04 jeep grand cherokee just dies - Page 3 - JeepForum.com

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post #31 of 79 Old 09-09-2013, 11:36 AM Thread Starter
cmberges
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MAP sensor on the way. I hope that is it..... ;-)

Thanks again guys. I'll keep you posted.

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post #32 of 79 Old 09-12-2013, 01:43 PM Thread Starter
cmberges
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OK so here it goes.

Changed the MAP sensor and drove it to the gym (not to hot out today) and turned it off, went just fine. Fired it right back up an came home (3-4 miles) and ran great, let it run for about 10 more min, then took it up and down the block, drove just fine. Sat it in the driveway for another 10 min and it died......DAMN IT......

Did the key thing, no codes. Unhooked and grounded the battery and it fired right back up (never has done that before).

So now is it pretty much narrowed down to the PCM (computer)?????

This thing is pissing me off.
Thanks
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post #33 of 79 Old 09-12-2013, 05:23 PM
rdkendrick
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Quote:
Originally Posted by cmberges View Post
OK so here it goes.

Changed the MAP sensor and drove it to the gym (not to hot out today) and turned it off, went just fine. Fired it right back up an came home (3-4 miles) and ran great, let it run for about 10 more min, then took it up and down the block, drove just fine. Sat it in the driveway for another 10 min and it died......DAMN IT......

Did the key thing, no codes. Unhooked and grounded the battery and it fired right back up (never has done that before).

So now is it pretty much narrowed down to the PCM (computer)?????

This thing is pissing me off.
Thanks
Starting to sound like it. Here's a PCM Exchange company I saw on eBay.
http://www.ebay.com/itm/170875865756

Sent from my iPad using my fingers
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post #34 of 79 Old 09-12-2013, 06:20 PM
BrokeWJ
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Mine has had a couple times it died and would not start right.

First, when the battery was weak- gas pedal to 3/4 it started and drove fine.

Second, when first VSS went bad (second went at same time admittedly). When both were bad, it'd stall and have to use gas pedal a bit to start it and would have to keep idle up to keep from stalling at a stop. When only the second was bad, it would rarely stall but usually started right back- sometimes had to put gas pedal down a bit to start it immediately.

I don't remember if it started without codes, but upon replacement of each it had codes. My recollection is that the VSS issues tripped P0700/P0701 (think that's what the Misc trans code is) the whole time they were bad. I'm not even close to 100% sure there's any relation- but even on an MPFI motor, try playing with the throttle in a hard start attempt- pumping it is worthless, but steady pressure isn't necessarily.
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post #35 of 79 Old 09-12-2013, 08:46 PM
StormChaserTim
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This is what we found with mine. Check out the datalog:


You can see on the left side, the engine idling just fine, no problem, then...nothing. Couple of seconds later, it comes right back, and you can see the flat lines, showing the engine isn't running. As we move to the right, the lines start getting squiggly, that's where I cranked it back up.

Narcolepsy at it's finest.

Sorry the MAP sensor didn't solve it. I'm still waiting on my replacement PCM to see if I got a good one or not, LOL. I'll post back when I do, after I have put several hundred TROUBLE FREE miles on my Jeep.

Tim

2000 Grand Cherokee Limited 2wd, 4.7L V8 - It's blazing fast, blue, and the heap of Jeep.
2002 Dodge Ram Quad Cab 2wd, 4.7L V8 - Hailstoned, windshield cracked, storm chasin' truck. But dependable.
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post #36 of 79 Old 09-12-2013, 11:15 PM
new2site
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Yeah... like I had mentioned sounds like your PCM....
Check and clean all your grounds first...see if that takes care of it..

Some other guy recommend the same company on Ebay that Rdkendrick listed..

http://www.ebay.com/itm/170875865756

http://www.jeepforum.com/forum/f310/...03-gc-1265424/
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post #37 of 79 Old 09-13-2013, 08:25 AM Thread Starter
cmberges
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Well guess im spending another $150 on this thing. It better run............
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post #38 of 79 Old 09-13-2013, 12:55 PM
rdkendrick
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Quote:
Originally Posted by cmberges View Post
Well guess im spending another $150 on this thing. It better run............
I sure hope I don't run into that problem (knock on wood).

Sent from my iPad using my fingers
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post #39 of 79 Old 09-15-2013, 02:14 PM
new2site
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Quote:
Originally Posted by cmberges View Post
Well guess im spending another $150 on this thing. It better run............
I feel your pain...
Any update on your situation...did you pay for replacement PCM yet? ...shipping status?
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post #40 of 79 Old 09-18-2013, 10:02 AM Thread Starter
cmberges
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Ordering today and will keep the page updated and not leave everyone hanging...
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post #41 of 79 Old 09-18-2013, 02:59 PM
deandec
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I stopped at a store. Would not restart. No warning.

Opened the hood, wiggled the little electric wire connection at the top of the alternator.

Started right up with no further problems (2 days of driving)....so far I feel like I am a mechanic now

Dean
99 and 05 JGC 4.7L
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post #42 of 79 Old 09-18-2013, 04:13 PM
rnorwegian
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I just had the same problem, turned out to be the camshaft position sensor

2002 WJ
4.7L, K&N intake, 3" pipe from cat back
Rough Country 4" X-Series
Procomp Series 7069 alloys 16x8
BFG 265/75 Mud Terrain KM2
8000 lb recovery on home built mount
( front bumper under construction)
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post #43 of 79 Old 09-18-2013, 05:22 PM
nolimitssjca
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StormChaserTim What logging tool are you using?
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post #44 of 79 Old 09-18-2013, 05:27 PM
StormChaserTim
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We're using this datalogger:
http://www.innovatemotorsports.com/products/lm2.php

And this software on a netbook to analyze:
http://www.innovatemotorsports.com/p...s/logworks.php

Both are a kit in the $479 package, BTW. Good tool for finding pesky issues like this.

Tim

2000 Grand Cherokee Limited 2wd, 4.7L V8 - It's blazing fast, blue, and the heap of Jeep.
2002 Dodge Ram Quad Cab 2wd, 4.7L V8 - Hailstoned, windshield cracked, storm chasin' truck. But dependable.
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post #45 of 79 Old 09-18-2013, 08:51 PM
new2site
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He already replaced the CkPS and wasn't pulling any codes to begin with.... 90% it's his PCM.
He could have the same symptoms with a bad CmPS but once again...no codes pointing to that either.
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