4.0 problems, BAH! - Page 2 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > 4.0 problems, BAH!

Stainless Steel Door Hinge PinsPoly Door Hinge BushingsSteinjager TJ tube doors

Reply
Unread 08-21-2013, 02:45 PM   #16
Martin600
Registered User
1997 ZJ 
 
Join Date: Jun 2013
Location: Perth, Tayside
Posts: 75
Okay, I got codes

12
25
22
27
51
55

Is there a thread which lists these codes?

I know one of them is IAC, because my dad unplugged it with the engine running. (and god knows what else, I wasn't there)

Are they stored in the order in which they were triggered?

Martin600 is offline   Reply With Quote
Unread 08-21-2013, 02:54 PM   #17
JeepNicholson
Registered User
1996 ZJ 
 
Join Date: Apr 2013
Location: Burbank, OH
Posts: 755
Quote:
Originally Posted by Martin600 View Post
Okay, I got codes

12
25
22
27
51
55

Is there a thread which lists these codes?

I know one of them is IAC, because my dad unplugged it with the engine running. (and god knows what else, I wasn't there)

Are they stored in the order in which they were triggered?
http://www.allpar.com/fix/80s-codes.html

If you've got a smart phone, there are also a few free apps that, well, decode the codes. I use one called OBD Error Codes that decodes both old style and obdii codes, and it's handy to have with you all the time.
JeepNicholson is offline   Reply With Quote
Unread 08-21-2013, 03:28 PM   #18
Martin600
Registered User
1997 ZJ 
 
Join Date: Jun 2013
Location: Perth, Tayside
Posts: 75
Ahh good thinking! Pity, I've got the Torque app and it doesn't have the old codes

Okay, ignoring 12, 25, 27 (some of the injectors were unplugged) and 55.

Leaves me with code 22 and 51.

22. Coolant sensor signal out of range? Where is the coolant sensor? I find a sensor on the engine but appears to be just for the temp gage in the car?

It can't be the coolant level sensor in the reservoir, I've tested that already. it was 3.2kohm at "full" and 0 at empty.

51, O2 sensor stuck in lean position. Possible bad map sensor (that would explain the black smoke, rough idling and rich smelling exhaust fumes at hot idle?)

Is there any way I can test the map sensor, resistances etc?

Thanks for all the help so far
Martin600 is offline   Reply With Quote
Unread 08-21-2013, 03:49 PM   #19
JeepNicholson
Registered User
1996 ZJ 
 
Join Date: Apr 2013
Location: Burbank, OH
Posts: 755
The engine temp gauge on your dash gets its info from the coolant temp sensor, because if your coolant is too hot, your engine is too hot. Though not to be confused with the ambient air temp which is just a bonus weather thing and has nothing to do with your engine, of course.
It's on the driver's side of your engine toward the back, next to your valve cover and sorta under the MAP-

http://www.olypen.com/craigh/images/tempsensor.jpg

Not sure about the map sensor though as I've never had any issues with mine, though I might remember reading that the map sensor code could have something to do with a bad or dirty IAC and possibly not the actual map, but don't quote me on that, because I could be completely wrong, lol. Just something to consider.
Anyway, it certainly won't hurt anything to clean your IAC anyway, and it's quick cheap and easy. Clean the hole it comes out of, too.


ZJ FSM
https://drive.google.com/folderview?...Fk&usp=sharing
JeepNicholson is offline   Reply With Quote
Unread 08-21-2013, 05:52 PM   #20
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,383
I would suspect that dad unplugged the coolant sensor too since it lives near the injectors.

The lean o2 sensor would cause your symptoms. Unplug the front sensor and see how it runs. the connector is under the manifold.
ZeeJay1997 is offline   Reply With Quote
Unread 08-22-2013, 04:05 PM   #21
Martin600
Registered User
1997 ZJ 
 
Join Date: Jun 2013
Location: Perth, Tayside
Posts: 75
Doing a 200 mile round trip tomorrow, unplugged the front lambda sensor, will let you know how it gets on

Will upload pics of my engine bay shortly, so you can see what I'm dealing with. The description and pictures shown to me do not match what I have.

That's 100% alternator in the way of No.1 spark plug and there's no air compressor
Martin600 is offline   Reply With Quote
Unread 08-22-2013, 04:07 PM   #22
Martin600
Registered User
1997 ZJ 
 
Join Date: Jun 2013
Location: Perth, Tayside
Posts: 75








The image at the top shows the sensor which controls the signal to the temp gage in the car.
Martin600 is offline   Reply With Quote
Unread 08-22-2013, 04:31 PM   #23
JeepNicholson
Registered User
1996 ZJ 
 
Join Date: Apr 2013
Location: Burbank, OH
Posts: 755
Quote:
Originally Posted by Martin600 View Post
That's 100% alternator in the way of No.1 spark plug and there's no air compressor
You don't, and never had AC?
JeepNicholson is offline   Reply With Quote
Unread 08-22-2013, 04:55 PM   #24
Martin600
Registered User
1997 ZJ 
 
