Odd Engine Noise part 2, with video!

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Al Pizzica

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Hey all, thanks for the help in the other thread I started.
Short version: 2013 LR4 99k miles, odd engine noise when cold. LR dealer was worthless, said rod bearing, which it's not. Oil is clean. Runs great, no loss of power. Independent LR place took apart the front and said its not the timing chain (but I should probably do it in near future), wanted to tear into it further and do the chain for $8K USD AND didn't guarantee that would solve this noise. Hit the pause button.

I'm really at a loss for what this is. I've had 15 Jeeps so I thought I knew every possible engine noise. It almost seems to come from the intake manifold? Only other noise it remotely sounds like is a Jeep 4.0 with a hairline exhaust manifold crack. Is there any chance its a sticky valve letting exhaust back into the manifold?
Thanks all, have a listen, noise came out well in these. You can really hear it at the end of the first video and throughout the second (sorry for vertical, not worth fixing)


 

Quijote

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I am no expert at engine noises, but if I hear it correctly, it seems to idle fine. The noise comes as the throttle is increased and then released. Hard to tell from the audio if it is internal or external.

Is this LR4 new to you? If so, how long have you had it and what is the service history?
 
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Interesting they are telling you to do the timing chain...I thought the faulty tensioner issue was fixed by 2013?

It does have the tell-tale rattle though (just at idle).

Interesting thing about the sound is how closely related to engine speed it is. Sort of makes me think it’s internal to the motor. But it is odd...never heard that before.
 

Al Pizzica

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I am no expert at engine noises, but if I hear it correctly, it seems to idle fine. The noise comes as the throttle is increased and then released. Hard to tell from the audio if it is internal or external.

Is this LR4 new to you? If so, how long have you had it and what is the service history?

We got it CPO in 2016. All dealer services.
Correct, don't hear it at idle. Only when accelerating and it goes away when it gets warm.
 

scott schmerge

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We got it CPO in 2016. All dealer services.
Correct, don't hear it at idle. Only when accelerating and it goes away when it gets warm.

I’ve heard fan clutch going bad usually goes away when warm. Definitely does not sound like timing chain rattle to me.

you certain it’s not fan?
 

Jimmy Brooks

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It’s definitely not the timing chain don’t let them charge you for that it wouldn’t make sense especially coming from the back of the engine
 

TheKOI

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My Jaguar XF SC suffered the timing chain guide failure. From what I could hear in both videos, I don't think that's the problem in your engine.
 

Al Pizzica

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Thanks, all.
Fairly confident it's not the fan. They had it off when they did the diagnostic, so they probably would have heard something. I'll run it again and listen specific to the fan. Maybe I'll get a stethoscope off amazon.
 

rands100

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I had a discovery 1 V8 that had a noise a bit like that. I thought it was a liner slipped.
Turned out the cats had broken up. The noise was going in time with engine speed.
 

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