Need help diagnosing a metallic clatter: Video included
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Need help diagnosing a metallic clatter: Video included
My car started making a horrible metallic rattle/clatter a couple days ago. I am at a loss. Any help diagnosing this would be greatly appreciated. Video is included below:
Here's the rundown:
1. Noise is loudest at start-up. Seems to quiet a bit once the engine is warm.
2. Rattle frequency increases as RPM increases, till about 3K RPM.
3. Rattle is most prominent on the passenger side of the car. Loudest underneath. Not sure if that's the exhaust amplifying the sound, or if the noise is actually coming from the transmission.
4. Pulled the passenger valve cover. Springs/rockers looked fine.
5. Pulled spark plugs on passenger side. All show normal wear.
6. Drained/changed oil. No metal noted in oil.
7. noise started abruptly when I was driving to work. Had to drive the car home (about 35 miles). Car drove fine, even at 90mph on the German Autobahn. Power felt normal. The AFR was 14.6 at cruise and 12.4 WOT, so it seems normal.
http://youtu.be/6GPkm7OFlj0
[URL="http://www.youtube.com/watch?v=C6RXNv-3-rI"[/URL]
I'm shipping the car from Germany to the US on Monday. Hoping it doesn't die en-route to the port or in-transit.
Help appreciated (and needed). Thanks.
Here's the rundown:
1. Noise is loudest at start-up. Seems to quiet a bit once the engine is warm.
2. Rattle frequency increases as RPM increases, till about 3K RPM.
3. Rattle is most prominent on the passenger side of the car. Loudest underneath. Not sure if that's the exhaust amplifying the sound, or if the noise is actually coming from the transmission.
4. Pulled the passenger valve cover. Springs/rockers looked fine.
5. Pulled spark plugs on passenger side. All show normal wear.
6. Drained/changed oil. No metal noted in oil.
7. noise started abruptly when I was driving to work. Had to drive the car home (about 35 miles). Car drove fine, even at 90mph on the German Autobahn. Power felt normal. The AFR was 14.6 at cruise and 12.4 WOT, so it seems normal.
http://youtu.be/6GPkm7OFlj0
[URL="http://www.youtube.com/watch?v=C6RXNv-3-rI"[/URL]
I'm shipping the car from Germany to the US on Monday. Hoping it doesn't die en-route to the port or in-transit.
Help appreciated (and needed). Thanks.
#2
Take your belts off, run it for a couple seconds and see if its a pully. It doesnt sound internal to me. Im semi noob but i like to diagnose. Make sure you take the AC belt off also because my 250k camaro needed both AC idler and tensioner pullies.
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A bit more info: When I did my cam swap 25K miles ago, the front cam bearing was worn with a small groove in it. Could a failed front cam bearing cause this noise? I'd expect it to resonate EVERYWHERE if it was that bearing. Again, this noise is concentrated on the passenger side of the car.
Additional $0.02 needed and appreciated. Thanks in advance.
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This is a total head-scratcher of a problem for me
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#10
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The fact that you say there is no metal in the oil is a good sign. A bad bearing will definitely show metallic color in the oil. I wonder if you have a cracked flywheel. It doesn't sound like a lifter to me, although hearing the car in person is much different than a video.
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For lt1pwr1, installed a new LS7 clutch/flywheel 3k miles ago. Could be a possible cause.... Thought I'd be surprised if it died after such a short time.
If nothing else, glad to know this noise is stumping more peeps than just myself.....
More $0.02 appreciated.
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Thanks for all the replies and suggestions.
Still haven't figured out WTF is causing this very loud tick/rattle. Dropped the car off at the port for shipping yesterday, so will tear it down once it gets back stateside next month.
BTW, I had to drive 28 miles from home to the shipping location. Car still drove smooth. I did note that the rattle/sound decreased significantly at 2200RPMs exactly (no good reason why that is...), and was loudest at start-up or when under a load (accelerating, going up hill).
Hoping it's something stupid like an exhaust leak, but I've never heard a nasty rattle like this from exhaust. Mentally prepping myself for the worst.
Will update in May when I get my car back.
Still haven't figured out WTF is causing this very loud tick/rattle. Dropped the car off at the port for shipping yesterday, so will tear it down once it gets back stateside next month.
BTW, I had to drive 28 miles from home to the shipping location. Car still drove smooth. I did note that the rattle/sound decreased significantly at 2200RPMs exactly (no good reason why that is...), and was loudest at start-up or when under a load (accelerating, going up hill).
Hoping it's something stupid like an exhaust leak, but I've never heard a nasty rattle like this from exhaust. Mentally prepping myself for the worst.
Will update in May when I get my car back.
#16
Couldn't load the video..but I had a ticking in my 2000 5.3 that sounded just like you were describing. I was worried it was a lifter. Well I looked at it at idle this morning and saw a spark plug wire shaking. A couple of the plugs were loose so I tightened them and no more ticking. Just a thought
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Couldn't load the video..but I had a ticking in my 2000 5.3 that sounded just like you were describing. I was worried it was a lifter. Well I looked at it at idle this morning and saw a spark plug wire shaking. A couple of the plugs were loose so I tightened them and no more ticking. Just a thought