WJ Grand Cherokee Stalling and stumbling - JeepForum.com
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Unread 09-24-2013, 07:45 AM   #1
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Join Date: Sep 2013
Location: Beavercreek, Ohio
Posts: 2
WJ Grand Cherokee Stalling and stumbling

I'm brand new to this forum as a member but have read many posts on this topic...but still can't get the problem figured out.
History...2002 Grand Cherokee 4.0L with 201,000 miles. Recently she's been intermittenly stumbling and after it warms up will stall out without warning. Mine, unlike others that I have read about will start right back up. It doesn't do this on every (cycle) or start but does it at least every other start. I did the key switch code retrive thing and now an getting the P0340 code which I think is the camshaft sensor.
I've replaced in the last 2 weeks:
camshaft sensor
crankshft position sensor
throttle position sensor
battery terminals cleaned and battery checked out good.
6 new APP985 plugs installed.
It's still acting up??
Now, I didn't use OEM Mopar parts..could I have got a bad sensor?
I've heard guys say replacing the PCM is a fix?
Any advice would be great!

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Unread 09-25-2013, 07:24 PM   #2
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Join Date: Sep 2013
Location: Beavercreek, Ohio
Posts: 2
I pulled the aftermarket cam position sensor and bought a Mopar part...exactly the same part and part number by the way...$30 more!
Went for a long test ride and about 15 minutes in, stalled out again...
Also tonight I did the zip tie, deoxit cleaning on the PCM connections. Only drove around neighborhood but never stalled..check engine light came back on..p0340?? Cam sensor.
Could it still be the crank sensor? Maybe the Auto parts store unit is bad? Could I need a new PCM?
Anyone...running out of options!?
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Unread 09-25-2013, 08:50 PM   #3
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2002 WJ 
Join Date: Jan 2012
Location: Orange county, CA
Posts: 781
Try resetting the PCM:
To do this you touch your positive battery CABLE end to engine block ground --or you can disconnect your battery for about 12 hours for same results.
Grab some jumper cables> Disconnect the positive battery cable from battery> clamp one jumper cable lead to it(the positive battery cable end you just disconnected from battery) and connect the other end/lead to your engine block--engine mounts work good and leave there for around a minute. Reconnect positive cable to battery> turn ignition switch forward to ON position (just shy of cranking engine) > Turn headlights on then off and then turn key off.

Your PCM is now reset.
Drive it around the block a few times while it "recollects data from your engine sensors."
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Unread 02-06-2014, 05:40 PM   #4
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Join Date: May 2013
Location: Williston, ND
Posts: 1
1999 grand cherokee stumbling

I have had this same stumbling from 2 4.0 GCs. The computer has corrected this in the past but it has come back after 6mos. I cannot tell if its a fuel pressure or ignition problem.It seems It just started again while driving in the deep Michigan snow today white in part time transfercase. I have already replaced the ECU with a rebuilt unit and thought the problem was corrested. This is a southern vehicle and its first snow duty. Do these GCs have a known history of ECU related problems. I hate to just keep on replacing them if maybe an additional ground or mod may be helpful.

Thanks in advance lilalleykatt

Last edited by lilalleykatt; 02-06-2014 at 05:41 PM.. Reason: typo
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Unread 02-06-2014, 06:41 PM   #5
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2002 WJ 
Join Date: Jun 2011
Location: Independence, MO.
Posts: 192
MAP sensor? That was the problem on my wifes 99 GC.
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Unread 02-06-2014, 08:33 PM   #6
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1998 XJ Cherokee 
Join Date: Feb 2014
Location: Warsaw, IN
Posts: 55
Maybe oxygen sensors? A friend had a very similar problem and that's what did it for him. You could also try cleaning your throttle body and IAC. That helped mine out a lot.
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