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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Common ZJ Problems / Tutorial On How To Fix Them

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Unread 12-05-2012, 04:34 PM   #61
jeepgirl1321
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1997 ZJ 
 
Join Date: Dec 2011
Location: , new Hampshire
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Quote:
Originally Posted by JasonStebbins View Post
Could be a number of things. What does it do when it dies?

Fuel pump/CPS/Alternator/Battery/TPS/Upstream oxygen sensor/ECM

Post some symptoms of what happens before/when it dies.
right before it dies, the rpm completely die. and i loose power steering. Its like the engine just dies. New alternator battery and fuel pump.. and sometimes it doesn't completely turn off, the rpm's will die down then come back.

any ideas? cause I'm lost.

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Unread 12-05-2012, 04:42 PM   #62
nwzj_jeeper
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Did you reset the PCM?
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Unread 12-05-2012, 05:43 PM   #63
jeepgirl1321
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1997 ZJ 
 
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Location: , new Hampshire
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Quote:
Originally Posted by nwzj_jeeper View Post
did you reset the pcm?
pcm?
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Unread 12-05-2012, 05:50 PM   #64
cgcarpenter
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1997 ZJ 
 
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The thing in front of your coolant reservoir tank... It has three connectors on it.
When the jeep is running wiggle each connection one by one as see if the symptoms show...

I had the exact same problem on my 4.0 and I needed a new pcm
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Unread 12-05-2012, 05:57 PM   #65
nwzj_jeeper
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Look it up you disconnect the positive battery turn te key 3 times off on off on off on and reconnect and it resets it. It clears the codes and re teaches the care to idle
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Unread 12-05-2012, 06:15 PM   #66
JasonStebbins
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Quote:
Originally Posted by jeepgirl1321 View Post
right before it dies, the rpm completely die. and i loose power steering. Its like the engine just dies. New alternator battery and fuel pump.. and sometimes it doesn't completely turn off, the rpm's will die down then come back.

any ideas? cause I'm lost.
Sounds like the CPS (very common) or the ECM. As suggested, wiggle the three connectors while running. Any change in idle is bad.

Any starting problems after it dies?

Fuel filter in good shape?

Are your battery clamps/terminals/grounds clean and tight? Even if they are shiny, remove everything and thoroughly clean them. Check the wiring on the positive and negative a couple inches back. Look for frayed/burnt wires.
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Unread 12-05-2012, 09:52 PM   #67
phitmein
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" If you own a ZJ, you know all too well about oil leaks. The three notorious leaks are caused by bad valve cover gaskets, the oil filter adapter and the rear main seal."

You might want to add the oil pressure sending unit to that list.

It can make oil pour out the motor.

Phit

Edit: Great job on the write up Jason.
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Unread 12-05-2012, 10:49 PM   #68
nwzj_jeeper
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Quote:
Originally Posted by phitmein
" If you own a ZJ, you know all too well about oil leaks. The three notorious leaks are caused by bad valve cover gaskets, the oil filter adapter and the rear main seal."

You might want to add the oil pressure sending unit to that list.

It can make oil pour out the motor.

Phit

Edit: Great job on the write up Jason.
That's what happen to me the pressure unit was spraying oil everywhere.
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Unread 12-06-2012, 05:33 AM   #69
LeeZJ
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1996 ZJ 
 
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On the headlights flickering issue.

When I change my lights to full beam and off again I lose all light from my headlights for a couple seconds each time. It scares me everytime but when your standard headlights aren't great I have to stick full beam on where possible.

Would this fix solve that issue or something else entirely?

Great post. Thanks Lee
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Unread 12-06-2012, 08:56 AM   #70
razortec_hunter
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Anyone have a write up on replacing heater core??
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Unread 12-06-2012, 03:26 PM   #71
oldmancrash
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Unread 12-06-2012, 04:08 PM   #72
nwzj_jeeper
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Quote:
Originally Posted by razortec_hunter
Anyone have a write up on replacing heater core??
There are a few in the other threads. Just hot to demos the while dash and ect . I need to replace mine it get annoying all the foggy/steam that comes out if vents.
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Unread 12-15-2012, 10:47 PM   #73
nakedfrog
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1995 ZJ 
 
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With regard to:
Quote:
8. No Intermittent Wipers/Won't Go Back "Home"

This is a very annoying problem. Start by checking fuses in the kick panel and under the hood.

Second, replace the intermittent wiper control module velcroed under the driver side dash or under the removable grille under the windshield. It is a little black box and the wires run to the steering wheel or wiper motor. Also test and replace the intermittent wiper relay in PDC (Power Distribution Center).
It seems worthwhile to mention this thread, it really is a simple fix versus getting a replacement wiper module, for folks who aren't afraid to do a little soldering. I just did it tonight, and it was pretty simple.
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Unread 12-16-2012, 09:08 AM   #74
ZeeJay1997
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Quote:
Originally Posted by JasonStebbins View Post
replace the intermittent wiper control module velcroed under the driver side dash or under the removable grille under the windshield.
It's also worth mentioning that the >96 models do not have this module. It's right in there with the blinker fluid.
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Unread 12-16-2012, 10:39 AM   #75
NJ2MDJim
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Seriously nice write-up. Thanks!
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