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Old 08-10-2006, 04:32 AM
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Join Date: Jun 2006
Posts: 6
Smoke from breather hose normal?

My 300CE puffs out some smoke from the engine breather hose. Also some oil deposits inside the air filter cover. Is this normal for a M103 motor? I get an occasional misfire and one wet-oily (engine oil) spark plug is usually the cause of the problem.

One MB service technicians say it needs new piston rings. The other says a valve job would suffice. A Compression Test was performed and within Mercedes specifications.

I have changed the following in the past 6 months:

Ignition Sender Unit
Ignition Coil
Ignition Distributor
Ignition Distributor Cap
Vibration Absorber / Balancer
Fuel Pump Accumulator
Fuel Pumps x 2
Fuel Filter
Fuel Injector Nozzle / Seals
Fuel System Valve

I have not replaced the Ignition Cables. Could this be possibly the cause?

Otherwise, the car runs very smoothly, no oil/smoke from the exhaust. What gives?

Last edited by avalanche; 08-10-2006 at 05:00 AM. Reason: addition
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Old 08-10-2006, 06:30 AM
Registered User
Join Date: Dec 2005
Location: Lakeville, MN
Posts: 25
I have an M103 in my 300se with a similar puff of smoke from the breather hose. Not saying it's suppposed to happen but with engines as worn as these it is inevitable. I assume that's why the vent hose was installed. If your compression checks ok then it's likely not a big problem.

I also have a similar rough idle problem. I think eveyone deals with it. I've checked all of the electrical components in the CIS-E system and all seem to test out fine. At one point I pulled the connector off the cold start injector thinking it was the culpret. No change. Yesterday I actually removed the fuel line to it and capped it at the fuel dristributer. Big change. Still slight roughness but a significant improvement. Sitting at a stop light you almost can't tell it's running. My assumption is that the cold start injector is leaking under pressure. I'll replace it before the cold weather sets in.
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Old 08-10-2006, 06:35 AM
Registered User
Join Date: Aug 2002
Location: Southeastern PA
Posts: 3,052
Sounds like your engine needs new valve stem seals.

Fred Hoelzle
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