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Unread 07-05-2013, 11:41 AM   #1
reynoldsjp
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1998 ZJ 
 
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Just got replacement PCM

I bought a used PCM for my 98 Grand 4.0 on Ebay. I got it today. Anything special putting it in ? Just make sure battery cables are undone and put it in then hook battery up ? It has exactly the same number as my old and security built in as well. Any help asap is greatly appreciated. I am excited to see if I can get this moving after sitting for almost a month due to lack of funds.

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Unread 07-05-2013, 11:47 AM   #2
dellis
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Quote:
Originally Posted by reynoldsjp View Post
I bought a used PCM for my 98 Grand 4.0 on Ebay. I got it today. Anything special putting it in ? Just make sure battery cables are undone and put it in then hook battery up ? It has exactly the same number as my old and security built in as well. Any help asap is greatly appreciated. I am excited to see if I can get this moving after sitting for almost a month due to lack of funds.
Did you get the VIN and mileage programmed into it? My understanding is that beginning with the 98 model year, the VIN has to be programmed into the PCM for it to work (since the mileage is stored in the '98s PCM, I suppose there's some sort of Federal law that requires a sanity check on the VIN).
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Unread 07-05-2013, 11:58 AM   #3
dakimbrough
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Great PCM Change

Just remember to add your mileage to the PCM before installing.
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Unread 07-05-2013, 12:04 PM   #4
reynoldsjp
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How do I get that done is it expensive ? Can I run it without getting that done and not have any problems other than mileage display ?
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Unread 07-05-2013, 12:35 PM   #5
ZeeJay1997
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talk to Coralman, he has a 98. IIRC it will work with no programming. put it in to see if it works.
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Unread 07-05-2013, 12:55 PM   #6
reynoldsjp
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Ok. So I put it in hooked battery back up. My jeep started right up ! Actually the best start it has ever had. No hesitation or cranking before starting just started right up. Mileage was correct and security works. Thanks to all for quick responses and help. I am going to drive it for a few days and see if my stalling issues have gone away. Until the next item breaks I bid you farewell.
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Unread 07-05-2013, 01:28 PM   #7
dellis
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Quote:
Originally Posted by reynoldsjp View Post
Ok. So I put it in hooked battery back up. My jeep started right up ! Actually the best start it has ever had. No hesitation or cranking before starting just started right up. Mileage was correct and security works. Thanks to all for quick responses and help. I am going to drive it for a few days and see if my stalling issues have gone away. Until the next item breaks I bid you farewell.
Good for you! Looks like I was wrong ...
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Unread 07-05-2013, 02:27 PM   #8
MeanGreenZJ
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Goes to show how much bad info gets passed around.
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Unread 07-05-2013, 02:30 PM   #9
dellis
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Originally Posted by MeanGreenZJ View Post
Goes to show how much bad info gets passed around.
If you note, my guidance on programming was softened (because I just didn't have any personal experience with it) ... but, I had felt it was fairly reliable since it was once posted by ratmonkey.
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Unread 07-05-2013, 03:54 PM   #10
coralman
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I referenced the info about 98's before, because I had heard that it needed the vin programmed. But, on the last cardone I got under warranty it was not vin programmed if I remember correctly. I have a backup that was rebuilt by another company and even though they asked for the vin I have no idea if it was actually entered. It would be interesting to see if the OP's vin is original or not using a drb.
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Unread 07-05-2013, 06:21 PM   #11
reynoldsjp
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Well I have been driving it all day and no issues so far. I hope this is truly the end of the stall issue. Is there a place that buys old ones for remanufacturing ? I took it buy the wash and got it all cleaned up. So at least for now I'm back on the road.
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Unread 07-05-2013, 08:22 PM   #12
ZeeJay1997
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Quote:
Originally Posted by reynoldsjp View Post
Is there a place that buys old ones for remanufacturing ?
i dont know of one. rat hole it, maybe you can use it for a core sometime... or take it apart and try to fix it.
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Unread 07-05-2013, 08:40 PM   #13
Oldfrog
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What I've come to learn about the 96-98 PCMs for the 4.0 is that quite often, there is something else wrong in the system that fries them. Not always....but often. For instance, myself having a background in electronics, I know that the making and breaking of poor power connections ( usually grounds) will wreak havoc on integrated circuits and certain discreet components.

Yes, I believe that some of the PCMs were just plain crap to begin with...but others have been fried... and much too easily, if you ask me.

Keep the old one....if might get you home one night if it works at all...
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Unread 07-05-2013, 08:44 PM   #14
ZeeJay1997
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OP, Oldfrog makes a good point. It would be a good idea to disconnect the battery and clean the grounds on side of the block
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Unread 07-06-2013, 12:29 PM   #15
dakimbrough
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jeepgrandcherokeepcm.com......Great website for PCM .
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