4.7 dying without warning - Page 2 - JeepForum.com
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post #16 of 23 Old 11-09-2013, 04:24 PM
rdkendrick
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If it's only happening while hot, then it probably is your ECM. A few other users were going through the same thing, changed crank sensor, cam sensor, TPS, etc. they finally replaced their ECM with a used, reflashed one and it solved their problem.
TIMBOB, I think was one of them. ZEPHYR was another.

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post #17 of 23 Old 11-09-2013, 10:10 PM
Brian_lee86
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did the map sensor this morning then we went and clocked 300 miles with no issues to speak of i'd say my problem was the MAP, let me know what happens with yours i should add that the MAP sensor from the jeep commander has nearly identical part number and is also a 4.7l so my lesson learned here was double check part numbers (case in point Commander 4.7 MAP 56041018AD vs Grand cherokee 4.7 56041018AB)

Last edited by Brian_lee86; 11-12-2013 at 06:43 PM.
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post #18 of 23 Old 11-10-2013, 06:08 AM
86cj74.2L
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To the original poster to me you seem to have two problems. One associated with the stalling when stopped and one with engine cutting out while driving.

If your gauges all zeroed then went to normal that's a PCM com's or loss of power to me. Or your ultra gauge is pounding the PCM for data and locking it up / clogging the data bus with parameter requests. (PID requests to be exact)

You could remove the ultra gauge from the OBD port and see what happens.

Stalling at intersections had always been a Throttle body remove and clean.
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post #19 of 23 Old 11-10-2013, 05:03 PM Thread Starter
Russell84
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I'll unplug the Ultra Gauge and see if that helps at all.

-Rusty

2003 WJ Overland 4.7 HO, Clayton Long Arms, Teraflex 4.5" coils, JKS adj trackbar, JKS Quicker Discos, 17x9 Eagle Alloy Series 185, 285/70/17 BFG KM2, cut fenders/bumpers
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post #20 of 23 Old 11-12-2013, 12:28 AM Thread Starter
Russell84
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So I unplugged the Ultra Gauge and it hasn't died on me again. And the CEL came back on shortly after (for the same EVAP code I've had since I bought the Jeep), so apparently it was interfering with the computer somehow. Kinda disappointing that its causing problems, since it's a very handy little gizmo. Guess I'll call them tomorrow and see if I can figure out why it's doing this. Going to give it a week or so before I'm confident that was really the problem, but its looking good so far.

-Rusty

2003 WJ Overland 4.7 HO, Clayton Long Arms, Teraflex 4.5" coils, JKS adj trackbar, JKS Quicker Discos, 17x9 Eagle Alloy Series 185, 285/70/17 BFG KM2, cut fenders/bumpers
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post #21 of 23 Old 11-12-2013, 04:06 AM
86cj74.2L
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Is it programmable? When devices request PIDs the devices address determines the priority.

I think the PCM and all the factory devices are like.......1 and anything plugged into the OBD port should be address 2 or something.

My scangaugeII (I'm pretty sure can be changed) is selectable I think but default is a lower priority. And it has a low, normal and fast update time.
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post #22 of 23 Old 11-12-2013, 09:09 PM Thread Starter
Russell84
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I'll have to take a look at the device settings and see if there's something I can adjust on it so it doesn't interfere with my computer. Like I said, it's super handy, but not if it makes my Jeep die.

-Rusty

2003 WJ Overland 4.7 HO, Clayton Long Arms, Teraflex 4.5" coils, JKS adj trackbar, JKS Quicker Discos, 17x9 Eagle Alloy Series 185, 285/70/17 BFG KM2, cut fenders/bumpers
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post #23 of 23 Old 11-12-2013, 09:12 PM
link375
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mine just started shaking this morning while waiting for a meal at a drive tru, then then CEL came on and threw out a P0152 code. for one of the O2 sensors.

the shaking or sputtering thing is what usually happens before it dies on me, I'm not sure if this is helpful to any of you
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