Need help...XJ won't start...
#1
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Year: 1991
Model: Cherokee
Engine: 4.0 I6
Need help...XJ won't start...
This weekend I put a new crate motor in...All went well but now it will not start..It will sit and turn and turn and will not start..
I have replaced coolant temp sensor, CPS, waterpump, ignition coil, new plugs, wires, cap rotor, fan clutch, CCV/Vacuum parts, and I think that's about it.
When I pull a plug and watch it spark I get a single spark and then nothing at all.. Basically the spark is intermittent.. I am at a loss as to what it could be and hoping someone can help.
I have replaced coolant temp sensor, CPS, waterpump, ignition coil, new plugs, wires, cap rotor, fan clutch, CCV/Vacuum parts, and I think that's about it.
When I pull a plug and watch it spark I get a single spark and then nothing at all.. Basically the spark is intermittent.. I am at a loss as to what it could be and hoping someone can help.
Last edited by okcjeeper; 05-26-2008 at 04:30 PM.
#4
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Year: 1999
Model: Cherokee
Engine: 4.0 HO
With my experience on rebuilding 4.0's...sometimes it takes quite some time for the lifters to pump up...does it sound like you are getting compression? Or is it just free spooling?
#6
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Year: 1991
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Kyle, When you say electronics do you mean sensors? If so I have changes the CPS, Coolant sensors, O2 sensor...I am going to take the starter, alternator and battery down to get tested tomorrow..
89xjgrey, Yeah I thought about that but the motor has been dyno tested and had oil and water ran through it by the shop that built it..Also I have tried and tried to start it..It just keeps turning but never seems to fire up. Has intermittent spark as well..
Now though I get nothing..no turn over or anything...headlights work and that damn annoying buzzer works other then that nothing else works...I have checked all the ground points and they are as they were before swap..I took some good pics so I could compare to be sure..
89xjgrey, Yeah I thought about that but the motor has been dyno tested and had oil and water ran through it by the shop that built it..Also I have tried and tried to start it..It just keeps turning but never seems to fire up. Has intermittent spark as well..
Now though I get nothing..no turn over or anything...headlights work and that damn annoying buzzer works other then that nothing else works...I have checked all the ground points and they are as they were before swap..I took some good pics so I could compare to be sure..
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Year: 1990XJ/1989MJ
Model: Comanche
Engine: 4.0L Renix
Have you looked into the possibility that the cam position sensor may be bad or loose. My timing was off 180 degrees on my crate engine, and my cam position sensor was faulty. Mine is a Renix and may be completely different but that would be my next thing to check.
Good Luck, let us know when you get 'er fired up!
Good Luck, let us know when you get 'er fired up!
#9
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Year: 1991
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I am going to replace the cam position sensor today....We'll see if that works or not..atm though even when I turn the key I get nothing so it won't even turn over now..
#10
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Year: 1990XJ/1989MJ
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Blue
#11
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Year: 1991
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Yeah when I turn the ignition it just doesn't do anything..almost like the starter isn't engaging or something so time to start with that and work my way back to the ignition..
#12
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Year: 1990XJ/1989MJ
Model: Comanche
Engine: 4.0L Renix
Good luck, grounds very often are an XJs biggest headache.
Blue
#13
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Year: 1991
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Ok it turns over I had just done something goofy...anyways...Anyone have any idea on how to disassemble the distributor in order to replace the cam position sensor?
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Year: 1990XJ/1989MJ
Model: Comanche
Engine: 4.0L Renix
Pull the cap and rotor and there it sits. Two screws IIRC and out it comes. Reconnect the wire from the new one and put the two hold down screws back. Then re-install the rotor and cap........voila! DONE
#15
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Year: 1991
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Wish it was that easy...remove the 2 screws on top and you have another plate ontop of the sensor and don't know how that comes off...