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Strange Noise At Start-Up

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Old Aug 15, 2006 | 11:46 PM
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Default Strange Noise At Start-Up

Hey all,

I've noticed, especially when the car is cold or been sitting for a while, what sounds like a vibration/rattling noise when I start the car. I hear it only when the car is standing still with the clutch depressed (of course) when the car is initially started. The noise is not present once the car settles into idle, or if I rev the engine in neutral/clutch depressed. Any ideas as to what could cause this noise? Something loose? My mods are in my signature.

Thanks,
Matt
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Old Aug 16, 2006 | 12:38 AM
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Originally Posted by Viprklr
Hey all,

I've noticed, especially when the car is cold or been sitting for a while, what sounds like a vibration/rattling noise when I start the car. I hear it only when the car is standing still with the clutch depressed (of course) when the car is initially started. The noise is not present once the car settles into idle, or if I rev the engine in neutral/clutch depressed. Any ideas as to what could cause this noise? Something loose? My mods are in my signature.

Thanks,
Matt
I have an automatic and I still hear this rattling sound. Sounds like piston slap or tappet noise and it goes away very quickly. My LS1 never made this much noise on start-up.
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Old Aug 16, 2006 | 12:48 AM
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Mine too. Sounds like bad valve clatter for about 2 seconds right after the engine starts. It happens only occcasionally. Trying not to worry about it...

Late 2005 MM6 with 8,800 miles here
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Old Aug 16, 2006 | 10:59 AM
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I hear it once it a while. I run ProLong (no flames) which seems to have quited it down.
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Old Aug 16, 2006 | 01:07 PM
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Hard to say if it is engine related, or something vibrating at start-up. Not sure.

Anyone else?


Matt
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Old Aug 16, 2006 | 02:47 PM
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Lifter noise on cold start up is very common in many auto's. My C6 does it and it's nothing to worry about.
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Old Aug 16, 2006 | 11:10 PM
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LS2 engine is notorious for noisy valve train. Ignore it if that is where the noise is coming from.
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