P3301 and 02 misfire code
11-23-2016, 07:06 PM
#1
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Location: Kettering, Ohio
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Year: 1998
Model: Cherokee
Engine: 4.0
P3301 and 02 misfire code
Recently did a tune up plugs, wires, cap and rotor a few days after that I got CEL read the codes and misfire again, what could it be now?
11-24-2016, 05:55 AM
#3
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Year: 1999
Model: Cherokee
Engine: 4.0
How many miles on the engine? Other things to consider:
1. Fuel injector. Swap the injector from the misfiring cylinder with another one and see if the misfire follows to that cylinder. You can also use a "noid light" to be sure that you are receiving a pulse from the computer to fire that injector.
2. Internal engine issue. Perform a compression test on all cylinders and compare misfiring cylinder compression to other cylinders
1. Fuel injector. Swap the injector from the misfiring cylinder with another one and see if the misfire follows to that cylinder. You can also use a "noid light" to be sure that you are receiving a pulse from the computer to fire that injector.
2. Internal engine issue. Perform a compression test on all cylinders and compare misfiring cylinder compression to other cylinders