no spark !!!!!!
Thread Starter
Junior Member
Joined: Nov 2011
Posts: 54
Likes: 0
From: bonney lake, wa
Year: 1991
Model: Cherokee
Engine: 4.0 h.o
All fuses are good after searching more sounds like it could be the camshaft position sensor aka pickup coil will find out tomorrow.
CF Veteran
Joined: Aug 2010
Posts: 1,168
Likes: 4
From: Williamsport, Pa
Year: 1997
Model: Cherokee
Engine: 4.0L
I'm not clear on exactly what your getting, but it sounds like the fuel pump only works if you "jumper" the relay. If that is the case the cam sensor is not your first problem as the fuel pump is primed as soon as the key hits the ignition position- at which point the cam sensor isn't doing anything yet.
Work the problems in order, it'll make life much easier.
Work the problems in order, it'll make life much easier.
CF Veteran
Joined: Aug 2010
Posts: 1,168
Likes: 4
From: Williamsport, Pa
Year: 1997
Model: Cherokee
Engine: 4.0L
I think the point I was making is IF you only get fuel because you jumper the relay for the fuel pump then you have bigger problems than a cam sensor. Keep in mind the ECM contols a lot of things. Most of them must work in order for the Jeep to start.
Do you have a FSM? The manual tells you how to check these sensor and eliminate things in a specific order. You might find that the BECAUSE the circuit that powers up the fuel pump normally isn't working, that the EMC may be telling the other parts of the ignition system to not work also.
As I read through your thread the last thing I saw about the fuel pump is that you could get it to run if you jumpered the relay. You didn't say you fixed that problem yet.
Do you have a FSM? The manual tells you how to check these sensor and eliminate things in a specific order. You might find that the BECAUSE the circuit that powers up the fuel pump normally isn't working, that the EMC may be telling the other parts of the ignition system to not work also.
As I read through your thread the last thing I saw about the fuel pump is that you could get it to run if you jumpered the relay. You didn't say you fixed that problem yet.
Thread Starter
Junior Member
Joined: Nov 2011
Posts: 54
Likes: 0
From: bonney lake, wa
Year: 1991
Model: Cherokee
Engine: 4.0 h.o
All new relays and senors: cam and crank, cap/rotor and pcm. Checked grounds and ballist resister going through the harness but still can't figure it out also changed ignition switch......what gives
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