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#1
06-13-2006, 08:34 PM
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What's in Your Carburetor?
I rescued my 280C after a catastrophic engine failure occurred while it was being driven across the Arizona desert in 2001. But that's another story.
Ever since I got it running, it has had cold start/warmup and idle problems. Finding a major intake gasket leak helped a lot, as did learning how to adjust the Solex 4A1 choke pull-down. In 2003, I replaced the Solex with a Holley 4360C as part of a used JAM kit, and that improved the idle but the warm-up problems remained. About a month a ago, things really went downhill. Progressively worse idle, harder start and miserable warm-up. Checked everything and concluded that it had to be the carb. Upon dismantling, I discovered a fine sediment in the bottom of the float chamber. Problem is, the main and secondary jets are also in the bottom, so what I suspect is that I started with a dirty carb, and it got progressively worse as the fuel flow was restricted more and more. So I threw all the pieces in a gallon can of carb cleaner to soak overnight, rinsed with water, and blew everything out with 40 psi of air. Reassembled and re-installed. Did not replace any parts or gaskets. Cranked a few times to fill the chamber, and it started and for the first time ever DID NOT DIE . It literally runs now like a new car. Smoother idle, more power, easier starts. So I guess the moral of the story for the 250/280 crowd is that it may be something as simple as a dirty carb.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe 
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#2
06-14-2006, 07:25 PM
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well that is how it is sometimes. i have done full or partial rebuilds on a good few carbs with good results.
then too i have rebuilt the same dam# carb four or five times with no success. god love fuel injection. as long as it is working correctly. tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#3
06-18-2006, 05:00 AM
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Quote:
Great story, Chuck. Regards
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1974 280C
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#4
06-18-2006, 06:31 AM
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and the fuel filter.
tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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