2005 WK 3.7 w/ 80k #2 Cyl. Misfire...still. Help?! - Jeep Garage - Jeep Forum

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Old 07-19-2014, 12:23 PM
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Angry 2005 WK 3.7 w/ 80k #2 Cyl. Misfire...still. Help?!

This is my first post. Oddly enough, I've been a member for like 3 damn years, been saved thanks to this site and it's members, but never posted... I am ashamed of myself

Anyways. Here we go:

2005 WK w/ 80k on the clock. Last Friday I was on my way home from work, stuck in traffic on I-75 South as usual (Cincinnati) and my engine idle began to fluctuate between 500rpm - 600rpm with a noticeable pattern. Never stalled, just idled rough. Drove another 20 miles home with no noticeable loss of power and or fuel economy. Saturday morning I left for the unit armory in Maysville KY, approx. 55 miles from my home (I'm an Army Reservist). Again, rough idle at, well, idle lol but Jeep performs perfect under load/acceleration and no additional signs/symptoms of a greater issue. Once at the armory and once I had the time to do so, I ran up to the local autoparts shop for a diagnostic check. Enroute to said shop, engine light came on, first time since the issue arose. Scanner spit out a #2 Cylinder Misfire code (which a competing shop verified... gotta check your work!) so I replaced the plugs which did nothing, so I then replaced the coil and added a bottle of Lucas to the fuel tank with the same results. I then called my father who is a mechanical genius, he grabbed his super-mechanic cape and flew to the rescue...in an Oldsmobile. Rad huh?! Well we checked everything you could think of, many of which were suggested right here but to no avail.

Fast forward to Monday morning, we dropped it off at the local "family owned" Zimmer CJD stealership hoping for nothing more than greater disappointment and financial molestation which they gladly provided. I directed them to simply diagnose the problem and report back to me before moving on to Stage II aka wallet rape. I did most if not all of the work for them by providing all of the aforementioned info ^ to the service manager, and was just hoping they could pinpoint the issue with their super advanced highspeed black magic computers. So, literally 5 days later and exactly $411.62 later they call me to notify me of what they had discovered. Wait for it....wait for it.... ummm, you guessed it a #2 Cylinder Misfire!!! For realz?! That's all they could come up with?! The printout they gave me reads as follows:

..."PCM Fault P0302 Idles rough. Remove #2 plug and check compression measured @ 75 psi. Perform cylinder leakage test, only had 5% leakage no air coming out of exhaust or intake valve. Perform wet compression test, cylinder had 200 psi. remove right side valve cover, rocker arm rollers were extremely pitted and cam shaft lobes were also damaged on #2 cylinder. Also all lobes showed signs of oil starvation. This issue in not causing the misfire. PROBLEM IS IN LOWER ENGINE CAUSING LOW COMPRESSION."

THEN, when I arrived at the stealer I asked to speak with the service mgr. to ask how they came to their conclusion. He said that one of their big brained techs believed that it could be the head gasket because he believed that it had been run too hot. It can't be the head because it's contained to only one cylinder, right?! Plus, if it was a true "misfire" it would get worse under acceleration not BETTER! Also, it's NEVER EVER overheated or come close to overheating, and I've lost zero coolant. The service manager then had the balls to give me his "personal advice"...ready... "If this was my vehicle, at this point I'd just go ahead and throw a new engine in it." I was floored. I paid you all that money for you to just regurgitate the information I gave you when I dropped it off?! I got sooo mad that I even pulled the Veteran card which I've never done! I told them too button it all up and I drove it home.

I'm stuck at this point and begging for help! Pa-rease help me....I'm a Veteran dammit lol!

Thanks in advance,

Matthew

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Old 07-19-2014, 01:27 PM
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Re: 2005 WK 3.7 w/ 80k #2 Cyl. Misfire...still. Help?!

Trying to think with you, lets see if we can come up with something.
If there is no oil or not enough oil going to the #2 cams, it is maybe also not going to the hydraulic valve lash adjusters. A gap between rocker arm and valve will shorten the valve opening time and reduce the amount of fresh air coming in, or exhaust gasses to go out. So i would first look to find out what is causing the lack of oil at the head. An oil pressure test would be my first idea. Did they also remove the other side valve cover, to see if it shows lack of oil as well? Does the engine not make more mechanical noises then it did before?
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Old 07-19-2014, 03:38 PM
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No, there's no knock or noise of any kind. I don't think they did...I wouldn't be surprised if they didn't take either valve cover off lol!
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