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Old 05-29-2002, 12:29 PM
Snow bum
Join Date: Jan 2001
Location: Here and there . . .
Posts: 238
280SEL dies on warm idle

My 280SEL is acting up. It drives without a problem, but it will stall when I slow to an idle. This only happens after I have been driving long enough to fully warm the engine. The engine slows down with the car and just keeps slowing until it shuts off instead of hitting idle.

This problem is only a nuisance to me, but I can see it being quite dangerous to the girl who normally drives the car. Therefore I hope to be able to fix it soon. Any help?

The MBs:
1976 300D (W115) - 330K and still going (sort of)
1991 300D 2.5 Turbo - Sold at 221K
1983 280SEL - Sold at 206K
1981 300SD - Sold at 232K
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Old 05-29-2002, 12:39 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The idle is adjustable on your car. Try adjusting the large screw at the front lower of intake out (counter-clockwise).

A problem that occurs on these engines is that they have a thermostatically closed additional air valve. As they fail they need to be fully hot to close off all the way. The device should close completely by 130-150deg F (not sure of exact range, but it should be closed well before engine thermostat temp). If the device is still partially open at the t-stat temp and the idle is set there then the idle is too low when it finishes closing.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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