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  #1  
Old 02-18-2004, 12:02 PM
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Join Date: May 2002
Posts: 27
560SEL cold start hard

I have been bothered with this problem for some time now and have recently done more checking in an effort to understand it more -- all very interesting but to no avail so far. I am experiencing very long cranking time and long rough start up idle (couple minutes depending on temp) which isnt the normal smooth 560SEL motor.

Steve B's link on the Bosch system was a godsend and I have checked only the mixture control off pin 3 of the X11 connector which seems to behave normally --
-at open loop (key on engine off) very rich setting.
-once started the duty cycle moves around about 10percent indicating closed loop operation and I am able to adjust the mixture using the mixture control tower screw for the air flap.
-the mixture was a bit rich if anyting and I adjusted it to a more lean condition.

Does anyone know whether these settings affect start in a cold condition???

Many thanks.

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  #2  
Old 02-18-2004, 04:35 PM
goldstone's Avatar
W126 Lover
 
Join Date: Oct 2002
Location: Dutchess County, New York
Posts: 156
Just some random ideas that may not have occurred to you:

1) Not enough gas in mix: possibly fuel filter due for a change;

2) Too much air in mix: possible vacuum leak--test lines and connectors;

3) Have you tried a thinner oil (i.e. 5W-40)? It's been a rough winter!
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Eric

1991 560SEL-Euro (185,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)
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Old 02-18-2004, 04:40 PM
goldstone's Avatar
W126 Lover
 
Join Date: Oct 2002
Location: Dutchess County, New York
Posts: 156
One more basic idea: A large bottle of Techron (chicken soup for your fuel lines and injectors!)

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Eric

1991 560SEL-Euro (185,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)
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