oil pump
What is the time period for an oil pump to be change out on the c230?
Does this needs to be change? What other parts are recommend do o this work since it might end up with take some parts out to get to it?
Estimate cost?
I went and try to pin point the problem. It sounds like its on top of the engine driver side.
All the belts and pulley sounds okay and looks new.
I can really hear this noise when I am in the drivers seat. Really loud and its right under my feet. There is a slight vibration when this noise resonate.
It gets pretty loud on the low rpm and seems to change in loudness as I add gas while driving and you can tell as it downhill as when slowing down.
Anyone with this experience on the v6 engine? I have a 2006 model. I did a smog check and it has pass with no issue, tech says they don't know what it is and is sure its not from the exhaust system.
Pleas help, I hope its not related to the transmission.
As mention earlier, a tech said its the oil pump and I know we mention this car does not have oil pump issue.
Any ideas guys / gals?

Can you explain or post the noise.
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I think that is probably what it is.
It's has a little whinning noise and seems to going directly when the engine is engage. Add gas or when it downshift while slowing down.
Noise occurs at lower rpm and seems to fade at higher rpm. It also quiets down when the car warms up.
The noise seems to be on the driver side area of the engine and can be also right on top of the engine.
I can really hear this in the driver seat. The shift stick vibrates a little when the noise is there. It sounds like it at the bottom of my feet where the pedals are.
I also hear a hiss noise in the back of the car while I was trying to pin point the area underneath. It hisses intermitently and seems to be in the rear wheel area.
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Here is the video of what I tried capturing of the noise I am talking about.
It goes.. whooooooooooooooo
Engine:
http://www.youtube.com/watch?v=7RxE8iwURa8
Interior:
http://www.youtube.com/watch?v=kRbmbg_Lymo
The interior whooo noise while I gas it is what i also hear when I drive when adding gas or when it downshift while slowing down.
any ideas?
I think Glyn is on the right track, that is may be transmission input shaft bearings. It sure sounds like bearing whine to me.

About the revved part. I had it, i was in the driver pit revving. It's not as loud as if you sat there, which is werid. Perhaps my mic has a noise canceler. haha

Yea, I revved it and you can hear the noise when I revved it. That noise is 10x louder when you are sitting there.
The sound clip of the revved part is on the second clip noted interior.
Last edited by 04mbc230; Oct 6, 2011 at 06:02 PM.

I really hope I'm wrong but having heard a few before that is what they sound like.
Has this transmission had it's 39K mile services?
Good luck! It's fortunately not the most expensive repair you can do on these transmissions. Cost of US labour is what will kill you if it is what I suspect.
So what type of work is this consist of. I doubt the previous owner did any flushing of the transmission. It's at 77k miles.
So does the whole engine has to be dropped to get to this part?
How much do you think it will set me back for the repair?
I am going to do a full tune up since I got owned this for the 2nd day.

Sorry for being a noob, what does TC stands for? Transmission cooler?? Transmission converter?? Please forgive me for being a noob.
I really hope I'm wrong but having heard a few before that is what they sound like.
Has this transmission had it's 39K mile services?
Good luck! It's fortunately not the most expensive repair you can do on these transmissions. Cost of US labour is what will kill you if it is what I suspect.

The transmission has to be removed - not the engine. In South Africa you would be in for about $2500. In the USA I really don't know.
There goes my pocket, a hole is formed.
Is there any other thing I should work at while doing this? Full flush? or is that part of it since I have to remove the transmission.
Any other parts to consider working on?
Thanks!! Glyn for the input.

Just wondering, how does this issue start? I mean, this is 2nd to last year for this model before than changed it, so how and why does this issue even become such a big issue. Can it be a manufacture defect? Or is it a failed to do maintenance?
Just want to understand to prevent this from happening again.
Is the older V4 enginee have this issue and should have oil flush? Or is this more from something else?


Sound familiar?
http://www.youtube.com/watch?v=_1ecpmF2cM0
Last edited by Glyn M Ruck; Oct 6, 2011 at 07:27 PM.
Yes.. that is the noise!!!! Awwww... cr*p!!!

So the owner end up fixing it.. Is that one of the forum members, if so, who?
Just want to see how much it end up costing him/her.
Sound familiar?
http://www.youtube.com/watch?v=_1ecpmF2cM0
Just one more reason to avoid the 7G. You're right about it being the second to last year model for the W203, but it was still early for the 7G transmission. It's no secret what I think of that thing.
The 722.6 may be old fashioned in comparison but it is not often you hear about big expensive failures on them, even after 100+ thousand miles of no maintenance.
Glyn will disagree, but I'd have told you to avoid the 7G had I saw a thread where you were considering swapping your 04 to an 06.

I had to replaced the front pump, seal, torque converter, filter, fluid, and have the bell housing machined.
Luckily I used to work at a trans place that sold parts so total cost for everything including labor was $1570
As per all your suggested failed parts and it's 100% on the dot. It's the Torque converter, Pump, seals, bearing that has failed. See attached pictures.
I was told that the seal was stuck in the pump and end up having the whole thing needed to be replace. The Torque Converter is all mared up and need to be replace.
Hopefully, this can be filed as a noise where others come across can use as the diagnoise and a possible fix.


