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w114 - 1973 280 idles rough

1K views 7 replies 5 participants last post by  patrykrebisz 
#1 ·
Just bought beautifully maintained 1973 Merc (280). It drives beautifully but idles rough (to the point that it sometimes stalls while stopped on red light). Is the issue with carburetor or should i be looking somewhere else?

BTW. I'm new here!
 
#3 ·
As the point rider wears down, timing will retard a bit and can get to the point where the points don't open at low engine speed, just riding along the distributor cam. The symptom you describe is exactly what I would expect to see. It higher RPMs the points open.

So... Check to assure you have a points gap. If adjusting the points, you need to set the timing afterwards too.
 
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