- #110 of 119
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Re: PCM Module Replacement [mercyme6]
by jeffwtuttle
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Oct 24, 2009 (6:58 am)
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Replying to: mercyme6 (Sep 20, 2009 2:24 pm)
be sure that you get the pcm that has a security or non security on it. There are TWO (2) types..If you need one I have one here that I will never use because after much bs from the dealer it just turned out to be the coil...just to be safe replace it not just have it tested..its only 20 bucks at a auto parts store..cheep!
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- #111 of 119
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Starting trouble pattern?
by peteinnh
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Oct 27, 2009 (2:48 pm)
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New to the site. I have a 1994 Jeep Grand Cherokee Laredo 6Cyl/ 4x4. I suspect the PCM but the following has puzzled me. The car starts and runs for 12 minutes and abruptly dies. Restart attempt(s) shows no spark. Strong cranking power, relays energize - but nothing. Three days later the same pattern - starts- runs for 12 minutes- dies and then I must once again wait three more days to hear it run again!! (in those 12 mins it sounds dynamite!)
Car has new fuel pump/ gas tank/ battery/alternator (replaced over time with none of these items over two years old). car has had regular tune ups and oil replaced at every 5K
I think the PCM at fault but I am not to experienced with the many sensors the car has on-board. I wonder if a faulty sensor could be triggering the shut down and hope to lean on someone with more experience before dumping $300.00 on a new PCM
Any help or direction would be MOST appreciated. Thanks in advance for any possible suggestions to resolve my issue.
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- #112 of 119
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Re: Starting trouble pattern? [peteinnh]
by mercyme6
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Oct 27, 2009 (8:38 pm)
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Replying to: peteinnh (Oct 27, 2009 2:48 pm)
hi, i have a 93 jeep and i replaced my pcm for $80 off ebay motors go there first, it ran great for 2 weeks and then had to replace throttle position sensor at advanced auto for $35 with warranty now the jeep has a temperature problem with starting at certain times so my mechanic says try putting in new spark plugs becuz the older jeeps need certain spark plugs and he thinks the wrong spark plugs are in the jeep now go platinum not the cheapy ones either.hope this helps,having problems too.
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- #113 of 119
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Re: Starting trouble pattern? [mercyme6]
by mercyme6
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Oct 27, 2009 (8:56 pm)
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Replying to: mercyme6 (Oct 27, 2009 8:38 pm)
also found pcm on ebay for you but this is the guy i bought mine off of and i wealed dealed with him he wanted 95 plus shipping so i offered him 80 with him paying for shipping. and he did it.so here is the website to go to,
phttp://myworld.ebay.com/ebaymotors/wegotyourpart/aying
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- #114 of 119
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Re: Starting trouble pattern? [peteinnh]
by mercyme6
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Oct 28, 2009 (7:41 am)
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Replying to: peteinnh (Oct 27, 2009 2:48 pm)
hello again, i just got an email from ebay member and he wants to know what your pcm number is, he does have one for you 1994 but wants to know what the numbers are and see if they are compatible here is the ebay guys email
eBay Member: oldtowman"
the other webisite i listed for you is the one i actually bought mine from so here is either one that has a 1994 pcm good luck
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- #115 of 119
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Re: Starting trouble pattern? [mercyme6]
by peteinnh
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Oct 28, 2009 (7:53 am)
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Replying to: mercyme6 (Oct 27, 2009 8:56 pm)
Thank you so very much for this information. I will obtain the info and be in touch with him. Thanks again!
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- #116 of 119
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Re: Starting trouble pattern? [peteinnh]
by jenel10
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Oct 28, 2009 (11:21 pm)
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Replying to: peteinnh (Oct 28, 2009 7:53 am)
I have a 2001 JGC Limited...love it...hit animal and punctured radiator...thank god for comp insurance. Replaced radiator...drove for 20 miles...overheated...fluid pouring out of the bottom. Towed back to the service place...coolant everywhere under the hood. Impellor broke on water pump...coolant backed up in overflow and then sprayed out hose for overflow...replaced everything on the cooling system....driving home tonight...car stalled out....had electrical power to everything.....pulled over...tried to restart....acted as if it was flooded. sat for a few minutes...started up.....Drove another 20 miiles....same thing...tach to zero....had electrical power.....restarted right away....while driving again it jerked and a few minutes later...stalled out. Had got gas and thought it was bad gas....filled tank and added dry gas.....droveit all the way home...stalled pulling in driveway. It acts as if it is not getting enough gas.....any thoughts?
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- #117 of 119
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Re: Starting trouble pattern? [jenel10]
by peteinnh
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Oct 29, 2009 (5:57 am)
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Replying to: jenel10 (Oct 28, 2009 11:21 pm)
I am not a mechanic but this sounds like a PCM. My other Jeep had the same issues - replaced gas tank / fuel pump (obviously fuel filter and spark oplugs were also replaced) and the stalling out issue wasnt resolved until the PCM was replaced. Good luck
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- #118 of 119
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Re: Starting trouble pattern? [jenel10]
by tuggajb
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Oct 29, 2009 (2:01 pm)
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Replying to: jenel10 (Oct 28, 2009 11:21 pm)
the computer sits right by the overflow tank on this jeep has a big bundle of cables hooked to the computer with bolt in the center of plug in
unhook the battery and remove the plug of wires use clectric cleaner to clean contacts put dilectric greese on contacts put back together should work
think you got antifreeze mix inside conector
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- #119 of 119
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93 jeep still starts when it wants to
by mercyme6
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Oct 30, 2009 (9:05 am)
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well, replaced the pcm like i said then replaced the throttle position sensor and cleaned throttle body which wasnt that dirty, but that darn jeep only wants to start at certain times,its weird it will start sometimes in the heat but when it gets cold it wont but then other times it starts when its cold out havent replaced spark plugs yet thats the next thing, any thoughts on maybe the fuel pump?i was really trying to avoid the fuel pump replacement idea but might have to.
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