Wrong flywheel help! 89 YJ - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 07-26-2002, 06:40 PM
Wrangler88
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Wrong flywheel help! 89 YJ

my buddies got a 89 yj 2.5L stick, we swaped in a 2.5L from an 84 cherokee, not thinking i used the flywheel from the cherokee, and now the jeep won't start, it turns over but i've got no spark, the ignition system on the YJ runs off a flywheel sensor, i noticed when installing that the flywheels where different but didn't think anything until now when it won't start, can i just get the sensor from the cherokee and splice it into the YJ, i don't want to rip it all out again and change the flywheel, anyone help!! i need this out of my garage! oh yeah and the difference between the flywheels was, that one had more block on the flywheel, not the ring gear.behind the ring gear
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post #2 of (permalink) Old 07-27-2002, 08:34 AM
 
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Re: Wrong flywheel help! 89 YJ

'84 Cherokee's had carberators, so their flywheels don't have the 3 notches that the Crank Position Sensor needs to see to control the ignition. I hate to say it, but I think you'll have to swap the flywheels again [img]images/icons/tongue.gif[/img]
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post #3 of (permalink) Old 07-29-2002, 02:26 AM
Wrangler88
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Re: Wrong flywheel help! 89 YJ

woops! my bad we used a flywheel from a 91 YJ, sorry i've got too many pieces of such lying around... still anyone have any ideas!? come on guys, i know someone can answer this one! can i just buy a sensor from a 91 or new yj and spice it into the 89's harness, the sensor unplugs, just where it plugs in looks different...anyone HELP!
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post #4 of (permalink) Old 07-29-2002, 08:42 AM
 
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Re: Wrong flywheel help! 89 YJ

The fuel-injection system switched in '91 to the Mopar version, so I'm betting the flywheels are different from that year on.
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