1995 Jeep Grand Cherokee Limited i6 4.0 infamous stalling problem - JeepForum.com
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Unread 03-24-2011, 11:04 PM   #1
sirwilliam706
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1995 ZJ 
 
Join Date: Mar 2011
Location: Martinez, Ga
Posts: 21
1995 Jeep Grand Cherokee Limited i6 4.0 infamous stalling problem

hey i am new to the site but really value forums like this i use one for my truck and unfortunately the problem is with my wife's jeep so you can imagine the added stress of her patience getting thin. her jeep will run great when cold and on short trips but on some of the longer trips it acts like it wants to run out of gas kinda like a missfire really dont know words to describe rpms drop no power (no matter how much gas you give it) it only does it every so often but after you let it cool of you can crank it and drive it like normal. I have read alot of the threads post by post bout there is so many things it could be i have not found any post that matches my symptoms to a tee but close my engine has never shut off even when it is acting up if i stop and let it idle its a little rough but never shuts off. I obviously did a full tune up thinking that was the problem but no avail. I am no dummy when it comes to working on cars i can handle my own just looking to bounce some ideas and see if any one else has had the same problem. Here is the stuff that i replaced:

fuel filter
plugs
wires
rotary button
distributor cap
ccv valves and hoses
air filter
trans control mod
cleaned iac and tb
front and rear main oils seals
oil pan gasket
going to clean harness to pcm with cleaner and new grease tomorrow and test pressure at fuel rail next time it acts up

Here is what i am considering:
cps-(except it never completely dies)
tps
connection to pcm or pcm itself
o2 sensor but experience either they work or they dont no really in between
coil
If you have any input or see something i missed any information would greatly appreciated

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Unread 03-24-2011, 11:13 PM   #2
sirwilliam706
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1995 ZJ 
 
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Location: Martinez, Ga
Posts: 21
oh and only getting error 12 which is nothing other than that no error codes
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Unread 03-24-2011, 11:17 PM   #3
rooster51
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1997 ZJ 
 
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Posts: 1,634
With no codes, I'd guess PCM. But I'm just guessing.
Brace yourself.
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Unread 03-25-2011, 07:09 AM   #4
sirwilliam706
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1995 ZJ 
 
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yeah thats what im thinking too not hard to change just a little pricey
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Unread 03-25-2011, 07:21 AM   #5
mrduke
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1996 ZJ 
 
Join Date: Dec 2010
Location: , Kentucky
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I went through all that also. Got a new PCM for 96 ZJ on Ebay for 185.00. Been 6 weeks now and no problems.
http://cgi.ebay.com/ebaymotors/JEEP-...item56416ff79d
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Unread 03-25-2011, 07:38 AM   #6
Foundrydude
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1995 ZJ 
 
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Location: Flatsville, IA
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Heat can do weird things to failing coils.

96 is obd II and much more complicated than 95 obd I. Not all problems/solutions are the same.

Next time it's running funny unplug the tps and see what happens.

good luck
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Unread 03-25-2011, 01:08 PM   #7
sirwilliam706
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ill try some other things before replacing pcm got some more testing to do i will do a running update
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Unread 03-25-2011, 02:30 PM   #8
klockdoc
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Quote:
Originally Posted by sirwilliam706 View Post
ill try some other things before replacing pcm got some more testing to do i will do a running update
Check the plugs to the PCM. With the motor running, wiggle the plugs around and see if it affects the engines running.

I had this problem just recently and used the hose clamp method to correct.

You can check the TPS by using a volt meter and disconnecting the plug. With the key on, back probe the center wire (I used a needle) attach the + wire for the meter, attach the - to a good ground. The meter should read, .02 volts - .09 volts when closed, should go to 4.5 - 5.0 volts when open. If it passes this test, then the PS is good.
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Unread 03-26-2011, 07:58 PM   #9
kappa080
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1995 ZJ 
 
Join Date: Mar 2009
Location: Reno,nv
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My Zj was doing the same thing. Replaced the fuel pump works fine now. I would check but taking it out on a longer drive put some new fuel in see if it works. I know weird but i thought my pcm or my tranny was going out when it was doing this. turned out to be something minor.
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Unread 03-26-2011, 11:16 PM   #10
classicmetalman
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Quote:
Originally Posted by kappa080 View Post
My Zj was doing the same thing. Replaced the fuel pump works fine now. I would check but taking it out on a longer drive put some new fuel in see if it works. I know weird but i thought my pcm or my tranny was going out when it was doing this. turned out to be something minor.
Fuel pump-minor? Props dude! Not difficult, but man a PITA! Guess that's my bad for having 1/4 of fuel in the tank. LOL
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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 03-27-2011, 07:55 AM   #11
ZeeJay1997
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Just to clarify, the 93-95 does not have a history of connector problems at the PCM. The PCM is these models have caps that dry out in the PCM and can be easily repaired if you have basic soldering skills.
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Unread 03-27-2011, 10:14 AM   #12
classicmetalman
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Quote:
Originally Posted by ZeeJay1997 View Post
Just to clarify, the 93-95 does not have a history of connector problems at the PCM. The PCM is these models have caps that dry out in the PCM and can be easily repaired if you have basic soldering skills.
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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 03-27-2011, 10:25 AM   #13
JS97ZJ
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1997 ZJ 
 
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It sound as though that when the PCM goes into closed loop, the fuel trims are not getting a good signal from one of the sensors. I would check all the related sensors (intake temp, map, O2). I'm not all that familiar with the 95 PCM but I've read enough about it to say it is a fairly dependable unit outside of the caps going bad. The caps on that PCM control the ASD relay and that's not what seems to be your problem.
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Unread 03-27-2011, 10:35 AM   #14
kachink
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1998 ZJ 
 
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Quote:
Originally Posted by Foundrydude View Post
Heat can do weird things to failing coils
x2

or, my first thought when you said rough running and low power was a clogged cat.
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Unread 03-27-2011, 11:24 AM   #15
sirwilliam706
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Location: Martinez, Ga
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thanks for all the input still getting the problems im just not understanding why i am not getting any trouble codes
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