Join Date: Jun 2013
Location: Perth, Tayside
Posts: 75
Quote:
Originally Posted by JeepNicholson View Post
You don't, and never had AC?
Aircon? yeah it has that, and it's all there and it works

I thought you meant it had an air pump like for emissions and stuff.
Martin600 is offline   Reply With Quote
Unread 08-22-2013, 04:59 PM   #25
JeepNicholson
Registered User
1996 ZJ 
 
Join Date: Apr 2013
Location: Burbank, OH
Posts: 755
Quote:
Originally Posted by Martin600 View Post

Aircon? yeah it has that, and it's all there and it works

I thought you meant it had an air pump like for emissions and stuff.
Lol I was just wondering, cause on the 4.0 the compressor for your AC normally sits above your alternator right next to that first plug. From the pics though, I see that isn't the case. Where IS your a c compressor?

But no, not a regular air compressor lol

That would be useful though, my buddy has one on his Ram 2500 Cummins, he can hook his air tools right up to his truck, and the tank sits underneath the frame. Pretty sweet.

ZJ FSM
https://drive.google.com/folderview?...Fk&usp=sharing
JeepNicholson is offline   Reply With Quote
Unread 08-22-2013, 06:01 PM   #26
ZeeJay1997
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,383
This like Where's Waldo. lol

it appears the compressor is mounted under the alternator base on the cooloant lines.

little peice of advice that may solve your problem.
get some new plug wires and route your coil wire so it does not cross the plug wires. it looks like #2 show some signs of arcing. open the hood at night and rev it up and check for blue lights.

the throttle body needs some serious cleaning.

the stud for the hot wire on the alternator looks like it's rusty

the #1 injector connector looks like it's growing something. all of the connectors need to be cleaned.

change out the idler pully or it will eat your belt

look inside the PDC for other wild life.

sorry if i sound critical, i inspect things for a living and trying to help
ZeeJay1997 is offline   Reply With Quote
Unread 08-23-2013, 01:23 AM   #27
Oldfrog
Web Wheeler
1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 3,804
Wow, I've never seen a 4.0 with the alternator on top of the A/C compressor. Is that a mod some one did, or did some ZJ's come like that?

The brake master cylinder is on the passenger side ? swapped with the coolant bottle? This is a 97 model? Not a USA model, I am assuming.
__________________
Cajun Recipes and Fishing tips

Words of wisdom, Posted by Zeejay:
"..it's not air, it is the opposite of air... suckage so to speak."

Stalling? Work through Zeejay's list
Oldfrog is offline   Reply With Quote
Unread 08-23-2013, 05:14 AM   #28
89arkansasxj
Registered User
1995 ZJ 
 
Join Date: May 2008
Location: england arkansas
Posts: 52
This is an RHD rig and it's in the UK I'm betting.
89arkansasxj is offline   Reply With Quote
Unread 08-23-2013, 10:53 AM   #29
Martin600
Registered User
1997 ZJ 
 
Join Date: Jun 2013
Location: Perth, Tayside
Posts: 75
Quote:
Originally Posted by ZeeJay1997 View Post
This like Where's Waldo. lol

it appears the compressor is mounted under the alternator base on the cooloant lines.

little peice of advice that may solve your problem.
get some new plug wires and route your coil wire so it does not cross the plug wires. it looks like #2 show some signs of arcing. open the hood at night and rev it up and check for blue lights.

the throttle body needs some serious cleaning.

the stud for the hot wire on the alternator looks like it's rusty

the #1 injector connector looks like it's growing something. all of the connectors need to be cleaned.

change out the idler pully or it will eat your belt

look inside the PDC for other wild life.

sorry if i sound critical, i inspect things for a living and trying to help
I'd rather someone just got to the point, I've been on many other forums and people seem so unsure when they reply or give generic googled advice.

I'll get right onto those things, I did suspect arcing.

Quote:
Originally Posted by Oldfrog View Post
Wow, I've never seen a 4.0 with the alternator on top of the A/C compressor. Is that a mod some one did, or did some ZJ's come like that?

The brake master cylinder is on the passenger side ? swapped with the coolant bottle? This is a 97 model? Not a USA model, I am assuming.
Uhh, brake MC is on your passenger side, yes. Not a USA model.

Quote:
Originally Posted by 89arkansasxj View Post
This is an RHD rig and it's in the UK I'm betting.
You bet right, it's a 1997 ZG

UK RHD, also I think it's the ZG down under as well.


In the UK, we also have a 2.5 TD option as well - which is great for towing and having fun in the hills, as long as you watch the water temp because the gaskets are famous for failing - it was designed as a boat engine after all.
Martin600 is offline   Reply With Quote
Unread 08-26-2013, 02:53 PM   #30
Martin600
Registered User
1997 ZJ 
 
Join Date: Jun 2013
Location: Perth, Tayside
Posts: 75
Okay! results!

Unplugged the first lambda sensor, been driving it about (over 300 miles) and not even a single splutter out of it. it's "fixed".

So, I've got a dead lambda sensor? OR a worn MAP sensor? what's most likely?
Martin600 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.