97 xj no spark problems
Thread Starter
Junior Member
Joined: Aug 2011
Posts: 69
Likes: 0
From: New jersey
Year: 1998
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Thread Starter
Junior Member
Joined: Aug 2011
Posts: 69
Likes: 0
From: New jersey
Year: 1998
Model: Cherokee
Engine: 4.0
Yeah pretty sure cause when I press the horn I hear the fuse
Box in the kicker panel inside click and the horn goes off and then the fuel pump fuse is under the hood and the fuel pump kicks on so there should be power to both of them
Box in the kicker panel inside click and the horn goes off and then the fuel pump fuse is under the hood and the fuel pump kicks on so there should be power to both of them
CF Veteran
Joined: Jan 2009
Posts: 1,964
Likes: 6
From: Baltimore, Maryland
Year: 1994 1993
Model: Cherokee
Engine: 4.0
My XJ cut off on the way up the highway today and would not restart. No spark. Turned out some wires up near the front had dropped down and were laying against the exhaust manifold and had finally melted through and grounded out. Freaking sat on the side of Interstate 70 a couple of hours trying to figure it out. 
Another time it turned out the MAP sensor and TPS both had a purple/white wire coming off which combined into a single wire up inside the harness. Somehow the junction of these 2 wires had broke and whenever the MAP sensor wanted to send a signal to the computer it ended up just sending it to the TPS which then read the sudden voltage spike and tried adjusting for it.
When all else fails start thinking "outside the box"

Another time it turned out the MAP sensor and TPS both had a purple/white wire coming off which combined into a single wire up inside the harness. Somehow the junction of these 2 wires had broke and whenever the MAP sensor wanted to send a signal to the computer it ended up just sending it to the TPS which then read the sudden voltage spike and tried adjusting for it.
When all else fails start thinking "outside the box"
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
yay petty sure dont find issues gotta check them with meter or test light
Thread Starter
Junior Member
Joined: Aug 2011
Posts: 69
Likes: 0
From: New jersey
Year: 1998
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Thread Starter
Junior Member
Joined: Aug 2011
Posts: 69
Likes: 0
From: New jersey
Year: 1998
Model: Cherokee
Engine: 4.0
Thread Starter
Junior Member
Joined: Aug 2011
Posts: 69
Likes: 0
From: New jersey
Year: 1998
Model: Cherokee
Engine: 4.0
My XJ cut off on the way up the highway today and would not restart. No spark. Turned out some wires up near the front had dropped down and were laying against the exhaust manifold and had finally melted through and grounded out. Freaking sat on the side of Interstate 70 a couple of hours trying to figure it out. 
Another time it turned out the MAP sensor and TPS both had a purple/white wire coming off which combined into a single wire up inside the harness. Somehow the junction of these 2 wires had broke and whenever the MAP sensor wanted to send a signal to the computer it ended up just sending it to the TPS which then read the sudden voltage spike and tried adjusting for it.
When all else fails start thinking "outside the box"

Another time it turned out the MAP sensor and TPS both had a purple/white wire coming off which combined into a single wire up inside the harness. Somehow the junction of these 2 wires had broke and whenever the MAP sensor wanted to send a signal to the computer it ended up just sending it to the TPS which then read the sudden voltage spike and tried adjusting for it.
When all else fails start thinking "outside the box"

Seasoned Member
Joined: Dec 2010
Posts: 345
Likes: 1
From: So. California
Year: 1991
Model: Cherokee
Engine: 4.0 HO
Thread Starter
Junior Member
Joined: Aug 2011
Posts: 69
Likes: 0
From: New jersey
Year: 1998
Model: Cherokee
Engine: 4.0



