89 YJ 258 engine misfiring - JeepForum.com
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post #1 of 4 Old 07-13-2006, 12:57 AM Thread Starter
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89 YJ 258 engine misfiring

I Need Help!!!!
I Purchased A 1989 Wrangler W/258 5 Speed Trans. The Vehicle Was Sitting For 10 Years. I First Put A Fuel Pump On It Ran 4 A Short Time Befor It Misfired. Next Was Tune Up, Then Distributor And Coil Then Computer. I Was Told By Someone That The Carbs On That Year Had Problems So I Put A Weber 38cfm Carb. Runs Good Until It Gets Hot And Runs For A While Then It Misfires. I Pluged A New Ignition Module In To See If That Was It, No Luck I Dont Know What Else To Do Or Replace. Ive Had The Jeep For A Year (toy/hobbie) Playing With It But Its Really Getting Old!! Thanks Mike

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post #2 of 4 Old 07-13-2006, 02:18 AM
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google the nutter bypass,it may or may not fix your problem but it sure wont hurt.

88yj hardtop ,4.2 i6, 3.5 BDS lift,1"daystar bl,165 amp alt. ,homemade1"mml with 33" 12.50 baja claws ,mickey thompson classic locks .aussie locker in front and a warn 8000lb winch.2 kc daylighters on the windsheild,2 55w driving lights on the bumper.pioneer cd and speakers,sound bar and amp.ford taurus fan and tfi ignition upgrade.mc2150 upgrade,discoed.nutter bypass,8.8 rear end ,grant steering wheel.
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post #3 of 4 Old 07-15-2006, 03:59 AM
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Did you consider cat or exhaust problems? How about feul delivery? Did you change filters? How about jet sizes for Weber carb, if higher mileage 38 could be too much fuel.

kevyj87 '87 I6 5spd, 215,000+ miles, Herced, Nuttered, Weber, HEI, RE 4", 1" BL, 4:11's, np231, 33x12.5's, SYE & shaft, 1" brown dog mm, home made bumpers front & rear, Ramsey 8,000lb winch
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post #4 of 4 Old 07-20-2006, 06:56 PM Thread Starter
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possible fuel problem the fuel filter on top of the motor seem to drain down when it sits?
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