1973 280C Occasional Smokey Ride - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 08-15-2007, 10:07 PM Thread Starter
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1973 280C Occasional Smokey Ride

I purchased my 73 280C about six months ago and it was in pretty good condition. When I first purchased it I had no smoke problems whatsoever. I had some general tune-up work done to it, including a new fuel pump. After the new fuel pump was installed I began to have time-to-time exhaust smoke issues. The smoke usually only happens if 1) I idle the car for over two minutes and then when I accelerate it kicks off smoke or 2) if I drive at 50-55 mph for a bit and then stop when I go again it'll kick up a good amount of smoke. The color's a bit hard to characterize - I wouldn't say it' black but I wouldn't say it's white either. Greyish is the best description. That's how it generally kicks smoke although sometimes it seems to have a mind of it's own and it'll just throw some smoke on acceleration or after a routine quick stop sign. Also, the car is not eating excessive oil, although I do have an occassional leak on start-up if I rev the engine high. Do I need to readjust my carb b/c of the new fuel pump? Or are there other considerations? O/w the car runs and looks great - I would love to solve the embarrassing problem. Suggestions?

Last edited by VintageOwner; 08-15-2007 at 10:10 PM.
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post #2 of 3 (permalink) Old 08-16-2007, 09:27 AM
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Sounds like the diaphram for the break booster. It is rubber and gets hairline cracks, causing the engine vacum to suck in some brake fluid.
It was an easy fix.
I have a 73 280c and it ran fine just smoked from time to time as you explained.

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post #3 of 3 (permalink) Old 08-16-2007, 03:28 PM Thread Starter
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Thanks Bruce, I appreciate it - it's frustrating when the ride is great but for a little smoke -
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