Jeep Cherokee Forum

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech
Register Forgot Password?
Register Photos FAQ Members List Social Groups Search Today's Posts Mark Forums Read GarageVendor DirectoryvBLive TSB & Recalls
Search

Welcome to Cherokee Forum!
Welcome to Cherokee Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread Display Modes
Old 07-01-2011, 02:10 PM   #1
Seasoned Member
 
rompnXJ's Avatar
 
Join Date: May 2011
Posts: 345

View rompnXJ's Photo Album My Photos
Cherokee
Default random stalling.. another CPS?

1994 4.0L 4WD -

here's whats goin on with it.
it keeps randomly shutting off, and when it does you have to turn the key off and let it sit for a minute or two, then it fires back up and will usually go for a few minutes before stalling out and i have to let it sit again.

so last night i replaced the crank sensor with a new one (aftermarket), it drove fine for about a mile and then started misfiring real bad and stalled out. would start back up but still misfire. i found that if i disconnected the battery each time it stalled, it would run for about a mile at a time before it would start to misfire and stall out.
i put my old crank sensor back in, no more misfiring but of course it still stalls out randomly. i've also noticed the speedometer drops to zero when it stalls.

should i try another crank sensor? what else can i be checking? what are some other likely causes?

i've also swapped the ASD (autoshutdown) relay, no luck.
fuel pressure at idle with vacuum line connected/disconnected is within spec, as is the fuel pressure bleed-down, according to specs from alldata.

Last edited by rompnXJ; 07-01-2011 at 02:31 PM.
rompnXJ is offline   Reply With Quote
Old 07-01-2011, 02:55 PM   #2
Senior Member
 
94JeepCherokeeMan's Avatar
 
Join Date: Jun 2011
Location: Southern Idaho
Posts: 972

View 94JeepCherokeeMan's Photo Album My Photos
1994 Cherokee
Default

Sounds to me like an alternator problem

Rob
__________________
(Cute German friend): *Flips down passenger-side visor*
"What the heck, there's no mirror!"

(Me): *Incredulous look on face*
"It's a Jeep, why the hell does it need one?"
94JeepCherokeeMan is offline   Reply With Quote
Old 07-01-2011, 05:50 PM   #3
Seasoned Member
 
rompnXJ's Avatar
 
Join Date: May 2011
Posts: 345

View rompnXJ's Photo Album My Photos
Cherokee
Default

battery voltage is 13.9 at idle, battery always stays charged and it cranks fine.

also, i replaced the crank sensor again today with a new one from autozone. no more misfiring, but the random stalling is still there. except this time, instead of random stalling, it stalls randomly only when i try to give it gas.

the pcv/crankcase breather-to-airbox hose has been disconnected for a few weeks, today i put a new hose on it and it seems to somehow be running fine now. i have no idea how that could have anything to do with it. i need to test drive it some more to confirm its fixed, but in case its not... what else can i check?

Last edited by rompnXJ; 07-01-2011 at 05:55 PM.
rompnXJ is offline   Reply With Quote
Old 07-01-2011, 06:44 PM   #4
Senior Member
 
94JeepCherokeeMan's Avatar
 
Join Date: Jun 2011
Location: Southern Idaho
Posts: 972

View 94JeepCherokeeMan's Photo Album My Photos
1994 Cherokee
Default

Fuel pump, distributor... I don't know for sure, I'mjust giving you suggestions...
__________________
(Cute German friend): *Flips down passenger-side visor*
"What the heck, there's no mirror!"

(Me): *Incredulous look on face*
"It's a Jeep, why the hell does it need one?"
94JeepCherokeeMan is offline   Reply With Quote
Old 07-01-2011, 07:03 PM   #5
Member
 
AutobotXJ's Avatar
 
Join Date: Jan 2011
Location: Volcano, HI
Posts: 182

View AutobotXJ's Photo Album My Photos
1992 Cherokee
Default

Did it suddenly start doing this or did it work itself into something this bad? Try checking your tps, idle sensor, map, and even your o2 sensor. It could even be a computer problem....
AutobotXJ is offline   Reply With Quote
Old 07-01-2011, 07:15 PM   #6
Seasoned Member
 
lurk520's Avatar
 
Join Date: Apr 2010
Location: Tucson, AZ
Posts: 453

View lurk520's Photo Album My Photos
2002 Grand Cherokee
Default

Get a multi-meter and some kind of repair manual and check all your sensors.
__________________
93 XJ Sold! Darn!
lurk520 is offline   Reply With Quote
Old 07-01-2011, 08:02 PM   #7
Member
 
SNIDELYWHIPLASH's Avatar
 
Join Date: Dec 2009
Location: South Jersey
Posts: 207

View SNIDELYWHIPLASH's Photo Album My Photos
1992 Cherokee
Default

Quote:
Originally Posted by rompnXJ View Post
... what else can i check?
Check for fault codes:
http://jeep-xj.info/HowtoECUcodes.htm
SNIDELYWHIPLASH is offline   Reply With Quote
Old 07-01-2011, 08:57 PM   #8
Seasoned Member
 
rompnXJ's Avatar
 
Join Date: May 2011
Posts: 345

View rompnXJ's Photo Album My Photos
Cherokee
Default

TPS is a couple weeks old, there are no codes in it, and it always has good fuel pressure even when it wont start back up.

