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Engine sound at 3000 RPM

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Old Jul 1, 2002 | 10:09 PM
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2002 C230K, Silver, 6-speed, Evo, Roof, Leather, CD, Staggered C7 Wheels
Engine sound at 3000 RPM

Now that I have the windows open most of the time while driving I began noticing an unpleasant sound from the engine at around 3000 RPM.
It sounds like a metal gate flapping and beating on metal (like a valve of some sort )
Do you guys have any idea about this?

Last edited by VoyagerDude; Jul 2, 2002 at 02:07 AM.
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Old Jul 1, 2002 | 10:19 PM
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a guess

It's the valves hitting the pistons.

Just kidding.

I bet it's the supercharger beginning to spool up - those suckers are quite noisy above 3K rpm.
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Old Jul 1, 2002 | 11:01 PM
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i have no idea... i think you need to take a video...

i'll try to listen for it but it is so hot right now, i've been using the A/C.
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Old Jul 2, 2002 | 01:12 AM
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Hi Voyager, i have the same issue with my car. I don't think it is anything to worry about. Like Mike T said it is the supercharger spooling up. Some times it can get noisey under there.

But i noticed on my car it does it when the car is not warmed up yet, after it is warmed up (10-15 minutes of driving) the noise seem's to dissapear a little.
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Old Jul 2, 2002 | 02:04 AM
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Originally posted by young
i have no idea... i think you need to take a video...
Very funny, my camera doesn't exist anymore
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Old Jul 2, 2002 | 02:06 AM
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Thanks for the responses guys, I'll try listening after 10-15 minutes of driving.

HAPPY CANADA DAY !!!!!!!!!!!!!!!!!

:p :p
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Old Jul 2, 2002 | 03:23 AM
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Canada day

Originally posted by VoyagerDude
HAPPY CANADA DAY !!!!!!!!!!!!!!!!!
Yeah, eh!!

I just got back from a free Big Sugar Canada day (9-10 PM PST)concert in Victoria, followed by fireworks. A great show, my 3 kids loved it.
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Old Jul 2, 2002 | 10:58 AM
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Re: Canada day

Originally posted by Mike T.


Yeah, eh!!

I just got back from a free Big Sugar Canada day (9-10 PM PST)concert in Victoria, followed by fireworks. A great show, my 3 kids loved it.
We had 54-40 and Bif Naked here

This morning I listened to the engine after driving to work (about 15 minutes) and indeed the metallic sound wasn't there. The engine actually sounded nice.

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Old Jul 2, 2002 | 10:59 AM
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my coupe and my mom's coupe made the exact same sounds... we both thought it might be a problem with our cars until we realized each others' did it too

i'm not sure what makes that metallic sound exactly, but i've learned to love it. get it up to 5400 rpm and it really screams
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Old Jul 2, 2002 | 11:01 AM
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Re: Re: Canada day

Originally posted by VoyagerDude


We had 54-40 and Bif Naked here

This morning I listened to the engine after driving to work (about 15 minutes) and indeed the metallic sound wasn't there. The engine actually sounded nice.

There is a good chance that you were hearing the air pump that injects air into the exhaust when the cat is cold for smpg purposes. It only runs for a few minutes and make the sound you described.
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Old Jul 2, 2002 | 01:08 PM
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Re: Engine sound at 3000 RPM

Originally posted by VoyagerDude
Now that I have the windows open most of the time while driving I began noticing an unpleasant sound from the engine at around 3000 RPM.
It sounds like a metal gate flapping and beating on metal (like a valve of some sort )
Do you guys have any idea about this?
Is the noise only when in motion or is it present in neutral at 3000 rpm ?
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Old Jul 2, 2002 | 01:13 PM
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Re: Re: Engine sound at 3000 RPM

Originally posted by viper


Is the noise only when in motion or is it present in neutral at 3000 rpm ?
Hi viper

The noise is present in both neutral and in gear starting around 3000 RPM for the first ?-15 minutes.
After that it seems to go away in both neutral and in gear.
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Old Jul 2, 2002 | 01:25 PM
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Check the heat shield in the engine compartment. It may need to be bent a little since it is in contact with the exhaust manifold. When the engine is warmed up it expands enough so that it does not rattle against anything. Get someone to rev it up in neutral and you will see where it is coming from.
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Old Jul 2, 2002 | 02:15 PM
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Thanks viper,
Might be worth checking out.

I'll try to find this heat shield.
What is it made of? What side of the engine is it?
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Old Jul 3, 2002 | 01:12 PM
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Its on the left side of the engine. You can't miss it. It is a formed aluminum sheet that nicely wraps around the engine. Very easy to bend if thats the source of your rattle.
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