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Old 05-15-2011, 09:27 PM   #1
Jeep_VT's Avatar
Join Date: Apr 2011
Location: Vermont
Posts: 98
Help!! Misfiring!!

I'm having a problem with my 97 TJ 4 cylinder. It will miss on one cylinder. It first started having problems on cylinder four, and then it switched to cylinder one. I've swapped plugs on cylinder four , and had a brief repair (about 10 miles) and then the problem returned. I put in a new cap and rotor, and switched out the PCM. I also unplugged the up stream o2 sensor still no luck! It always misfires no matter the speed! I also put cleaner through fuel injectors! Any suggestions?

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Old 05-16-2011, 05:04 PM   #2
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Join Date: Jun 2009
Location: Bay Area
Posts: 554
Did you do a compression test? If not, then do it. It will tell you how your engine is mechanically.

98 TJ 4.7 Stroker!!! Unichip tuner, HPD30/D44, 4.56, Detroit Locker in rear axle, 3.25RC SL, 1.25BL, 1MML, 35x12.50x15, Cager Softs 15x8, XRC10 winch, Rancho 9000XL shocks with wireless remote
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Old 05-17-2011, 11:46 AM   #3
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Join Date: Apr 2011
Location: Vermont
Posts: 98
My problem has been fixed!!! I did not do a compresion test though. Thanks for the response! I replaced my cap and rotor, which got rid of one of the problems, but another plug had been fouled since the engine was running so poorly. So i replaced that plug, and am now back in buisness!!
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