Kristen

Car is currently at a shop, hopefully have an answer this afternoon.

Problem is:
- problem happened today, no previous signs of a problem
- idles fine
- drives "rough" at low RPM, sounds like an exhaust leak
- the "rough" sound gets worse at high RPM
- car has less power when "rough" sound occurs
- the "rough" sound appears to come from the front of the engine
- supercharger whine gets loud with increasing RPM, louder than ever before
- problem is intermittent, car drives fine for a bit, then rough, then fine, ... yet more rough than fine

This car has had the:
- oil in harness issue resolved
- leaking cam sensors issue resolved

SeaCoupe

So this is the M271 right? I have had my S/C rebuilt on the M111 at 97k miles. Really, it was for peace of mind. When I pulled it, the vanes looked great, and the bearings were top notch. But it gave me piece of mind.

What I'm thinking is actually your actuator. This is what opens up in the intake tract to get air to your S/C. Check this first. There is a reset procedure for the M111, there has to be one for your car.

Try that, and let us know.

Ed

SeaCoupe

Okay, I stepped back and was thinking about this. Were it the actuator, it would throw a code. Have you checked for codes? Do you have a CEL?

E

Kristen

There is a CEL, hopefully the garage checks the codes too.

Its is the M271.

There is a noticeable rough sound from the front of the engine, would the actuator cause this?

By actuator, you mean the throttle body?

C230 Sport Coup

These guys will rebuild your SC for $300, and they told me a 2 day turnaround.
http://www.magnumpowers.com/thunder_blwr_ser.php
"All M45, M62 and M90 Eaton Supercharger rebuilds are $300 plus shipping."

I have 123K on my blower and it still works.

You can look up all the parts and see diagrams by signing up for a free 1 year subscription to the MB EPC (elec parts cat, get it?)
https://epc.startekinfo.com/epc/coverage.jsp

Then you can order the parts from various dealers who sell parts online.
I now use Autobahn in Belmont, CA, but there are others in Florida.

Search on google for "trademotion" and "mercedes" to find the dealer that works best for you. Part prices are much less than if you went to the same dealer over the counter.

Good luck!

Nothing mechanical is hard, just can be strenuous.
Getting the SC off the 1st time is a PIA, but well worth the money saved.
On the M111 you end up pulling the top of the SC off in order to reach the rest of the bolts.
The intake hose is held in place by a clip that looks like a paper clip
(same as the tranny hoses at the rad)
and nothing more! Note the orientation of the clip when removing.
Will save you much trouble later, and if it pops off the car will have much less power, just need to reseat the hose.

If anyone knows of a shop that rebuilds SC's in Cali please post.

C230 Sport Coup

Ed, would you please pm me the reset procedure? Or point me to a post?
I've never been clear on this.

Kristen

That's awesome info, thanks! Signing up for the subscription right now.
Even if the SC is toast, it can be rebuilt?

I'm not worried about getting the SC out, just worried that its what is wrong and that its bad weather here right now (Canada), making it hard to work on. Hopefully the garage can diagnose, otherwise off to the dealer Mon and I'll be car-pooling.

Kristen

Miss-fire on cylinder 3, car going into limp mode.

Changing the coilpack and spark plug did not help.

Think this might be the $12 hose resurfacing? I did have problems getting it all tightened down.

Kristen

P2058
P2023
P2014
P201a
P2004

r0mantics0ul

I just replaced my supercharger yesterday. And from what you are telling on your post I think it is the supercharger. I will post all the part #'s that you will need when I get off work. My paper work is at home hope this will help you

Kristen

P2058 is the crank position sensor.

This could be an issue since its one of the sensors that get fouled with the "oil in harness" issue, and my O2 sensors were drenched with oil, no doubt this senor was too.

SeaCoupe

The more you put out, the less I think it is the S/C.

Go to Buellwinkles OBD code page and you can look up the rest.

E

aolsen

Did you get the "$12 hose" fixed? not sure if you know, but it's a national recall now, you can get it fixed for free at any Mercedes Dealership.

I had the $12 hose problem, car had a rough idle, lost power, poor acceleration, mechanic did the obd scan thing and said 2 cylinders were misfiring, maf, etc....

turned out it was only that hose, got if fixed 2 weeks ago, now the car's fine....

also check on your cam sensors...

Kristen

I did, these codes are not listed:

P2004
P2014
P2023

From Google it seems they might be related to emissions or cam sensors.
I'm going to start with the CPS sensor, since I've replaced both O2 sensors and the MAF when I had the damn "oil in harness" issue.

Kristen

I did fix it, yet at the same time discovered the "oil in harness" issue and realised the $12 hose wasn't causing my problems.

Its might be that hose, going to check it tomorrow to see if the bottom clamp is on tight, had a tough time installing it.

Kristen

Drove the car home in limp mode only to be greeted by a smell of burning oil and the "oil level low" warning message.

Popped the hood and found it smoking from under the intake box. Took off the intake box to see where its burning oil.

Checked the $12 hose - its fine.

The burning oil seems to be coming from or under the intake manifold. Its going into the dealer Mon to see what's wrong. Anything else I can check until then?

I'm going to clean the crank position sensor tomorrow and see if that helps since its one of the codes that was thrown. Also going to remove the cam sensors and see if there's any problems with them.

Kristen

Worse news, its smoking white smoke.

New head gasket most likely , shouldn't have driven it home.

rubensans

I will also be interested on this.

Thanks