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Originally Posted by Gilly
M119 engine, has electronic throttle.
E420 has 722.6, no vacuum modulator.......
If the mixture was too rich it'd throw a code.........
Gilly
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Sorry Gilly.. should have clarified the statements. "In my personal experience" with vehicles other than a W210, the observations are accurate.
I disagree with the code comment though -- the controller compares readings across several drive cycles before triggering the CEL. Unless you read pending codes (and were certain the condition would persist), a rich condition during a test drive would be transparent. Except for raw fuel dripping out of the exhaust, of course ;-)
Moral of the story is, take the car out for another test drive before making up your mind. Unless the car has spotless maintenance records (and even then), be prepared for some expensive initial repairs. Just the nature of used Mercedes in my humble opinion.
-DM