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Old 07-01-2013, 05:47 PM   #1
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Slight knocking when cold start? (Oil filter??)

My TJ has recently started a slight knocking sound when I crank it, it is quick, and doesn't last maybe 10/15 seconds and goes away. I can rev it up, and it doesn't knock, it's only when it's a cold start, or if it has been sitting for a little bit (say like I run in walmart for a while or something). A buddy of mine said his truck did that, and it was his oil filter? I don't have a place to change the oil myself, or the time usually so I let a Firestone place here on the base change it for me (I know... I know...) last time I didn't have a problem, this time I noticed it. Could this be it, or anyone have any suggestions? Any recommendations on a filter if that is what's causing it?

Thanks!

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Old 07-31-2013, 11:15 PM   #2
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Bump.
I have the same issue once in a while.

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Old 08-01-2013, 12:00 AM   #3
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Just changed my oil myself and installed a mopar filter with mobil 1 synthetic and now ive got the same issue... hope you guys find out what it is.
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Old 08-01-2013, 12:11 AM   #4
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Normally caused from a thick oil thats cold. Which delays oil getting to the main bearings. Just make sure you are using the recommend oil this is a normal occurrence when your engine gets up there in miles. As long as it doesn't keep knocking after the oil pressure comes up. If you watch the oil pressure the knock probably goes away when the pressure comes up.

On a second note oil filters can fail. The worst is fram. Generally when this happens when you rev up the engine the oil pressure goes down.
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Old 08-01-2013, 12:22 AM   #5
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Yeah sounds about right.. but is it best to sit at idle and wait or go ahead and go?
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Old 08-01-2013, 12:34 AM   #6
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Originally Posted by Ljcrawler05 View Post
Yeah sounds about right.. but is it best to sit at idle and wait or go ahead and go?
That depends on who you ask, Me I just start and go unless there is ice on the windshield then I let it thaw out.
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Old 08-01-2013, 12:42 AM   #7
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Originally Posted by R u s s View Post

That depends on who you ask, Me I just start and go unless there is ice on the windshield then I let it thaw out.
Well as far as "cold" starts go... it is 70 degrees here and I am having the issue. It is when I let it sit over night or while im at work rather than freezing or lower temps.
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Old 08-01-2013, 12:58 AM   #8
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Originally Posted by Ljcrawler05 View Post

Well as far as "cold" starts go... it is 70 degrees here and I am having the issue. It is when I let it sit over night or while im at work rather than freezing or lower temps.
Still applies the main thing is all the oil runs back into the pan after sitting and it takes a few seconds for it to get pumped though the engine. Less worn engines dont have that noise because the clearances are still tight. But as an engine gets more worn they get looser which then requires oil to keep them from clattering That is assuming you have more than a 100000 on the clock. So in short nothing to worry about
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Old 08-01-2013, 01:21 AM   #9
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Originally Posted by R u s s View Post

Still applies the main thing is all the oil runs back into the pan after sitting and it takes a few seconds for it to get pumped though the engine. Less worn engines dont have that noise because the clearances are still tight. But as an engine gets more worn they get looser which then requires oil to keep them from clattering That is assuming you have more than a 100000 on the clock. So in short nothing to worry about
Sitting at 83k on my lj rubi so yeah I suppose its getting on up there but still a couple years from hitting 100k although I know thats an arbitrary mark but still. Anyways it definitely coincides with the ops problem and does quickly vanish as the oil pressure reaches normal. If it gets worse ill worry but whats really got my attention the less noisy constant ticking I hear. It is a very fast paced ticking compared to this sound but is like I said much quieter. I hope its not my cam shaft gear like ive heard 05s had an issue with but I wont know til I break down and open her up or take her to the stealership.
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Old 08-01-2013, 01:32 AM   #10
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May the jeep fairy bless thy jeep and make the problem go away
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Old 08-01-2013, 01:45 AM   #11
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Haha hope so but just curious and it may possibly be off topic but do you have any history with seafoam? Never tried it and I am skeptical about putting liquid other than gasoljne into the engine.. Although I just saw some on youtube
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Old 08-01-2013, 01:55 AM   #12
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Ive used it but never any amazing results for me.

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