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Old 04-30-2011, 11:46 AM
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wj engine codes and possible cure please

i have a wj, which engine light comes on and stays on, ive checked the codes and p/ 300.302.304 are on, anybody any thoughts????
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Old 04-30-2011, 11:58 AM
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Re: wj engine codes and possible cure please

sorry guys, should also say 4.7 HO overlander with lpg, and a 2002
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Old 04-30-2011, 12:11 PM
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Re: wj engine codes and possible cure please

When you go to the trouble shooting part, there is a complete list of DTC codes.
But now in your case, 300 means misfire detected, 302 misfire cylinder #2 and 304 misfire cylinder #4.
I would start pulling plug #2 and #4 and check how they look like. Compare them to the one of an other cylinder. Maybe you have coolant leak into the cylinders and you will see washed plugs (cleaner then the others). (#2 cylinder is the first one on the left bank, when standing in front of the car, #4 is the second one on the left bank, when standing in front of the car.)
There can be other reasons, but start with this.
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Old 04-30-2011, 12:16 PM
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Re: wj engine codes and possible cure please

welcome!!
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Old 04-30-2011, 02:59 PM
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Re: wj engine codes and possible cure please

Welcome bro and x2 what Frank said
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Old 04-30-2011, 09:24 PM
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Re: wj engine codes and possible cure please

Spark plugs are a wonderful place to start!

Is it a hard misfire? Like it runs like crap and shakes all over? If so it could very likely be dead lifters.... not that the lifters cause the misfire, but when they dont pump up as they should they allow the rockers to fall out and viola, you have not valve opening... see it decently regularly on the wj 4.7 (will probably end up being a regular occurance on the WK too, when they get more miles and age on them).
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Old 05-01-2011, 12:34 AM
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Re: wj engine codes and possible cure please

thanks guys will check the plugs, and theres no problem with the running as it purrs like a dream and goes well too.
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Old 05-01-2011, 12:46 AM
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Re: wj engine codes and possible cure please

Have you recently replaced the CKP sensor? On my '96 ZJ, I replaced my CKP sensor with an aftermarket sensor and was getting P0300, P0301, P0302, P0303, P0304, P0305 and P0306. It went away when I replaced the CKP sensor with one from the dealer. Just a thought...
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Old 05-07-2011, 07:32 AM
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Re: wj engine codes and possible cure please

phew , what a relief, took to local jeep dealer, found two spark plugs at fault, changed them and away we go.
now to get on with some mods for car, thanks too all that took the time to sugest some items at fault
stu
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