KOMPCOUPE03

Just wondering if this a normal condition for these '03 1.8 motors or if I might have a problem.

The engine sounds terrible at idle- like a cheap GM 4 cylinder with lifter rattle.

Overall I love the coupe and it runs strong- it's just a little disappointing in this caliber of a car.

Also I have been away from this forum for a while- has there been any news on the intermittant hesitation on hard acceleration?

Thanks for any info!

tifosiv122

I assume you have an auto...I think its the tranny not the engine...smooth 'luxury' shifting. Not 100% sure though.

Erik

dmatre

The sound is probably the supercharger, rather than the engine rattling.

I can hear mine 'rattle' at the drive-thru window, if my window is open. From inside the car, you can't hear the rattle. For this reason, I don't believe it's the engine (which you would probably hear at all times - even in the car).

W0n6_3d4n

Maybe it's engine ticking u reffering to., don't woory, older model c class is worst

KOMPCOUPE03

"I can hear mine 'rattle' at the drive-thru window, if my window is open. From inside the car, you can't hear the rattle. For this reason, I don't believe it's the engine (which you would probably hear at all times - even in the car)."
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Right- I dont hear the noise inside the car- just outside and next to buildings- drive-thrus and such.

Engine or SC it's not good either way.

I will be going in for the first scheduled maintanence soon and I will see what they say.

dmatre

Yes, certainly it doesn't have a 'refined' sound to it, but I don't believe that it is a reliability issue.

Keep in mind that the supercharger is simply a belt-driven air compressor. If you've ever worked around compressors, you know that they make noise when operating, and I don't know how you could resolve that (other than isolating it in a sound-insulated box of some type).

This may be part of the reason that MB seems to be getting away from superchargers in their product line-up.

lars

It's the supercharger. Mine does it too.

GTIDAN

The engine sounds terrible at idle- like a cheap GM 4 cylinder with lifter rattle.
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The noise you hear is the blowoff value open during warmup. It lets the converter get up to temperature to cut down on emissions. Nothing to worry about. It's just one of the quirks of owning this type of car. My 2002 does it really bad on startup but quits within a minute or so and the idle smooths out. Once you know what it is I kind of enjoy the sound!!!

Keep in mind the supercharger is only working when needed; the rest of the time it's just spinning along. Enjoy your car and stop worrying about nothing.

TNblkc230wz

German engines are generally noisy at idle. Yes, my 3.2 isn't very quite idling either. However, I sure sounds smooth at red-line.

Torey3

My 04.5 230k sounds horrible at idle. Sounds like it is missing and the muffler is under water. It doesnt sound normal or a product of the supercharger.

LiquidSmile

Othe members have had this problem, STFF for Purge Valve. One had MB replace the Mounting clip on the purge valve abd it fixed the problem.

https://mbworld.org/forums/showthrea...ighlight=valve