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1985 380SL
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Discussion Starter #1
I bought this car in "not running" condition. Got a smokin' deal! We have changed the fuel distributor, fuel injectors, & oxygen sensor. We have done a complete tune up. We even purged the old fuel. (apparently the car sat for quite a while). The oil actually smelled like fuel.
Anyway, when we start the car it seems fine. After it warms up, it starts to smoke. It is white smoke and only seems to happen off a light or after slowing down for a turn. The vacuum lines seemed to be out of wack, so we tried to straighten those out too.
Also, seems to have build up on one plug. It seems to be getting to much fuel.
We are also looking for a complete service manual that shows schematics for wiring and vacuum. (not a cd, a paper book). Would appreciate any input and advice. Thank you.
 

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Coolant leak?

White smoke is usually an indication that there is coolant leaking inside the block and mixing with the oil.

Does the white smoke come out immediately after you start? If not, how long before the white smoke comes out.

And this is white smoke, right? Not white water vapor from the exhaust?
 

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1985 380SL
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3 Posts
Discussion Starter #3
Re: Coolant leak?

White smoke is usually an indication that there is coolant leaking inside the block and mixing with the oil.

Does the white smoke come out immediately after you start? If not, how long before the white smoke comes out.

And this is white smoke, right? Not white water vapor from the exhaust?
The smoke only comes out when I "gun it", like off a light or trying to pick up speed. It is white smoke, not water vapor. We also have black soot on the spark plugs.
Thank you so much for taking the time to respond!
Pat
 

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BenzWorld W126 & W201 Host
1988 420SE, 2002 C180 Kompressor, 200 ML320
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White smoke

pattywack

I know you say it is definately white smoke, but the symptoms you describe suggest that the valve stem oil seals need replacing (the worst one being the plug with the build up on it)
Cars that have been stood along time or which only do short journeys, can suffer from water build up in the silencers caused by condensation. this produces steam when ever the engine/exhaust gets hot.
The best way to determine whether it is steam or burning oil, will be to give the car a run and get the engine nice and hot.
then leave the engine idling for about 5 minutes.
Stand at the rear of the car whilst somebody gives the engine one big rev.
You should be able to tell from the smell whether it is oil burning or not, plus if its steam it will dispear quickly where as oil burning smoke will hang around.
If it does turn out to be steam, and your coolant level has not been dropping, then it is nothing to worry about and is water in the exhaust.
If its oil, then it will probably be the valve stem seals.
[?]
Also, the black soot on the plugs mean either the fuel/air mixture is too rich or that you do too many short journeys and the engine is not getting warm enough for the cold start system to cut out.
 
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