Sudden smoky, shaky idle - Page 4 - PeachParts Mercedes-Benz Forum

Monomer · #46 01-24-2007, 12:05 AM

pull you CCV hose off.

start the car. put a rag close by the hose's end. See any oil drops? Oil seperators in the CCV system sometimes fail...

atleast, I had this problem.

ConnClark · #47 01-24-2007, 11:14 AM

Its the turbo seals then. Clocking the compressor housing to a different angle should have no effect as it is not in contact with any of the moving parts. To check and be sure, check it off the car. Pull the turbo and block off the oil return passage. Then fill it with oil and apply air pressure to the feed hole.

bgkast · #48 01-24-2007, 03:22 PM

Quote:

Originally Posted by Monomer

pull you CCV hose off.

start the car. put a rag close by the hose's end. See any oil drops? Oil seperators in the CCV system sometimes fail...

atleast, I had this problem.

My crank case vent tubes are clear. Both the one off the valve cover and the one off the oil seperator are oil free.

Tymbrymi · #49 01-24-2007, 08:30 PM

Quote:

Originally Posted by bgkast

I think I have found the problem...and it is the same problem I thought I already fixed...the turbo oil seals. This is a picture of the new turbo's compressor outlet after 5 miles! (it was clean (relatively) when I installed it. The turbo inlet is clean as a whistle.

For others in the thread the attached pic is what it looked like pre-cleaning before it was put in bgkast's car... The car it came off of always had oil in the intake problems (IE, the air filter would get oil soaked, etc).

Could it just be oil that was built up inside the compressor housing? That car didn't use oil (well, certainly nowhere near 1qt/100 miles... ). It didn't smoke or anything silly like that either. I'm not saying the seals aren't bad on this turbo as well... but it sure would be one hell of a coincidence!

bgkast · #50 01-26-2007, 05:37 PM

I got an estimate of $300 today to have the turbo re-sealed. Do you recommend that I go for that or try another $100 turbo?

ConnClark · #51 01-26-2007, 06:52 PM

Go for a $50 rebuild kit and learn how to do it yourself. Thats what I'm going to do with my OM603 turbo I bought with bad seals

bgkast · #52 01-26-2007, 07:52 PM

I wish I could but I don't have the time, My new job eats it all and requires the use of my car.

bgkast · #53 01-28-2007, 01:35 PM

I took the old turbo and had the former Brandon34145 take a look at it, and I think he nailed the problem...the oil drain tube. When this whole issue started I had just added some oil possibly making the level too high and bringing the oil level up to past the bottom of the drain tube.

Brandon told me if there is any restriction in the drain tube the oil will tend to be pushed out of the seals. I drained some oil when I put the new turbo on, but in the process of installation I think I pushed the lower drain tube into the sump too far causing my oil leak between the two sections of the drain tube and my worse than ever smoke. I'll try some new drain seals and a new drain tube with my original turbo and hope for the best.

cscmc1 · #54 02-06-2007, 10:53 PM

bgkast -- did you ever resolve this problem? Thanks!

bgkast · #55 02-07-2007, 01:41 PM

Still waiting for parts.

bgkast · #56 02-13-2007, 01:06 AM

One last call for new ideas before I reseal the turbo.

Once again I have smoke at idle with lots of smoke at takeoff.
So far I have ruled out:

Oil separator due to no oil at inlet of turbo

Head gasket due to very little blow by (I pulled the valve cover vent hose with the car on and the blow by felt like a light breath on my hand)

I also ran the car and put a rag over the compressor outlet. A few drops were on the rag after revving.

The car was slightly over filled with oil when the problem started, however it has since been drained to just above the low line on the dip stick with no improvement. I have also checked to make sure that there no restriction in the turbo’s oil drain.

Any thing else I should try?

Thanks.

bgkast · #57 02-13-2007, 12:30 PM

I should also add that this problem has persisted through two turbos. The first showed only a bit of leakage into the compressor, and the second showed heavy leakage into the compressor.