tonight i went wheeling with it for a good couple hours thru some mud, deep water, hills, stuff like that; it never even hinted at stalling. im gonna keep my fingers crossed that it stays this way.

but a failing distibutor could cause random stalling, even without it ever misfiring? also, is the cam sensor built into the distributor or does it not have one?
the only time the jeep has ever misfired was when i replaced the crank sensor with a junk aftermarket sensor. also, ive never seen an o2 sensor cause a car to stall, u can drive without it all day long; and if it was bad it would run like sh**.

whatever yall think the most likely culprits are (besides fuel pump, ckp, tps), will go on my to-do list.
thanks for the help.

Last edited by rompnXJ; 07-01-2011 at 09:02 PM.
rompnXJ is offline   Reply With Quote
Old 07-01-2011, 09:11 PM   #9
Member
 
AutobotXJ's Avatar
 
Join Date: Jan 2011
Location: Volcano, HI
Posts: 182

View AutobotXJ's Photo Album My Photos
1992 Cherokee
Default

I've actually had mine continuously stall on the highway for a week before i found that my o2 sensor was faulty. I think my seafoam ruined my o2 sensor.
AutobotXJ is offline   Reply With Quote
Old 07-01-2011, 09:28 PM   #10
Seasoned Member
 
rompnXJ's Avatar
 
Join Date: May 2011
Posts: 345

View rompnXJ's Photo Album My Photos
Cherokee
Default

Quote:
Originally Posted by AutobotXJ View Post
I've actually had mine continuously stall on the highway for a week before i found that my o2 sensor was faulty. I think my seafoam ruined my o2 sensor.
your kidding??
except for the stalling, did it run good with the bad o2 ?

and btw, yes this problem came on all of a sudden about 3 weeks ago, it seems to only act up on the weekends lol.. but this last week its been doing it every day.
rompnXJ is offline   Reply With Quote
Old 07-02-2011, 12:35 AM   #11
Member
 
AutobotXJ's Avatar
 
Join Date: Jan 2011
Location: Volcano, HI
Posts: 182

View AutobotXJ's Photo Album My Photos
1992 Cherokee
Default

It would drive fine then lose power even on even road. Finally my friend told me to check the o2 sensor and i was sceptical but he was right.
AutobotXJ is offline   Reply With Quote
Old 07-02-2011, 12:36 AM   #12
Member
 
AutobotXJ's Avatar
 
Join Date: Jan 2011
Location: Volcano, HI
Posts: 182

View AutobotXJ's Photo Album My Photos
1992 Cherokee
Default

I think it would get worse the hotter it got...
AutobotXJ is offline   Reply With Quote
Old 07-02-2011, 04:17 PM   #13
Seasoned Member
 
rompnXJ's Avatar
 
Join Date: May 2011
Posts: 345

View rompnXJ's Photo Album My Photos
Cherokee
Default

Quote:
Originally Posted by AutobotXJ View Post
It would drive fine then lose power even on even road. Finally my friend told me to check the o2 sensor and i was sceptical but he was right.
lose all power and stall out right away, or just kinda gradually get sluggish, then die out eventually?
rompnXJ is offline   Reply With Quote
Old 07-02-2011, 07:16 PM   #14
Member
 
AutobotXJ's Avatar
 
Join Date: Jan 2011
Location: Volcano, HI
Posts: 182

View AutobotXJ's Photo Album My Photos
1992 Cherokee
Default

More like the first- it would lose power fairly quickly, putter out and die but didn't always die).
AutobotXJ is offline   Reply With Quote
Old 07-02-2011, 08:36 PM   #15
Seasoned Member
 
rompnXJ's Avatar
 
Join Date: May 2011
Posts: 345

View rompnXJ's Photo Album My Photos
Cherokee
Default

wow, ok thanks!
i will throw a new o2 sensor in it to be on the safe side.
rompnXJ is offline   Reply With Quote
Old 07-02-2011, 08:36 PM
 
 
 
submit to reddit
Reply
Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Random Stalling Problem kissthis66 OEM Cherokee Tech 0 04-15-2011 11:53 AM
99 cherokee 4.0 random stalling 99jeepc4door OEM Cherokee Tech 12 03-21-2011 05:22 PM
Random stalling......need help cumo000 OEM Cherokee Tech 46 11-12-2010 06:04 AM
2000 jgc random stalling SALEXANDER72 OEM Cherokee Tech 0 10-25-2010 09:08 AM
random stalling???? utfan OEM Cherokee Tech 3 12-16-2009 08:30 PM


All times are GMT -5. The time now is 06:46 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.5.2
This site is in no way affiliated with Jeep or Chrysler.

Emails Backup