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1996 cherokee 4.0 staight 6. number 1 cylinder not firing

   
Old 09-10-2009, 04:14 PM
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Year: 1996
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Engine: 4.0 straight 6cyl
Post 1996 cherokee 4.0 staight 6. number 1 cylinder not firing
i recently bought a used cherokee. had bad PCU changed that and started right up but was only running on 5 cyl, so i changed the cap, rotar, plugs, and wires. when that didnt work i changed the timing chain and gears, still number 1 not firing. ive checked and the plug will spark on the block and the injector is spraying fuel. both o2 sensor wires were cut by previous owner and it smells like the catalytic converter is going out could either of these be the cause. any help would be nice
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Old 09-10-2009, 04:47 PM
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Any error codes?
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Old 09-10-2009, 05:29 PM
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Originally Posted by FrankZ
Any error codes?
yea but its going to because the o2 sensors are both gone and the pcu i put in is used from a 98 cherokee
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Old 09-10-2009, 05:35 PM
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You need to do a compression test on the #1 cylinder.
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Old 09-10-2009, 08:53 PM
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i did its running between 75 and 80 psi
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Old 09-10-2009, 08:56 PM
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There's your problem Brother. Anything less than 90-95 and it ain't gonna fire.
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Old 09-10-2009, 08:57 PM
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Whats the compression on the other cylinders?
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Old 09-10-2009, 09:02 PM
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other cylinders running 100-115
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Old 09-10-2009, 10:17 PM
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Yikes... Sounds like its time for a stroker...
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Old 09-10-2009, 11:35 PM
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And I've got one for sale.....
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