mercedes w115 black smoke - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 08-04-2013, 04:57 PM Thread Starter
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mercedes w115 black smoke

hello.. i have 1975 Mercedes w115 with petrol engine 2000 cc when the car is in idling there is a black smoke on the exhaust and the car consume a lot of fuel . i want the advice for this problem please.
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post #2 of 11 (permalink) Old 08-04-2013, 05:11 PM
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How many miles on the car?


Black smoke usually means your rings are gone, or severely gone valve guides.

Do a wet and dry compression test will tell you what you need to know.
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post #3 of 11 (permalink) Old 08-04-2013, 05:33 PM Thread Starter
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i am from Egypt and my car have 78000 miles
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post #4 of 11 (permalink) Old 08-04-2013, 05:37 PM Thread Starter
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i thought that black smoke causing due to an problem in a carburetor
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post #5 of 11 (permalink) Old 08-04-2013, 07:20 PM
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It might be that your carb is set to be too rich at idle. However, you would know this by smelling the exhaust at idle. If too rich, you'll smell unburnt petrol. If it's oil causing the smoke (bad valve guides or rings), the smell will be from a worn out engine.
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post #6 of 11 (permalink) Old 08-05-2013, 06:22 AM Thread Starter
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thank you for advice
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post #7 of 11 (permalink) Old 08-05-2013, 07:25 AM
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stromberg carb

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Originally Posted by mesh3el View Post
thank you for advice
primarily check carburettor needle valve could be worn out and overfilling the carb .this will result in black smoke sluggish running.
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post #8 of 11 (permalink) Old 08-05-2013, 10:32 AM
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In general...
Black smoke = Fuel mixture is too rich
Blue smoke = Engine is burning oil

There can be a multitude of reasons for each condition. You will have to check each during your diagnosis
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post #9 of 11 (permalink) Old 08-12-2013, 02:48 PM Thread Starter
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at first thank you KITAKA but i want to know how to set fuel mixture in the carburetor that there is a nut on the button of the carburetor is that responsible for air fuel ratio.
thanks
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post #10 of 11 (permalink) Old 08-12-2013, 05:14 PM
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the chocke valve could be stuck on , there is a small diaphragm at the fuel return valve , if it leaks , you will be sucking gas into intake [ vacuum line under carb .]
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