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help with my 4.0 in xj Started all over

3K views 31 replies 10 participants last post by  Dylan 
#1 · (Edited)
Ran great when i parked it last night, today just cranks and cranks, not even a sputter, fuel rail is full of gas, any ideas? Its a 97
 
#10 ·
Turn the key to the on position without starting, you should get a check engine light for about 3 seconds and the fuel pump should run for 2 seconds or so.

If you have no cel/fuel pump/spark your pcm isn't getting power.

If you get a cel and fuel pump runs but no spark its probably ckps/cps issue.


The above applies to obd1, I think the obd2 is setup the same way. I'm sure someone here can confirm.
 
#15 ·
did you even check for spark or just start swapping parts? If you haven't yet checked for spark, do that first. just pull a plug wire and get an extra plug or a spark tool. if no spark, check the coil plug. One wire will be 12v+ with key on and the second should be - pulse while cranking. If you get no spark and the end of the spark plug wire but - pulse at the coil plug, chances are your coil is bad. Before swapping coils, check the wire from the coil to the distributer. If the wire is good, than chances are your coil is bad. If you do not get 12v+ at the coil plug, than you have a short somewhere on that wire you need to find.

If you do not get - pulse at the coil plug when cranking, you need a scan tool that can give you a live feed of the crank/cam signal to make sure they are working fine. Basically there is a few things you can do to actually diagnose the problem instead of just throwing parts at it.
 
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