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Old 02-05-2017, 09:50 AM
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01 WJ slipping?

My jeep started doing a weird thing. When i was accelerating randomly sometimes it would just stop for a split sec and pick back up. I thought it was losing fuel pressure for a sec and then coming back on. This morning it did that but it turned into a noticeable jerk kinda and it felt more toward the back end. Idk if it'd be the transmission slipping or my ujoints. Anyone ever have this problem?


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Old 02-05-2017, 10:27 AM
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Re: 01 WJ slipping?

Also. It only does it when I'm driving it. I can sit in park or neutral and give it gas and it's normal.


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Old 02-05-2017, 12:27 PM
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Re: 01 WJ slipping?

Which engine?
Depending on the engine/transmission, the electronics will see if there is an internal slippage (different ratio between input speed and output speed for a certain gear.)
Do you see the engine rpm suddenly going up when the problem starts?


Edit: oh, I just see that it is you again.
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Old 02-05-2017, 12:42 PM
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Re: 01 WJ slipping?

It's a 4.0. No the rpms drop when it happens. I keep getting a p0161 code. That's for the o2 sensor from what I read. Would this be causing the problem? From what I can tell I don't have a cat from where someone had replaced the exhaust. The only 2 o2 sensors I have are the 2 up close to the manifold by the mini cats. I replaced one of those already, so could it be the other one?


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Old 02-05-2017, 01:49 PM
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Re: 01 WJ slipping?

Ok, so if the engine rpm drops, then the transmission is not slipping. The problem must be engine related.
The P0161 code is for the after cat sensor, but if you donīt have after (mini) cat sensors, then this code seems to be strange.
Best is, when one O2 sensor goes bad, to replace the opposite as well. They normally have the same time on the jeep and when one goes bad, the other one is not too far from that point as well.
Without any other fault codes, it will become an expensive game of changing parts and hoping that you change the faulty part.
Better would be to use a scanner with live data, to see where there is any discrepancy in the readings. If you donīt have a scanner, but do have a smart phone, then you can buy a cheap Bluetooth dongle of e-bay and download the free Torque App. With this App you can read the faults from the PCM, reset them, but also see many live data.
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Old 02-05-2017, 04:03 PM
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Re: 01 WJ slipping?

Alright. I bought the 2nd o2 sensor and gonna put it on tonight to see if it works. I have a buddy with a scanner so I'll get him to run it and see


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Old 02-05-2017, 06:37 PM
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Re: 01 WJ slipping?

So I put the 2nd o2 sensor on and it's still doing the same thing. Could i have got a bad fuel pump. It was new. The brand was Masterpro. Is that a crappy brand that's prone to going out quick?


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Old 02-06-2017, 05:09 AM
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Re: 01 WJ slipping?

Possible, yes, but you will need to measure the fuel pressure to be sure. Normally, when the fuel pressure is getting lower, the PCM will compensate for this by increasing the fuel injector pulse width. You can see this by checking the LTFT (long term fuel trim) with a scanner, which will go up above the +10%, until it reaches +20%, and you get the check engine light for a mixture too lean.
Your problem could eventually be with the TPS or even the crank position sensor. Also known for the 4.0 engine is the cable loom which runs behind the cylinder head. It can rub against a stud, causing the wire isolation to be damaged, which can cause a short.
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Old 02-06-2017, 11:43 AM
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Re: 01 WJ slipping?

Well I just put a new crank sensor on so it wouldn't be that. Now it's getting worse. After it gets warmed up when I'm just idoling around the parking lot it goes from the normal 1000 rpm to 500 or 300 like it's about to die and does that back and forth until it does die.


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Old 02-06-2017, 11:56 AM
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Re: 01 WJ slipping?

Now it's throwing a p1282 code


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Old 02-06-2017, 04:20 PM
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Re: 01 WJ slipping?

The P1282 code means that there is a problem in the fuel pump relay circuit. I would swap the fuel pump relay with a same one in the PDC under the hood. Also remove the fuel pump fuse and check for corrosion on the pins and the slots. (fuse #24 in the PDC and fuse #12 on the junction block under the dash.)
The erratic idling could have to do with a dirty idle air control stepper motor plunjer. If not done recently, i would clean the throttle body and the IAC plunjer.
Also a bad TPS can cause idle surge. A scanner would show this, since at idle the TPS should be a fixed value. With a bad TPS, the idle % will be jumping around.
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Old 02-06-2017, 04:24 PM
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Re: 01 WJ slipping?

Alright will do. I've been looking around forums and a lot of ppl have had this issue with they're pcm. I ordered one of those. I will check this stuff as well. Hopefully one of those is the problem and I can send it back


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