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

Go Back   Jeep Garage - Jeep Forum > Jeep Technical Discussion > Troubleshooting/Problems Discussion

Join Jeep Garage Today
Thread Tools Display Modes
Old 07-19-2014, 12:23 PM
New Member
Join Date: Feb 2013
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
WKBrock is on a distinguished road
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,


Reply With Quote
Sponsored Links
Old 07-19-2014, 01:27 PM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
Join Date: Dec 2009
Location: Brazil
Posts: 7,425
Thanks: 18
Thanked 386 Times in 373 Posts
Rep Power: 529621
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
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?

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
Old 07-19-2014, 03:38 PM
New Member
Join Date: Feb 2013
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
WKBrock is on a distinguished road
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!
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Coolant disappears.. Misfire cyl 1, 2 and 3 AudreyHell Troubleshooting/Problems Discussion 12 07-31-2013 01:08 AM
misfire cyl. 1 jeepsterjohn Troubleshooting/Problems 6 04-09-2012 04:16 AM
Interested in a ZJ 5.9L with Cyl #8 Misfire Need Help Chaoul1 Troubleshooting/Problems Discussion 17 09-17-2011 02:25 PM
CYL#4 misfire violant00 Troubleshooting/Problems 5 12-06-2010 12:10 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 10:28 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.