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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > My Jeep is a hole in my pocket. Please help!

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Unread 01-03-2014, 06:36 AM   #16
Spify
Registered User
1996 ZJ 
 
Join Date: Sep 2013
Location: Whiteman Airforce Base, Missouri
Posts: 17
Quote:
Originally Posted by JS97ZJ View Post
Follow the steps in ZeeJay's write up in his sig.
If tapping or moving the plugs on the PCM cause it to stall your probably looking at a PCM.
If you can solder or know someone that can solder try this procedure


http://www.jeepforum.com/forum/f13/9...tures-1303589/


I've soldered up 4 PCMs to fix this stalling problem. Each was a success except for ZeeJay's.

Yesterday I ran the engine and tapped everywhere possible on the PCM as well as the PDC and the engine did not stall, I then pulled all plugs and used electronic cleaner on the 3 connectors into the PCM and cleaned the PDC out as well. My jeep still stalled about 10 minutes after driving down the road.

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Unread 01-03-2014, 10:03 AM   #17
JS97ZJ
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1997 ZJ 
 
Join Date: Dec 2009
Location: Dingmans Ferry, PA
Posts: 2,035
If it is the PCM (solder joints) it could very well only act up while driving. Small vibrations can trigger it while rough handling does nothing. It's the nature of the beast.
Make sure you go though Z's list and pay attention to the connections and grounds.
Try wrapping the PCM with ty's like in Z's picture. If it makes any kind of difference it will be the PCM.
zeejays-pcm.jpg  
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Unread 01-03-2014, 11:56 PM   #18
mig1289
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1998 ZJ 
 
Join Date: May 2008
Location: philadelphia, pa
Posts: 419
Have you replaced the cps or iac sensors?
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Unread 01-04-2014, 08:12 AM   #19
johnniebravo
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2008 WK 
 
Join Date: Sep 2002
Location: Bristow, VA
Posts: 843
I experienced a similar problem years ago, my issue ended up being a wiring short.

Get a factory build sheet and figure out what options were on the build sheet and compare that to what is installed on the Jeep. If an option is not listed, a dealer or owner added it. Dealers don't always add options properly, which can end up being problem areas. Follow the wires for not listed options and see where they tie into the harness for power.

In my personal case, I had cruise control and it wasn't on my build sheet. The power pulled from wires that ultimately fed the crank sensor. Every time the short happened on cruise control wiring, engine lost timing and stalled. Happened a lot and nothing fixed it other than finding the short.

Hope this helps.
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Unread 01-04-2014, 09:23 PM   #20
Spify
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1996 ZJ 
 
Join Date: Sep 2013
Location: Whiteman Airforce Base, Missouri
Posts: 17
Thanks for the info and tips, Guys I have this hunch it is the fuel pump; call me crazy but I think that is the problem. I will try the zip tie PCM method soon and see what happens there. My fuel pump causes a loud buzzing sound that can be heard from under the tank very well, when the engine stalls you can hear the sound and when the engine dies the buzzing of the fuel pump does not stop. I have noticed the Jeep struggles harder on cold days, This alone made me think it could of been a fuel issue but I wasn't sure.

I know that cold weather calls for a richer fuel mixture which made me believe that maybe the pump wasn't pushing out an optimal quantity of fuel to the engine. I know that evidence of a bad fuel pump could point to bucking and rough stalling. However I feel as if the Jeep kind of hiccups at Idle but when accelerating it would just cut off as if the ignition switch was switched to the off position, no electricity in the vehicle ceases even the heater continues operating which normally requires the engine to be running.

I have also noticed that the problem seems to be intensifying as time passes, Tonight the engine would stall at idle, it did this for about 15-20 minutes straight. I managed to Drive the thing to the gas station by gassing it, popping it in neutral coasting and when the engine dies crank it back up while in neutral and shift her back into drive. (she's an automatic, probably not the best idea but I've got this down to a science). Once I arrived at the Fuel station I put in about 6 gallons of low quality gas (probably should have put in super-unleaded now that I think about it) Put some fuel system cleaner in there and she made it the rest of the way home without a single stall *the strange thing is that, it has worked in the past without adding fuel or system cleaner) Any opinions?

By the way saw this on Ebay: http://www.ebay.com/itm/New-Electric...e68e1e&vxp=mtr It's cheap so if my fuel pump wasn't the verdict this wouldn't be a pocket burner.

