Constant Misfire on Cylinder 1 in 1997 ZJ 4.0 - Page 2


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Old 07-29-2019, 10:44 AM   #16
Mattman99
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Got the head gasket replaced and the misfire is gone and it runs much better now, just need to source out 2 manifold bolts to get rid of my slight exhaust leak at the manifold. Thanks for the help.
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Old 08-02-2019, 05:28 PM   #17
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This thread is not good reading for me. Lol. Glad you got yours fixed, the problems all sound very similar to mine except my oil and coolant are both clear and clean. Oh boy.

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Old 08-02-2019, 06:43 PM   #18
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So... quick update, I have been monitoring my check engine codes since I did the head gasket and the misfire on cylinder #1 IS BACK. It used to be just a slight misfire on startup and then nothing, now it is back in full swing again and my coolant and oil are normal colored. Could it be linked to the DTC P0132 (O2 sensor reading rich because of the exhaust manifold leak from the 2 missing bolts) or should I do the other 5 injectors and do completely new plugs and wires? The plugs it has are relatively new but I don't know how new, and the plug wires are also relatively new.
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Old 08-09-2019, 08:46 AM   #19
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My "mis-fire" was at idle and turned out to be loose bolts holding the torque converter in place. It was wobbling at idle and self centering at higher revs. Took to my local trusted mechanic after my limited troubleshooting skills were exhausted and he pulled the inspection cover and found the loose bolts. Once the 3 bolts were tightened the "mis-fire miraculously went away. Got it fixed just in time before the torque converted went AWOL.
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Old 08-09-2019, 10:41 PM   #20
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Nice find...Thanks for the update...
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