Stock 4.0L motor, and benefit to upgrading ignition coil? - Jeep Wrangler Forum
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Old 05-27-2008, 09:15 AM   #1
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Stock 4.0L motor, and benefit to upgrading ignition coil?

Still eliminating my misfire and other problems, may replace coil today. Any benefit to 'upgrading' to anything other than the stock coil? I've hard rumors of improved mileage by being able to gap plus at 0.65 etc. THoughts?

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Old 05-28-2008, 12:13 AM   #2
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My mechanic doesn't think it's worth it. He says its all hype. Stay with stock parts spend $$ somewhere more productive.

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Old 05-28-2008, 12:19 AM   #3
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no improvement.. buy a stock one. however I would like to know more about the spark plug gaping
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Old 05-28-2008, 12:26 AM   #4
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While troubleshooting a misfire problem several years ago, I installed an Accel ignition coil. No difference whatsoever... in anything.
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Old 05-29-2008, 10:41 PM   #5
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While troubleshooting a misfire problem several years ago, I installed an Accel ignition coil. No difference whatsoever... in anything.
Put in a stock coil, no change, still misfires.....

Saw you mentioned chasing a misfire problem before, any hints? My cyl 4 misfire has migrated to now being cyl 3 and cyl 6. I'm at a loss what it may be at this point, changed coil, plugs, wires, rotor, cap, distributor etc. Any thoughts?
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Old 05-29-2008, 11:57 PM   #6
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So Jerry, the bigger spark makes no difference then? Not something i expected to hear but its good to know. Thanks.

On seconds thought did you swap in bigger gap plugs?
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Old 05-30-2008, 12:39 AM   #7
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It's not a "bigger spark" from the Accel coils, its more voltage. And unless you use the wires and plugs, and rotor and cap, there won't be any difference... and it's not about making more power, it's about efficiency.
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Old 05-30-2008, 12:40 AM   #8
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well with more voltage it allows one to run a spark with a bigger gap.. thats what i meant by bigger spark.
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Old 05-30-2008, 01:51 AM   #9
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So you went from a cylinder 4 misfire to a random misfire???Now what all have you tried other than the coil???Like plugs,wires rotor,cap,ran a noid test on injectors???Truthfully going to a random misfire is a good thing because normally a consistent misfire on one cylinder sometimes leads to burnt or bent sticking valve,cracked compression ring,badly scared cylinder wall,cracked head and a few other things.As bad as it is it could still be one of a few of those things but less likely now that it has switched to another cylinder.Anyway if not allready done I would get a noid test light set and check the injectors.
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Old 05-30-2008, 11:36 AM   #10
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So you went from a cylinder 4 misfire to a random misfire???Now what all have you tried other than the coil???Like plugs,wires rotor,cap,ran a noid test on injectors???Truthfully going to a random misfire is a good thing because normally a consistent misfire on one cylinder sometimes leads to burnt or bent sticking valve,cracked compression ring,badly scared cylinder wall,cracked head and a few other things.As bad as it is it could still be one of a few of those things but less likely now that it has switched to another cylinder.Anyway if not allready done I would get a noid test light set and check the injectors.
Changed plugs, distributor, cap, rotor, wires, Seafoamed it, Lucas Injector cleaner in tank, new battery, new coil, cleaned throttle body, cleaned IAC, so far. Going to get a multimeter and check the CPS today, will look into the injectors more after that.
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Old 05-30-2008, 04:11 PM   #11
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you can also measure the injectors too while you're at it to make sure no injector is off with a different reading.

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