akbro93704

Sorry to bring up an old thread....but I took my car to the dealer, they had it for 2 days, and they say they felt "nothing unusual". Anyone with any updates? Aggressive---I know you had an update thread that the problem came back again after all the repairs....although your issue seems a bit worse than mine.

johff

That's right: Any news on the repairs? It seems like everyone has either given up on this issue or they have the problems fixed on their cars.

I took my car back AGAIN just this week. They gave me a C 230 as a loaner. I live in Canada, btw. The C 230 engine was way way smother than my C 300 4 MATIC. The C 230 engine idles like the car was wasn't running at all that is so quiet and I can hardly feel or even hear the engine. When the car was running, the engine was so smooth and quiet at any engine speed and road speed. Unlike my C 300 4 MATIC. The technician said it is normal for the 3.0L engine to ildes loud and sounds gritty I am still not convinced!!

Glyn M Ruck

That's nonesense. Please go and test drive a new C300 off the showroom floor.

akbro93704

I was going to make more of a fuss about it, but they had my car until yesterday, and I need my car Monday when school starts. When I have time I'm going to compare mine to another 300.

But thats ridiculous. The 3.0 liter shouldn't feel ANY different than the 2.5 or 3.5 V6.

Glyn M Ruck

Absolutely - & smoother than any 4 banger

johff

I agree! The 3.0 liter shouldn't feel ANY different than the 2.5 or 3.5 liter V6. The 2.5 liter V6 engine in the C 230 loaner that they gave me was so smooth and quiet that I thought I was driving an entirely car of DIFFERENT make than a Mercedes. I will go and test drive another C 300 4 MATIC in the showroom, if they have one.

I hope it's not a typical drivetrain noise from the front AWD driveshafts, propeller shaft, bearings, etc.

Anyone has their problems fixed yet? Please let us know if you have your problems fixed. Thanks!

Aggressive

FYI: The problem I was having is back now. The C300 has been at the dealer for a week and 3 days now. They have not called me once. In a short time, I will have accumulated 30 calendar days that my C has been at the dealer and I will enter into Lemon Law Arbitration.

C300Sport

Sorry to hear about the ongoing issue. Let us now how well MB treats you!!

Aggressive

Apparently I need to strike this comment as invalid. They installed new motor mounts, a new intake plenum, and some switch. I drove the car for 14 miles.....the check engine light came on. I brought the C300 back to the dealer. They replaced the left and right air pump switches. Check engine light has not come on since I got the car back. Well 3 days after having the car the gritty, gruffy problem started again. Now it has been at the dealer for a week and 3 days, they have not called me once. Not sure whats going on.

Glyn M Ruck

Good - I will be fascinated to understand what the problem is.

Aggressive

My service advisor called me at 6pm and said that they replaced a transmission mount. I honestly think that they are taking mutiple shots in the dark and have not idea what they are shooting at. They are not acting like troubleshooters. They are just replacing parts here and there. The bad thing is that I highly doubt it will fix the problem. It does not seem like it could be a mount, the car is not some old junker where the mounts would just wear out. When I drive the car it feels like the problem is mechanical. I am getting so fed up.

So, now the next step is for them to drive the car to see if it fixed the issue. If there is the slightest problem when I get the car back I will be dropping it with them again and initiating the Arbitration process for the Lemon Law.

johff

Hi:

I am just wondering for those who have the engine "rumbling" or "gritty" noises have the problems fixed?

Thanks!

Aggressive

I have has my car back for about a week now. I have not had any problems so far. The last repair they did was to replace a rear engine/transmission mount that they say was causing reverberation. I was skeptical but it seems to have been solved.

Glyn M Ruck

Excellent news. I drove a C280 (your C300) of a friends & it was smooth as silk.

akbro93704

Great!! Man, I really wish I knew if we had the same problem or not. Your problem seems a lot worse. My engine is smooth at idle, but once I press the gas, the engine feels rough at low RPMs, but smooths out at about 2200 rpm. I also can feel the "grittiness" when coasting at speed through the gas pedal. Your problem was intermittent, mine is all the time, and worse when the engines cold.

I will have to take my car in again

johff

THANKS! I am taking my car in tomorrow...aiiii. Hope this will give them an idea where the problems come from. Yes, my problem is all the time and it is worse when the engine is cold. It sounds and feels like a truck...very un-Mercedes like...

akbro93704

Cool...let us know what ends up happening

german-anger

My car used to shake while idling... turns out it was a loose engine mount...

johff

I got the car back today...they said they didn't find any issues with the rough idling and the "rumbling" noise from the engine when the car is running at it highest geat at 1500 rpm.

BUT when I took the car back and start driving the car, I felt immediate differences. The car now feels a lot smoother and quieter when the car is running at it highest gear at 1500rrpm...NO MORE rumbling noise. Also, the transmission shifts so smooth now that I could even barely feels it. Most importantly, the engine idles a lot smoother...very little "feedback" to the steering wheel.

I suspected that there was a software update for the engine management system?? They updated it but they did NOT want to disclose to me for whatever reasons and just told me that NO issues were found??

In addition, they updated the software for the BLUETOOTH as i complained that the other sides couldn't hear me due to too much feedback. The problem seems to be fix as I made a few phone calls today and nobody complained that they can't hear me anymore.

Johf
2008 C 300 4 MATIC Luxury

Carsy

Congratulations. You must be relieved. I don't understand why the service dept can't come clean with you about what they did. I would contact the service manager or the principal & insist on some feedback. They owe it to you for your trouble. It would be interesting to forum members also!!

akbro93704

Interesting...it would be REALLY good to know what they did though!

Glyn M Ruck

I'm delighted for you. I would phone the Service Manager & demand to know what they did. They obviously did something which they will have charged MBUSA for. It might not even have been a software update. It might just be getting the software loaded correctly. There have been endless 7G tronic software updates but I'm not aware of any engine software updates for the W204. That engine has been around a while & is pretty sorted.

johff

THANKS!! Yes, I am delighted too that the engine idles and runs a lot smoother and quieter. It is still not as quiet and smooth as the 2.5L engine. I was told that all three engines (2.5L, 3.0L, 3.5L) have different "noise" characteristic. The 2.5L engine idles and runs the smoothest and quietest, in comparison to the 3.0L and 3.5L engines. The 3.0L engine is the "noisiest", as I was told

Anyway, I am very happy now that the issue is resolved. Yes, I suspect that they may just simply got the software loaded correctly for both the engine and the transmission. Anyway, no more complains from me, as there are no more issues with the car. This is a very good car indeed and I enjoy driving it every seconds when I am behind the wheel.

By the way, I live in Vancouver, CANADA.

Johf
2008 C 300 4 MATIC Luxury

C300Sport

Glad to hear you are, once again, a happy MB owner, but hate to hear the 3.0 is the noisiest of the bunch!

Glyn M Ruck

Wonderful Canada - I'm biased. My late Dad was Canadian. I'm not going to accept MBUSA or the dealers comment on the 3 litre. My 2.6 V6 18 valve engine is beautifully smooth & these engines have a balance shaft. The larger capacity engines obviously have greater reciprocating mass so one would expect the 3.5 to be the worst of the bunch. I'm going to chat to my service manager who has a long history with Benz & is a fanatic on top of his job for comment. I would not accept the 3 litre claims as gospel.