1976 Mercedes 280 with Carburetor Trouble - Mercedes-Benz Forum

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post #1 of 26 (permalink) Old 02-04-2015, 05:48 PM Thread Starter
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1976 Mercedes 280 with Carburetor Trouble

Hello! I'm new to this forum and don't know a lot about cars. I have a beloved Mercedes 280. It is my first car. After four years of running well, it broke down. The mechanic told me it has carburetor trouble that is common to these cars and I need to have it converted to a Holley or other carburetor for 1,500 usd. He charged me $500 for the initial repair that did not help (car ran for two weeks) so I would like a second opinion from you guys. Is this a reasonable fee for the repair? What questions should I ask? I'm a student and it is hard to spend this money on my car but… I just can't stand to see this beautiful car go to the junk yard!

Please advise! Thank you!
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post #2 of 26 (permalink) Old 02-04-2015, 06:27 PM
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Yes you have he very last carburated car Mercedes every built and it is not good. My very first MB car was a 1973 280 sedan with the Solex carb. I recomend the after market carb kit. You will spend $$$$ trying to make the Solex work well. It can be done but requires much tuning and it's still not perfect.
Will
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post #3 of 26 (permalink) Old 02-04-2015, 06:28 PM Thread Starter
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Thank you Will! Did you use the Holley kid?
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post #4 of 26 (permalink) Old 02-04-2015, 07:17 PM
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what exactly is the car doing , you may have a easy fix , just be precise on your answer .
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post #5 of 26 (permalink) Old 02-04-2015, 07:23 PM Thread Starter
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The car usually starts ok but after running for a bit dies. It is scary to be driving down the street and then the car just shuts off. After this happens a few times I struggle to restart it. The mechanic says the carb is warped on top. Thank you!
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post #6 of 26 (permalink) Old 02-04-2015, 08:43 PM
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that is a common problem , lousy carb , worst quality seen . 2 issues , the float needle SEAT is pressed fit into housing it comes loose and will shut the fuel off .[the fix is easy if that is the case .also the carb fuel bowl is vented to a charcoal canister when engine is off , when the system malfunction , you end up with a vacuum on top of the fuel in the bowl , this cause the engine to die when accelerating from a stop .the fix is to close the vacuum operated vent valve by taking it apart and reversing the spring position to keep it closed .you want the bowl to vent inside air filter and not in the canister .have not seen a 280 in a couple of decades .also the catalyst on the exhaust manifold was a problem .the only good 280 was the 73 , the early first year was the best due to it s lack of bad smog equipment . when you open the second stage by hand , the 2 needles must lift , if they dont , the plastic cam on the shaft is gone [ common ] .if you can swap with another brand of carb , i would .
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post #7 of 26 (permalink) Old 02-05-2015, 04:30 AM
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Quote:
Originally Posted by Baybear View Post
Yes you have he very last carburated car Mercedes every built
No, he doesn't. There were (among others) 126 and 124 models available with carbs, just not in the US.

Felicita e un bicchiere di vino con un panino.
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post #8 of 26 (permalink) Old 02-05-2015, 07:05 AM
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Originally Posted by mercedes280fan View Post
Thank you Will! Did you use the Holley kid?
The Holley from Carburetor Conversions Sacramento CA | Jam Engineering
Will
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post #9 of 26 (permalink) Old 02-05-2015, 07:18 AM Thread Starter
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Thank you!

Thanks so much for your detailed response! Very helpful!
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post #10 of 26 (permalink) Old 02-05-2015, 05:22 PM
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Originally Posted by flyboyike View Post
No, he doesn't. There were (among others) 126 and 124 models available with carbs, just not in the US.
So what carb were they equipped with? Just wondering? Please educate me as I did not know carbs were used on later cars.
Will

Last edited by Baybear; 02-05-2015 at 05:30 PM.
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