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Unread 05-07-2010, 08:10 PM   #16
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,740
Maybe the ECM will fix it. The tach going crazy with no other gauges jumping around sounds like the crank or cam sensor, but could possibly be the ECM. I think everyone with a ZJ any year model should have a spare ECM/PCM for troubleshooting purposes. The OEMs are at the end of their service life.

I found that the connection to the cam sensor was flakey on mine. Best thing to do is wiggle all the connections around while it's idling and see if you get a stall.

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Unread 05-07-2010, 08:48 PM   #17
lasvegas
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1995 ZJ 
 
Join Date: Oct 2009
Location: california
Posts: 96
That's a good idea. When my PCM gets back, even if it does run good, I will jiggle wires around a little to make sure all is good. I am checking all my grounds while the PCM is being fixed too.
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Unread 05-08-2010, 08:49 AM   #18
schizm99
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1989 YJ Wrangler 
 
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I had a BroncoII that had this same problem.. Being a standard it drove off by it self one rainy night!! (true)
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Unread 05-08-2010, 10:22 AM   #19
Midnightluckey
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1995 ZJ 
 
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Quote:
Originally Posted by schizm99 View Post
I had a BroncoII that had this same problem.. Being a standard it drove off by it self one rainy night!! (true)
That would suck so freaking much. What happened to it? Tree?
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Unread 05-09-2010, 09:35 PM   #20
classicmetalman
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Quote:
Originally Posted by lasvegas View Post
Just an update if any of you are looking for a "MOPAR ORIGINAL" part for a reasonable price.
I called them and they assured me this was a Mopar part. The dealer wanted $120.00 plus tax!

Original Replacement Parts 56027280 - Crank Position Sensor for 93-96 Jeep® Grand Cherokee ZJ with 4.0L Engine & Automatic Transmission - Quadratec
Good find if true
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93 Laredo 4.0
96 Limited 4.0

Quote:
Originally Posted by murphydajeep View Post
I say you should still hit something just to let it know you mean business, or shake a hammer at it in a menacing fashion
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Unread 05-10-2010, 08:56 AM   #21
lasvegas
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Curious to know how many mile people are getting on their JPC 4.0 before it blows
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Unread 05-10-2010, 09:46 AM   #22
dels383ta
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1996 ZJ 
 
Join Date: Apr 2008
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Posts: 122
Quote:
Originally Posted by lasvegas View Post
Just an update if any of you are looking for a "MOPAR ORIGINAL" part for a reasonable price.
I called them and they assured me this was a Mopar part. The dealer wanted $120.00 plus tax!

Original Replacement Parts 56027280 - Crank Position Sensor for 93-96 Jeep® Grand Cherokee ZJ with 4.0L Engine & Automatic Transmission - Quadratec
Quadratec Gets there parts from CROWN Automotive, who are a dealer of nothing but Jeep parts, and they are all factory replacement I am told. But they dont sell to the public, have to be a business to buy from them.
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Unread 05-16-2010, 11:11 PM   #23
lasvegas
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1995 ZJ 
 
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PCM Rebuilt...still shutting off!!!

Well, I got my PCM back and put it in and cleaned all my ground wires and even replaced one of them....nothing! It started up great and ran for about 15-20 min. then tach went crazy then shut down. CE light came on so I checked the codes with the 3 turns method and NO codes. ??? Do these GC's have an ignition module? My van did the same thing and that fixed it years ago. HHHEEEEELLLLLLLPPPPPPP!
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Unread 05-18-2010, 12:14 PM   #24
lasvegas
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1995 ZJ 
 
Join Date: Oct 2009
Location: california
Posts: 96
O.K., so I got my computer back and it started up and ran GREAT! BUT......I had to disconnect the battery to fix some of the wires on the stereo (just being safe) and when I finished I reconnected the battery and heard a little pop. Now it's back to running like crap and shutting off. I know what your thinking...why didn't you fix the radio when the PCM was out being fixed? Stupid here has been so busy doing other things that I forgot about it. So this weekend A friend and I are going to fix it. Anyone had this happen?
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Unread 05-18-2010, 12:45 PM   #25
fireemsjeep
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1993 XJ Cherokee 
 
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Did you check all your fuses??? If you heard a pop that might be a fuse ending its life.
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Unread 05-18-2010, 02:48 PM   #26
lasvegas
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Checked them all...all look good...this sucks! LOL
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Unread 05-18-2010, 08:12 PM   #27
classicmetalman
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Relay maybe?
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93 Laredo 4.0
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Quote:
Originally Posted by murphydajeep View Post
I say you should still hit something just to let it know you mean business, or shake a hammer at it in a menacing fashion
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Unread 05-18-2010, 08:47 PM   #28
lasvegas
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1995 ZJ 
 
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Location: california
Posts: 96
Switched relays between A/C and Fuel Pump thinking that too....no luck. Thanks though
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Unread 05-18-2010, 08:51 PM   #29
fireemsjeep
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Posts: 316
get a shot gun and shoot at it. it might be the best option at this rate.
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Unread 05-23-2010, 01:10 PM   #30
dmask0
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1977 CJ5 
 
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hey lasvegas,
i have '98 4.0 with all the same probs as yours... went through changing all the same parts, including the new computer ($$$). jeep drove fine for about a day with the new pcm (i was so freaking happy), but then it stalled again in an intersection (my heart dropped through to the floor). lucky me i got a code, so i limped straight to AZ and got the O2 lean bank reading.
i put in a new front (mopar) O2 sensor (rumors suggest they don't care for the less expensive ones for very long), and all my problems have been solved for the past 6 months. no more stalling, hesitation, etc.
btw, i didn't bother to change the rear O2 sensor yet (i'm cheap), but i'll get to it sometime this summer.
hoping this might help you, too. good luck.
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engine , ignition , shut off , stall

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