So what is a good way to see if it is the fuel pump or not? thanks guys.
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Unread 01-04-2014, 09:46 PM   #21
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
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check the fuel pressure at the test port on the rail. you can use the tool loan at Advance Auto or if you're on Whiteman, do they have an auto hobby shop?
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Unread 01-04-2014, 09:58 PM   #22
thexbeast12
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1998 ZJ 
 
Join Date: Mar 2013
Location: charleston, sc
Posts: 29
Any luck on your CV? If not I can tell you it's an easy fix. I'm still working on my jeep and I did 2 of mine this past summer( 1 was going bad figures I'd redo both). If a girl can do it so can you. Lol.
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Unread 01-04-2014, 10:11 PM   #23
xrunndonex
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Location: coffeyville, Kansas
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Quote:
Originally Posted by Gearhead31 View Post

THIS!!

Rust will easily turn a 5 minute job into a 5 hour job
Torch
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Unread 01-05-2014, 08:08 AM   #24
JS97ZJ
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1997 ZJ 
 
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Location: Dingmans Ferry, PA
Posts: 2,035
A buzzing pump is not a good sign. I'd get that pressure tested before any thing else.
If it turns out that the pump is shot, go with a Bosch fuel pump. They are the original brand to Jeep. The cheaper brands too often fail within 1 year.
You can replace just the pump but you also need to get the 2 internal filters that don't come with the pump. Most guys here go with buying the whole module but that cost $.
The filter that comes with it is not the correct one for the Jeep.
.1.png

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Unread 01-05-2014, 08:46 AM   #25
motordoctor
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1998 ZJ 
 
Join Date: Dec 2009
Location: NYC
Posts: 104
I don't know if this has been mentioned but you might have water in your fuel system. The pump picks up from the bottom of the tank where the water would sit. When it's cold out (has to be freezing where you are) the water will freeze and no more fuel pressure. The fuel system cleaner probably has alcohol in it and helps with fuel line freezing. I had that problem once with a motorcycle. I was riding it and the water in the bottom of the tank froze which stopped the fuel flow, even though the tank was full. Got some fuel line additive (basically methanol), thawed the tank out and away I went
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Unread 01-05-2014, 09:36 AM   #26
ZeeJay1997
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the water / ice idea is a good one. if Heet doesnt help, you still need to check pressure.

take a look here.
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Unread 01-05-2014, 06:37 PM   #27
papitt
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1995 ZJ 
 
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Location: Stephenville Texas 76401, Texas
Posts: 709
What are you thoughts on that KESHEN pump .. I've not heard of it before but every pump I tried has been junk.
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Unread 01-18-2014, 03:16 PM   #28
Spify
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1996 ZJ 
 
Join Date: Sep 2013
Location: Whiteman Airforce Base, Missouri
Posts: 17
Hey, i gave in took it to a mechanic, he looked at it he suspects possibly faulty fuel pump or maybe a bad catalytic converter? any thoughts?
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Unread 01-18-2014, 03:52 PM   #29
scope513
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1997 ZJ 
 
Join Date: Jan 2014
Location: Cleves, Ohio
Posts: 33
I have/haf the stallung problems also...Its your pcm...what year is your zj? Also if it is a 97 like mine all you have to do is take out your coolant resivor and the pcm is the box mounted to the fire wall. Use zip ties but not the thick ones use the skinny ones. I connected three together so it fully wraps arond it. Do each plug. Before you do the plugs put some dielectric grease on them. Tighten as tight as possible with out snapping them. Install your resivor. Make sure you take off the negative battery cable first. During the time itll give the pcm a chance to restart. This should eliminate or make it not stall ad much.
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Unread 01-18-2014, 04:59 PM   #30
Spify
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1996 ZJ 
 
Join Date: Sep 2013
Location: Whiteman Airforce Base, Missouri
Posts: 17
Quote:
Originally Posted by scope513 View Post
I have/haf the stallung problems also...Its your pcm...what year is your zj? Also if it is a 97 like mine all you have to do is take out your coolant resivor and the pcm is the box mounted to the fire wall. Use zip ties but not the thick ones use the skinny ones. I connected three together so it fully wraps arond it. Do each plug. Before you do the plugs put some dielectric grease on them. Tighten as tight as possible with out snapping them. Install your resivor. Make sure you take off the negative battery cable first. During the time itll give the pcm a chance to restart. This should eliminate or make it not stall ad much.
I will give this a shot, i want the problem to be gone already i cant stand being broke because of buying parts all the time
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help needed , jeep grand cherokee , stalling

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