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3,640 Posts
I have some trouble getting spark on the old 4.0.
I dont think it is the CPS, I actually have 2 of them on the motor right now (long story, harmonic balancer based with 2 different brackets and 2 different CPS's...) and I cant believe 2 CPS's are bad, but who knows.
The computer was good last I checked, It started a 4.0 not too long ago (troubleshooting someone else's junk)
I have checked the continuity of most of the wires in the harness, I dont believe them to be bad.
Both hall effect sensors get good 8 volt signals, that is one of actionpaintballs frequent suggestions.
I am leaning towards the coil.
The two wires to the coil are "coil driver" grey and dg/or from the auto shutdown relay.
The dark green/orange wire is ground and the grey wire has 12 volts.
What can I do to test the coil besides the ohm tests? How exactly does the coil trigger?
I was suprised to see 12 volts from the coil driver wire. If the coil driver has 12 volts, and the dark green.orange wire is ground from the auto ahutdown solenoid, how does the coil know to fire??
If there is 12 volts to the grey wire is there something wrong in the harness?
Can I test it with a test light to make sure the coil is getting a signal to fire? Is there any way to test fire the coil?
I dont think it is the CPS, I actually have 2 of them on the motor right now (long story, harmonic balancer based with 2 different brackets and 2 different CPS's...) and I cant believe 2 CPS's are bad, but who knows.
The computer was good last I checked, It started a 4.0 not too long ago (troubleshooting someone else's junk)
I have checked the continuity of most of the wires in the harness, I dont believe them to be bad.
Both hall effect sensors get good 8 volt signals, that is one of actionpaintballs frequent suggestions.
I am leaning towards the coil.
The two wires to the coil are "coil driver" grey and dg/or from the auto shutdown relay.
The dark green/orange wire is ground and the grey wire has 12 volts.
What can I do to test the coil besides the ohm tests? How exactly does the coil trigger?
I was suprised to see 12 volts from the coil driver wire. If the coil driver has 12 volts, and the dark green.orange wire is ground from the auto ahutdown solenoid, how does the coil know to fire??
If there is 12 volts to the grey wire is there something wrong in the harness?
Can I test it with a test light to make sure the coil is getting a signal to fire? Is there any way to test fire the coil?