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Unread 07-04-2014, 08:09 AM   #1
SuperDave94
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Drive train noise...bearings?

Sorry to add another noise question to this forum, but I've been searching for months for similar threads. I have a 2011 JK with 6spd and 80k miles. It does have the TOB noise in neutral. What I'm concerned about is that when I'm driving and the engine is under a load (uphill) the engine makes a noise that I can only describe as a mid to high pitch clank...clank....clank....noise. Not too loud, but definitely noticeable by me. I'm concerned it may be a crankshaft bearing noise.

It makes a similar noise at a faster rate if I take off slowly in first without giving it enough gas. It's like the noise the engine will make right before it dies. It will usually do this at about 2000 to 2500 rpm. The Jeep did have a cold air intake on it when I got it and when I took it off to clean it I found evidence of dirt in the intake and the return breather hose. I'm concerned that I may need to do something to prevent ruining the engine.

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Unread 07-04-2014, 04:44 PM   #2
RockyClymer
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Is the noise slow enough to be related to a drive shaft joint? Axle U joint? I would look at simple things first. Hakam's Razor...
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Unread 07-06-2014, 05:29 PM   #3
SuperDave94
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I suppose it's possible. I can't rule it out, but it sounds like it's coming from the engine and sounds more like an engine noise.
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Unread 07-06-2014, 06:42 PM   #4
ncb
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Sounds like detonation. My 2009 pings if I don't run premium gas.
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Unread 07-06-2014, 07:20 PM   #5
Jiblet
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Quote:
Originally Posted by ncb
Sounds like detonation. My 2009 pings if I don't run premium gas.
Have you checked out your knock sensor?
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Unread 07-06-2014, 08:07 PM   #6
ncb
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Quote:
Originally Posted by Jiblet
Have you checked out your knock sensor?
Not yet. Planning to replace because it's fairly inexpensive.
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Unread 08-19-2014, 04:45 PM   #7
SuperDave94
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Not slow enough for that and it's more of an erratic sound. I would guess maybe it's because of the gearing and tires? Also suspicious that it's clutch related or because of the CAI....I would like to fix it to prevent later damage, but I don't think a mechanic with a better trained ear will be able to reproduce it. I'll surely be changing a clutch soon so if that doesn't solve it I'll move forward with diagnosing this as an engine noise. Unless something else comes to light.
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Unread 08-19-2014, 10:38 PM   #8
duneslider
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its not just a heat shield broken loose is it? Its common for the welded on heat shields to break a weld and make noise.

Have you tried running premium gas? If it is detonation that should clear it up and point in the right direction.
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Unread 08-20-2014, 08:05 PM   #9
SuperDave94
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Is this a heat shield on the exhaust? On the header or further down the exhaust system? I have run mid grade and seems to stay the same. I'll try premium this week.
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Unread 10-05-2014, 08:34 PM   #10
SuperDave94
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Heat shields look okay. I guess I'm bound to find out eventually. Sure is hard to listen to though. Sounds expensive....I've got some lights on my dash now though so .......priorities.
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