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Join Date: Sep 2012
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Cold Start Exhaust Smoke

My 1960 356B, though seldom driven, has always performed flawlessly...no problems whatever. I am not a mechanic, so every Spring I have the car checked out by a local independent Porsche shop. Last Fall, the car started smoking on cold starts....no oil or gas leaks, no trouble starting, and once warm runs flawlessly, smoke free. While I don't exercise the car as often as I should, I've had the car for 5 years and the smoking is a recent development.
Thoughts? Suggestions?
Old 03-05-2018, 02:19 PM
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Join Date: Jan 2017
Location: Santa Cruz Ca
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Check the oil level with car on level ground. Maybe it was slightly overfilled.
Also perhaps some fuel from the carbs are washing the upper cylinders upon startup and then allowing a small amt of engine oil to burn until the rings reseal.
I have had light smoking on start up with blowby from breather pipe on motors
with SC/912 (solex p40ll) carbs and the stock oval airfilter on passenger side.
Lastly,the valve guide seals are leaking a bit of oil after the last running and causing smoke
at the next startup
Old 03-05-2018, 06:31 PM
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black or light gray smoke?
Black = fuel
light gray = oil
Old 03-06-2018, 08:36 AM
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Light grey smoke, so oil the culprit. Oil level fine, smoking started late last year, so overfilling not the problem. thanks for the tips....gives me a place to start.
Old 03-06-2018, 04:51 PM
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