1200rpm rattle......... - Mercedes Benz SLK Forum

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#1 Old 10-27-2017
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1200rpm rattle.........

Hi, first post on this forum!

I have a 2003 SLK230 Kompressor. Whenever it touches 1200rpm either revving up or when the revs come down there is a fairly loud rattle from somewhere in the engine/gearbox.....this happens when driving and also when in P or N. Anyone else experienced this issue?
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#2 Old 10-27-2017
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As it is happening in all gears are you absolutely sure that it is not due to the exhaust?
The system travels underneath the entire length of the car and will echo.
You get the rattle in all gears at the same revs.
Before getting into expense make sure it is not the exhaust.

Another favourite is if any work has been done prior to the rattle,
have any tools been left in the engine bay.

One more quickie for you.
Check the kit stored with the spare tyre. Loose kit often resonates into the cabin.
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#3 Old 10-27-2017
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In my case on my SLK320 the rattling between 1200 and 1500rpm was down to the front catalytic converters so sounded like it was coming from near the engine. Changed them and now silent.

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#4 Old 10-27-2017
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Quote:
Originally Posted by Turdo2 View Post

Sounds like the supercharger. it kicks in around 1200 RPM.

are you sure it's a "rattle"? can we get a video of the noise?
From your welcome thread.

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#5 Old 10-27-2017
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Quote:
Originally Posted by Avel Du View Post
From your welcome thread.
yes. whoever gave that tip is really smart!

You could unplug the supercharger at the connector in front of the engine and see if the noise stops.
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#6 Old 10-27-2017
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Same here, but mine was a lose heat shield above the secondary cats. Clattered only at idle or just off idle.
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#7 Old 10-27-2017
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I had one somewhat similar due to a broken exhaust hangar - it was hard to see the break, and because none of the other hangars was broken you couldn't really see it moving.
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#8 Old 10-27-2017
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Quote:
Originally Posted by efair View Post
I had one somewhat similar due to a broken exhaust hangar - it was hard to see the break, and because none of the other hangars was broken you couldn't really see it moving.
Same with mine! Ł40 for a bit or welding - sorted!
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#9 Old 10-28-2017
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I had an exhaust bracket break free on Silkie which was giving a rattle at idle - or just above idle. 30 minutes on the ramp and a spot of welding and no more rattle.

Which reminds me. I need to get some exhaust paint to cover up the bare metal used to earth the welder.
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#10 Old 11-28-2017
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Update...............garage disconnected cam magnet and rattle disappeared.....meaning it's the cam adjusters at fault. Expensive job, so may just leave it as it has got no worse over the past 3 years.....
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#11 Old 11-28-2017
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Quote:
Originally Posted by Polo Pete View Post
Update...............garage disconnected cam magnet and rattle disappeared.....meaning it's the cam adjusters at fault. Expensive job, so may just leave it as it has got no worse over the past 3 years.....
it's not too expensive if you have a few tools and a "new" part. I've taken mine out, but It wasn't to replace - so I'm not sure on the part prices.
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#12 Old 11-28-2017
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Pelican parts has a good tech writeup with pics for DIY cam sensor replacement. There are also threads here where people have replaced theirs.
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#13 Old 12-01-2017
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Quote:
Originally Posted by Turdo2 View Post
it's not too expensive if you have a few tools and a "new" part. I've taken mine out, but It wasn't to replace - so I'm not sure on the part prices.
The cam sensor is cheap, the cam adjusters however are Ł-hundreds!
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