2000 Cherokee starting issue sometimes
#1
Newbie
Thread Starter
Join Date: May 2022
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
2000 Cherokee starting issue sometimes
2000 xj, sometimes starts and runs fine, sometimes runs rough and miss fires and will sneeze out of the intake. So far the crank sensor has been replaced, cam sensor has been replaced, fuel pump, air idle control valve, injectors removed and cleaned up(video posted was before cleaning). Removed coil rail and tested all 6 cylinder for spark when cranking. Throttle position sensor tested from battery ground to signal wire 5vdc. Signal wire to ground .3vdc to 4.8 WOT.smooth voltage increase when opening throttle. any further recommendations? Ran fine when I purchased it a month ago and has progressively gotten worse. Fuel tank has been dropped pumped out and cleaned with fresh fuel added and some sea foam treatment.
Edit: spark plugs have been replaced with double platinum champion plugs and no vacuum leaks(checked with starting fluid around all hoses and gaskets)
Edit: spark plugs have been replaced with double platinum champion plugs and no vacuum leaks(checked with starting fluid around all hoses and gaskets)
#2
CF Veteran
Join Date: Oct 2015
Posts: 7,412
Likes: 0
Received 1,557 Likes
on
1,197 Posts
Year: 2000
Model: Cherokee (XJ)
What plugs were in it before you replace them?
I will only use Champion Copper Tops in my '00.
438's.
I will only use Champion Copper Tops in my '00.
438's.
#3
Newbie
Thread Starter
Join Date: May 2022
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
#4
CF Veteran
Join Date: Oct 2015
Posts: 7,412
Likes: 0
Received 1,557 Likes
on
1,197 Posts
Year: 2000
Model: Cherokee (XJ)
IMO those fancy plugs do not belong in an XJ.
If this were me I would go back to some Copper Tops, new, and see what happens.
#5
CF Veteran
Join Date: Nov 2010
Location: In the middle of Minnesota!
Posts: 5,813
Received 104 Likes
on
92 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Have you tested your fuel pressure with a fuel pressure gauge? Saw that you cleaned it but pressure needs to be verified with a gauge. Spec for the 2000 is 49.2 psi, plus or minus 5 psi. Needs to be ruled in or out....
The following users liked this post:
cruiser54 (05-23-2022)
Trending Topics
#8
CF Veteran
Could even be as simple as a loose bolt on a ground, connection or cable..
- And brand of CPS replacement?
- when you say "sometimes runs rough", is that on start up only or also whilst driving?
- And brand of CPS replacement?
- when you say "sometimes runs rough", is that on start up only or also whilst driving?
Last edited by Roler; 05-24-2022 at 07:16 AM.
#9
Senior Member
https://www.cherokeeforum.com/f67/va...m-foil-265302/
Investing in the insulation, in addition to the above trick, may be worthwhile if your OEM insulation is missing...
Investing in the insulation, in addition to the above trick, may be worthwhile if your OEM insulation is missing...
#10
Newbie
Thread Starter
Join Date: May 2022
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
#11
Newbie
Thread Starter
Join Date: May 2022
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
#12
Newbie
Thread Starter
Join Date: May 2022
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
#13
Newbie
Thread Starter
Join Date: May 2022
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
#14
Newbie
Thread Starter
Join Date: May 2022
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
#15
Newbie
Thread Starter
Join Date: May 2022
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
https://www.cherokeeforum.com/f67/va...m-foil-265302/
Investing in the insulation, in addition to the above trick, may be worthwhile if your OEM insulation is missing...
Investing in the insulation, in addition to the above trick, may be worthwhile if your OEM insulation is missing...