What is going on?! 01 WJ - Jeep Garage - Jeep Forum

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Old 02-20-2017, 09:25 PM
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What is going on?! 01 WJ

So my WJ started ticking pretty bad. Ended up taking the valve cover off and checking to make sure nothing was loose. Nothing was. But the build up in there was pretty bad. I clean it up and put it back together. After that I start it up and could tell it was missing a little and engine light comes on. Throws a code p0300 I think. Missing on multiple cylinders. I come back out the next day to check out the fuel injectors to see if they are getting power. They all were. So I check my coil pack(which is new) and plugs(also new). Everything is good. I replaced the plugs again anyways. I figured I'd change the oil because of the ticking. When I changed the oil it looked like it had not been changed in a long time. I've only had the jeep maybe a month. About 2 quarts came out normal and the rest was thick and clumpy. Anyways I put fresh oil in and some Lucas. I also run a bottle of sea foam through the intake. Start it up again and it says missing in cylinder one and five. Turn it off and go inside for a few to research. Come back about 20 min later and crank it up and everything is perfectly fine. No missing, no ticking at all. What could cause that? PCM going out?


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Old 02-21-2017, 06:34 AM
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Re: What is going on?! 01 WJ

Seems that the jeep was badly maintained in the past. I would try another seafoam treatment. Did you let it do its work for an hour or so before starting it up again? Sometimes the carbon buildup on the valve stems can be such, that a single seafoam treatment will not get rid of it all.
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Old 02-21-2017, 01:14 PM
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Re: What is going on?! 01 WJ

I let it sit for probably 30 min. I'm gonna drive it for another week and drain my oil again to see if that helps because it was bad before. I'll put some of that red bottle treatment in it before I drain it and also I'll put some more sea foam in it.


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