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Old 06-19-2014, 12:55 AM   #1
Mike Grevera
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Default Engine knock/rattle

My engine recently began knocking/rattling at lower RMPs (
), anyone have any idea what is going on? I recently replaced the intake manifold, but I have no idea why it is doing this. Thanks in advance.
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Old 06-19-2014, 08:51 AM   #2
88 orangepeel notch
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I'd like to say it's something simple, but from that video, it almost sounds like bad crank bearings. I hope I'm wrong, as it is hard to say without being there.

How's your oil pressure at an idle with a warm motor?

Last edited by 88 orangepeel notch; 06-19-2014 at 08:55 AM.
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Old 07-14-2014, 03:09 PM   #3
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Get a mechanic's stethoscope to pinpoint the noise.

Any trouble codes?

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Old 07-15-2014, 03:19 AM   #4
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that actually sounds like the typical 4.6l timing chain rattle when the guides start to get worn.

You could also have a sticking lash adjuster , or even a bad cam follower.

Last edited by dawson1112; 07-15-2014 at 03:34 AM.
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