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Engine Knock
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=38276		 Page 1 of 1
Author:  ChiroKJ [ Tue Dec 16, 2008 9:40 am ]
Post subject:  Engine Knock
So over the last few weeks my engine developed a loud knock. I tried searching for previous stuff but it all seems to be cold engine knocking. My on the other hand only happens when the engine warms up. I happens randomly at low RPM but i can sometimes reproduce it when i let off the gas. Happens when i idle it as well. its a 3.7L with 60 000 miles

any ideas?
Author:  TAHOE [ Tue Dec 16, 2008 1:09 pm ]
Post subject: 
What year is it? Could be some carbon building up on pistons/valves etc. I do remember reading when we first got ours about a lot of people with 05's having burnt valve issues. Worse case could also be oil getting thinner when warm and rod knocks developing when pressure drops at lower rpms.
Author:  ChiroKJ [ Tue Dec 16, 2008 4:33 pm ]
Post subject: 
its an 02 and i use mobil one 0w-40
Author:  Jeepjeepster [ Tue Dec 16, 2008 6:56 pm ]
Post subject: 
Maybe you should try using a weight oil that is recommended for the 3.7 and go from there? 0w is a bit thin and 40 is a little too thick.

5w-20 would be the most I would ever go. Personally I use 5w-30 in the winter and 10w-30 in the summer.
Author:  LIV42DY [ Tue Dec 16, 2008 9:22 pm ]
Post subject: 
Drop some Mobil 1 syn 10-30, my 02 was raised on it 67000 miles with no issues. I run it all year round no matter hoe cold it gets. Try it it may get rid of the knock.
Author:  ChiroKJ [ Sat Jan 24, 2009 3:53 pm ]
Post subject: 
had the mogil one 5w 30 for a while and the knock is still there especially at idle. it almost sounds like a spring sound with a distinct metal knock...... :(
Author:  afornal [ Sat Jan 24, 2009 10:29 pm ]
Post subject: 
Sounds kinda Similar to mine. See my Post Under general Discussions #2 Cylinder Misfire. Mine did this after we had an Extreme drop in temprature. Just started her up on a 10 below morning and bam, I got the tinging noise, with a diag code telling me #2 Cycliner is misfiring. Changed all the Plugs, and a NEW Coil Pack for that Clyinder - Same thing, so she was flat bedded off to My Mechanic last tuesday for deeper analysis. I have not heard anything as of yet, but will be posting updates on the problem under my post when i get the final diagnosis and the Bill $$$$$$$$$$$ :(
Good Luck
Author:  ChiroKJ [ Sun Jan 25, 2009 2:20 am ]
Post subject: 
i changed the plugs a few days ago and no help either :x
Author:  tjkj2002 [ Sun Jan 25, 2009 11:18 am ]
Post subject: 
ChiroKJ wrote:
i changed the plugs a few days ago and no help either :x
You need to pull the valve covers and you will find your problem.
Author:  afornal [ Mon Jan 26, 2009 8:44 pm ]
Post subject:  Engine Knoock
Just heard back today from my local mechanic - My Problem was the rocker arm came loose - They fixed that - perfomed an Oil Change and she be back on the road tomorrow! - Price $100 fix. I'm happy!!!!!!! :D
Author:  trailman [ Mon Jan 26, 2009 9:21 pm ]
Post subject: 
100 bucks! Nice!
Author:  cfreelv711 [ Tue Jan 27, 2009 11:02 pm ]
Post subject: 
8) Hmmmm...rocker arm..under valve cover?? Any doubt tjkj know his stuff?? Stealership would charge $78 just to tell what the problem is and tjkj does it or free :lol:
Author:  ChiroKJ [ Tue Mar 31, 2009 6:14 pm ]
Post subject: 
The knock kind of went away ( well it was not constant in the first place) it would only do it once or twice during a 5 mile trip. the weirdest thing is that i got out of the car today and heard it again AFTER the engine was turned OFF... :shock:
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