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Old 08-07-2001, 01:28 PM
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1969 280SL problem

What might be the cause of a lumpiness / bucking when driving slowly in first or second gear? These are the symptoms:

-slightly lumpy acceleration from 1000 to 2000 RPMs
-bucks when maintaining speed 1000 to 2000 RPM on a slight incline (1st/2nd gear)
-downshift "burbles" from 2000 to 1000 RPM
-idle no problem
-higher RPMs are fine
-throttle linkages are adjusted properly

Does this sound like an ignition problem? Fuel injection? Fuel pump? Vacuum advance?

Thanks in advance for your help,

1969 280SL 4 speed

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Old 08-07-2001, 11:09 PM
Aaron's Avatar
Join Date: Aug 1999
Location: Cincinnati, Ohio
Posts: 1,935
Have you looked at your points and checked the dwell angle?
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Old 08-08-2001, 03:03 AM
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Points and dwell are OK, but the fuel pump has been noisy for some time (screech). Could that be the cause? The 280SL is fuel injected.


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