91 yj 4.0, no spark need help - Jeep Wrangler Forum

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Old 05-10-2010, 09:39 AM
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Angry 91 yj 4.0, no spark need help

hey guys im new here, bought a 91 yj and it will not throw any spark, i put in a new distributor, coil, crank sensor, ecm and spark plugs. still will not throw spark. the gas was low when it last started, i felt a sputter in the engine that felt like spark plugs were bad. ever since it was low on gas, and i changed the spark plugs it will not start, i have taken it to a shop, they tested everything on a bench, 100% working, put it back in and it will not throw any spark. please help me!!!
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Old 05-10-2010, 10:58 AM   #2
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double check everything you hooked up... triple check if needed. Just to make sure...

...still thinking...

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1994 Wrangler YJ I6 4.0 H/O Auto 3 spd. 3:55 Gears
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Old 05-10-2010, 06:45 PM   #3
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I know your agony, I'm going to replace every fuse I can find on mine next. After that I guess ill start rebuilding the harness (IE: sell it and buy a new one)
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Old 05-12-2010, 07:08 PM   #4
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i had the same problem may not be the case with you but anyway if you look on your steering colume you will see a wire harness that is fastened to the colume it self.make sure the two connections are pushed together well.you will have to get in some very odd postions to see it or take the dash apart,i just took out my speedo.i found this problem out when my dad was checking the wires on the inside while i was checking the motor.when i heard him turn it over i grabbed onto the spark plug that we had out for testing i was so use to there not being any spark but let me tell you boy when that jeep started i felt alive for the first time in my life it was by far the worst shock i EVER got.also if there is no problem there check your relays i also had a similar problem with a sticky relay.
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