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post #1 of (permalink) Old 05-24-2005, 09:38 AM
RC51CBR929
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Jeep CJ 7 won\'t fire, coil is fine

my coil is not putting out any fire. The coil and ignition control module are fine.

Could it be something in the distributor (pick-ups) or the ignition switch?
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post #2 of (permalink) Old 05-24-2005, 09:48 AM
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Re: Jeep CJ 7 won\'t fire, coil is fine

if yur cranking and you dont have any spark even from the coil wire, then its either the coil or the ignition module.....so they might not be "fine"

check for loose wires going to and from the ignition module, and those that go to the coil

i dont think it would be distributer related....since the problem is earlier in the system. not sure about ignition switch itself...so i'll let someone else jump in
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post #3 of (permalink) Old 05-24-2005, 10:40 AM
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Re: Jeep CJ 7 won\'t fire, coil is fine

Had both the coil and ignition control module checked both are good and both are fairly new.
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post #4 of (permalink) Old 05-24-2005, 10:52 AM
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Re: Jeep CJ 7 won\'t fire, coil is fine

Can you tell us what's happening? when you turn the key, what happens? any noises, does it turn over and just not fire? have you checked other things like are you getting gas to teh engine? Did you happen to flood it? The more info the better. you may have been thru all this, but we don't know the circumstances.
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post #5 of (permalink) Old 05-24-2005, 11:18 AM
 
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Re: Jeep CJ 7 won\'t fire, coil is fine

Can you tell us what year CJ7. There is a difference in control modules (prestolight vs DuraSpark), whether or not a computer is involved, what type of distributor, Even Engine size. It would be easier to start "what to check" for your year.

Do you have a DVM to take some measurements or at least a test light.
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post #6 of (permalink) Old 05-24-2005, 12:01 PM
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Re: Jeep CJ 7 won\'t fire, coil is fine

Coil and module are fine? Makes me wonder about how they were checked.

Have you recently messed with the wires around the starter or solenoid? Sometimes those wire get loose - or mixed up - and short out the ignition.

But - assuming they are -
KEY ON -- Check for voltage at the (+) side of the coil - should be around 7 or 8 volts. If not, find out why.
Check that same point during cranking to make sure it's the same or higher during cranking.

KEY ON - Check the red wire at the module - should be 12v.
Check the black wire at the module - should be 0

If both of those are OK, then:
Disconnect the connector from the distributor.

IF it's a 2 wire connector (Prestolite):
KEY ON -- Take the HARNESS side of the connector - the exposed terminal - scratch it on ground to see if it will cause the coil to fire. If yes that says the module and everything else is fine - problem is inside the distributor.

If it's the 3 terminal connector (Ford) - put an analog - meter type, not digital crap - voltmeter on the orange and purple wires coming out of the distributor. During cranking the needle should swing wildly on a low voltage scale. If not, pick-up coil.
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