Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here XJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.

Need help with CPS

Thread Tools
 
Search this Thread
 
Old Dec 28, 2011 | 10:51 PM
  #16  
DFlintstone's Avatar
CF Veteran
 
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Default

Your going to need more help than I can give you. Yea, on a Renix <90, that's one hallmark of a bad CPS, cutting out. If you have good spark and fuel maybe it's flooded. Smell gas? Plugs wet? If the MAP sensor there up on the firewall isn't getting good vacuum it would dump fuel...maybe flood it.
Reply
Old Dec 28, 2011 | 10:53 PM
  #17  
lynskynbnd's Avatar
Senior Member
 
Joined: May 2011
Posts: 734
Likes: 0
Default

CPS=Camshaft Position Sensor.
CKP=Crankshaft Position Sensor.

Both easy to replace.
Reply
Old Dec 28, 2011 | 11:00 PM
  #18  
douglasstorm's Avatar
Thread Starter
Newbie
 
Joined: Dec 2011
Posts: 14
Likes: 0
From: Gilbert, AZ
Year: 1993
Model: Cherokee
Engine: 4.0L
Default

LYNSKY...both have been replaced.

DF...when I pulled the spark plug out to check the spark....it smelled like gas. I did put a new o2 sensor in afew weeks ago.
Reply
Old Dec 28, 2011 | 11:42 PM
  #19  
DFlintstone's Avatar
CF Veteran
 
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Default

"or vent solenoid circuits open or shorted" Have you by chance been topping it off when you fill the tank?

I was going to see if you can feel vacuum at the MAP, but if its not running....That little tube out of the rubber plug on the throttle body, back to the map, breaks and splits allot. If there is a leak the MAP will run it rich. You might check that any day.

Was there any black smoke?
Reply
Old Dec 28, 2011 | 11:47 PM
  #20  
douglasstorm's Avatar
Thread Starter
Newbie
 
Joined: Dec 2011
Posts: 14
Likes: 0
From: Gilbert, AZ
Year: 1993
Model: Cherokee
Engine: 4.0L
Default

Originally Posted by DFlintstone
"or vent solenoid circuits open or shorted" Have you by chance been topping it off when you fill the tank?

I was going to see if you can feel vacuum at the MAP, but if its not running....That little tube out of the rubber plug on the throttle body, back to the map, breaks and splits allot. If there is a leak the MAP will run it rich. You might check that any day.

Was there any black smoke?
No black smoke...but after I drive it and try to restart it there is a horrible burning/musty/gas like smell.

If I can get it started in the morning I will check the vacuum at the map. From the research that I have been doing some say it could be a vacuum leak somewhere.

Thanks again for all the help!!
Reply
Old Dec 29, 2011 | 12:04 AM
  #21  
DFlintstone's Avatar
CF Veteran
 
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Default

Ok..I just mentioned filling it because the vent tube goes to that solenoid you got a code for, and it might maybe be rich that way. Don't know if it can flood itself with the evap canister, or not.
Reply
Old Dec 29, 2011 | 10:33 AM
  #22  
douglasstorm's Avatar
Thread Starter
Newbie
 
Joined: Dec 2011
Posts: 14
Likes: 0
From: Gilbert, AZ
Year: 1993
Model: Cherokee
Engine: 4.0L
Default

OK guys so this morning started up the jeep and it fired after a real short crank...which is weird. So with it running I took carb cleaner and started spraying it around the injectors to see if I might have a vacuum leak somewhere. Well 1,2,3,4,5 had no change in the sound of the engine but when I hit the 6th injector it idled down alittle. I did it like 3 times and every time it idled down. Could this be a issue?? If so could it be a ring on the injector that is leaking air??
Reply
Old Dec 29, 2011 | 11:14 AM
  #23  
DFlintstone's Avatar
CF Veteran
 
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Default

Yea, mine did exactly that, #5. On my 90 Renix it wasn't that big a deal. Might have hurt my mileage if it was lowering the Vac to the MAP, really can't say for sure. Would stumble or almost miss at idle.
Reply
Old Dec 31, 2011 | 02:09 PM
  #24  
douglasstorm's Avatar
Thread Starter
Newbie
 
Joined: Dec 2011
Posts: 14
Likes: 0
From: Gilbert, AZ
Year: 1993
Model: Cherokee
Engine: 4.0L
Default

Yeah DF that is what mine is doing. So I decided to pull the injectors and check the rings...but they are all ok. No more progress on the 2 big issues but on the bright side I got a chance to clean all the black crud off the injectors and in each hole in the intake!!
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
carverdave
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
8
Sep 1, 2024 08:55 AM
ra.stewart
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
9
Feb 15, 2021 01:47 PM
zumer715
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
10
Oct 3, 2015 07:07 PM
Jeremy Millner
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
10
Oct 2, 2015 02:21 PM
maverick23
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
11
Sep 25, 2015 08:43 AM

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



All times are GMT -5. The time now is 02:41 PM.