower Control Arms, Rough Country SS, KOR's adj. TB conv. kit, JKS Rear Track Bar, IRO OTK Steering,
31x10.5x15 Goodyear Dura-trac's on Ultra Rogue Wheels
ZJs Only club member #58
The Check engine light has gone off but the problem still exist. I tried the on-off-on with the key but nothing came up code wise. I remember about 8 months ago I had a similar problem and it turned out to be the Crank Sensor. The symptoms were different then. Back then the engine would run very rough, like it was on 2-3 cylinders. This time it just momentarily cuts out. I could try and check the CS according to the manual I guess. Thanks.