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.

Cherokee boggs and backfires and wont go above 15 mph!!!

Thread Tools
 
Search this Thread
 
Old Apr 28, 2012 | 11:10 AM
  #76  
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

Originally Posted by hypedonmonster
tested my cps just now with it unglugged from the harness and it wasnt even registering ANY ac volts
Originally Posted by cruiser54
It is checked while cranking at the plug going TO the CPS.
If you put your feet out under the passenger side, you can reach up with your left to hold things, and your right ends up back by the cross-member with the ratchet.
7/16~11mm, to 3-in. extension, to swivel, to Looong 18, 24 inches of extension.

If you tie a long string on the plug of the old one, you can use it to hoist the new one up.

If your left forearm is larger than a Qt. mason jar, you might want to remove the front drive line...

Gotta see it generate at least.... .4, cranking. With that, and that "blue sparking" kind of coil, maybe you have it!

39 psi is too much. will the wrong pump even fit in a Renix jeep? How high does it go with the vacuum line off the regulator?
Reply
Old Apr 28, 2012 | 12:48 PM
  #77  
hypedonmonster's Avatar
Thread Starter
Member
 
Joined: Mar 2012
Posts: 122
Likes: 0
From: Plaza, ND ..... Unfortunately
Year: 1992
Model: Cherokee
Engine: 4.0 I6
Default

No, I checked three times to make sure I was testing the CPS and not the harness side. It was litterally reading 0 a/c volt when cranking. And my fuel pressure raises to about 42~43psi with the vac off of the fpr. I'm just going to change my CPS today just to make sure. I already swaped the coolant temp sensor, iac, fpr, A NEW O2 SENSOR, distributer, distributer cap, coil, wires, not plugs because i just bought those and their still good, injectors, fuel pump relay, tested fuel pump b-resistor checked out ok, no cloged fuel/vac lines. Im really running out of options. I really have to get this running this weekend so please keep the answers coming!
Reply
Old Apr 28, 2012 | 03:22 PM
  #78  
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

Boy, your busten your butt here. I can only plod through the basics. Gotta see 1/2 a volt or so AC from that cps. Also that out of speck fuel pressure might be doing something weird I don't understand. Sounds like the wrong pump? Is that possible? I believe the ECU controls pulse duration assuming it's at a cirtan pressure. With it different I couldn't guess what would be the end result.

Mine runs fine with the cam sensor in the distributor un-plugged. It just "helps" the CPS, you don't actually need it. Idk if something could short there or something and trouble. You could see if unplugging it helps. I doubt it.

Also you didn't mention the Intake air Temp sensor on the manifold. That's the one I coufused with the coolant temp sensor CPT needed to un-plug.

It's resistance specs are the same as the ECT. 7,500 @40*, 3,400@70*, down to 185 boiling.

Maybe if it's toast is why it *** up warm?

Anyway, first you wanna see numbers that make sense from the CPS.
Reply
Old Apr 28, 2012 | 03:22 PM
  #79  
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

Wait. 38 Lbs that only goes up to 42? Could he have a vacuum issue, or a faulty/incorrect FPR?

Last edited by DFlintstone; Apr 28, 2012 at 03:29 PM.
Reply
Old Apr 28, 2012 | 09:59 PM
  #80  
hypedonmonster's Avatar
Thread Starter
Member
 
Joined: Mar 2012
Posts: 122
Likes: 0
From: Plaza, ND ..... Unfortunately
Year: 1992
Model: Cherokee
Engine: 4.0 I6
Default

wooooooooooooo!!!!!! got er runnin'!!!!!!! and guess what, it was the part that everyone, including me, didnt think it was going to be....the crank position sensor. thanks to everyone that helped me! im happy that i have my baby back, Thanks a million you guys!
Reply
Old Apr 28, 2012 | 11:34 PM
  #81  
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

Originally Posted by lukeincolorado
Sounds like a crappy cps.
Me; "Guess I have heard talk of the CPS failing warm/hot. Usually stalling though. Cutting out. doubt it. Just takes a minute though."

Don't forget Luke! Right On! No doubt going through some of that will pay off down the road. Well done, and thanks for getting back
Reply
Old Apr 28, 2012 | 11:43 PM
  #82  
hypedonmonster's Avatar
Thread Starter
Member
 
Joined: Mar 2012
Posts: 122
Likes: 0
From: Plaza, ND ..... Unfortunately
Year: 1992
Model: Cherokee
Engine: 4.0 I6
Default

Who's Luke?
Reply
Old Apr 29, 2012 | 01:06 AM
  #83  
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

Originally Posted by lukeincolorado
Sounds like a crappy cps.
^That Luke! ^, post#37
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
RunnerInPink
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
25
Oct 10, 2017 10:34 AM
Gtrsrlly
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
Aug 25, 2015 11:50 AM
mjcxking
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
11
Aug 23, 2015 07:55 PM
zhunt728
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
Aug 20, 2015 12:37 PM

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



All times are GMT -5. The time now is 09:10 AM.