12 Things You Can Do When Your ZJ Stalls - Page 9 - JeepForum.com

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post #121 of 435 Old 09-06-2013, 01:23 PM
jeepgal2k12
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I have so far had two bouts of stalling.

I did so much the first time, I can't say exactly what solved it.

This time I took out the pcm. I took out the screws (t15) and reinstalled them with 1/4 inch washers. Then i zip tied the connectors again. Hopefully, this fixes it!


1996 jeep grand cherokee laredo 2wd
240,xxx miles 4.0L i6
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post #122 of 435 Old 09-06-2013, 01:47 PM
Uniblurb
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Quote:
Originally Posted by jeepgal2k12 View Post
I have so far had two bouts of stalling.

I did so much the first time, I can't say exactly what solved it.

This time I took out the pcm. I took out the screws (t15) and reinstalled them with 1/4 inch washers. Then i zip tied the connectors again. Hopefully, this fixes it!
The zip ties on the PCM connectors may help but spacing those screws out further isn't going to do anything. It's nothing but a myth of bad info going around the PCM screws are too long which causes problems! Believe that fairy tail is already mentioned in this thread.

But do wish you luck in finding your problems and you many want to start at the beginning of this thread.

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 93 4.0 XJ (spare), 96 4.0 XJ (son's)


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post #123 of 435 Old 09-06-2013, 11:38 PM
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Update. Checked all systems for something grounding out that shouldnt be. All looked Ok, so I swapped out the PCM ( A1-Cardone) for a new one under warranty. ( my 4th PCM) Drove it all afternoon without a hiccup and the gas mileage is even improved ( according to the overhead console). Will update this post after 200 miles of flawless performance....if I'm lucky. In the meantime, I think I'm going to go have the alternator rebuilt by someone I whom I know and trust, then install another brand new battery that's NOT a cheapo from Walmart, just to be safe. Maybe I can go another whole year without this issue rearing it's ugly head this time.
As for now..it was the PCM...but only time will tell.

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #124 of 435 Old 09-06-2013, 11:45 PM Thread Starter
ZeeJay1997
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When my one of my PCMs went out, i found that one of the brushes in the alternator had worn almost completely to the spring and was sitting crossways. I really dont know how it was working at all. I went to the local auto electric shop and bough a set of brushes for 15 bucks and replaced them. 60k later, I still have original alternator.


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post #125 of 435 Old 09-07-2013, 02:07 AM
cgcarpenter
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So signs pointing to my PCM now.

As soon as I started her today I went user the hood and wiggled everything I could.
And got to the PCM and could almost make her stall by giving some decent pressure down on the middle connector. BUT after a couple bouts and stalling once or twice it stopped. So I'll try this again tomorrow. Maybe the wiggle test only works on cold starts. Like I said I'll check tomorrow.
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post #126 of 435 Old 09-07-2013, 03:23 AM
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It's MY theory ( and it's ONLY a theory) that IF you can make it stall by wiggling the PCM connectors, the PCM needs replacing or taken apart and a re-soldering job be performed on the cold/cracked solder points on the PC board.

I will only add this: I replaced both o2 sensors ( NTK) a month ago and it seemed to get worse..whatever THAT means, if anything.

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #127 of 435 Old 09-07-2013, 04:02 AM
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Sounds like a logical theory Oldfrog and it's like using the zip ties to push the connectors in is only a temporary fix where the solder joints may be cracked.

Glad you finally got yours running with another PCM replacement! A little odd when you replaced your o2 sensors your problems became worse. I've had a brand new NTK upstream sensor sitting down the basement for a year and I'm half afraid to install it. When things are running pretty descent, like mine is, it may be best to just leave it alone.

I'm still learning from Zee and never would have considered installing new brushes in an alternator instead of just installing a new or rebuilt one. If my 10 year old replacement start failing I'll now consider diy.

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 93 4.0 XJ (spare), 96 4.0 XJ (son's)


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post #128 of 435 Old 09-07-2013, 09:14 AM Thread Starter
ZeeJay1997
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Quote:
Originally Posted by Oldfrog View Post
It's MY theory ( and it's ONLY a theory) that IF you can make it stall by wiggling the PCM connectors, the PCM needs replacing or taken apart and a re-soldering job be performed on the cold/cracked solder points on the PC board.

I will only add this: I replaced both o2 sensors ( NTK) a month ago and it seemed to get worse..whatever THAT means, if anything.
Your theory still has some unaddressed variables. They are covered in the dirty dozen

Those PCMs do get PMS


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post #129 of 435 Old 09-07-2013, 09:20 AM
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Quote:
Originally Posted by Uniblurb View Post
I'm still learning from Zee and never would have considered installing new brushes in an alternator instead of just installing a new or rebuilt one. If my 10 year old replacement start failing I'll now consider diy.
Here's a write up someone did a few years back.

http://www.jeepforum.com/forum/f11/r.../#post13862867
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post #130 of 435 Old 09-07-2013, 02:18 PM
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Quote:
Originally Posted by JS97ZJ View Post
Here's a write up someone did a few years back.

http://www.jeepforum.com/forum/f11/r.../#post13862867
That looks like a real good alternator rebuild write-up w/nice photos. Thanks for the link JS!

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 93 4.0 XJ (spare), 96 4.0 XJ (son's)


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post #131 of 435 Old 09-07-2013, 02:48 PM Thread Starter
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JS has the scoop on all the good stuff.


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post #132 of 435 Old 09-07-2013, 03:14 PM
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I don't know about that Zee,...... you've got a good list there yourself.

I've been organizing my favorites list to make it easier.
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post #133 of 435 Old 09-15-2013, 06:05 PM
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Regardless, here's an update on my... let's see now....how many PCMs has it taken ?..... The original, the one from the Florida rip-off guys, one Cardone ( that one lasted 11 months), the replacement Cardone ( that one never was really "right" from day one) and this second replacement Cardone. That's FIVE PCMs. Two of which I paid for.

But....I managed to clear up quite a few small issues before I installed #5. The main one being the downstream O2 sensor which has been in there for a long time. Not the original one for sure...but it's been several years. One thing I did NOT do this time, was cinch the connectors down too tight with zip ties. I simply pulled them "snug" and didnt apply that last little bit of muscle to them, which may have contributed to the premature solder joint failure.

150 miles and not a hiccup since the new PCM.

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #134 of 435 Old 09-16-2013, 08:32 PM Thread Starter
ZeeJay1997
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Quote:
Originally Posted by Oldfrog View Post
One thing I did NOT do this time, was cinch the connectors down too tight with zip ties. I simply pulled them "snug" and didnt apply that last little bit of muscle to them, which may have contributed to the premature solder joint failure.
There's usually no reason to use zip ties unless you suspect ta connection problem. I'm probably pushing my luck, but center connector has both lock tabs broken off and I'm not using them. Mine is a highway queen though. Of course , I do have some respectable potholes that present a challenge to the cream puff 2wd unit.


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post #135 of 435 Old 09-18-2013, 07:09 PM
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this thread was done so well and long ago with so many hits and still aint a sticky? wtf ive been around for a lil bit so luckily had seen it and could find it when i needed it.....(today), but newbies should be able to find this right away!

great writup zee. im working my way through my a.d.d. to get down the list but i think i need not go much farther then #1 so far!

COME ON MODS

STICKY!!!

96 ZJ sittin up 6" on 35's with 4:56's and a 12k winch. Cuz...why the hell not!?
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