Hard start (esp. when Cold), low idle-- Idle Control Valve?

[Erwin8r]

Originally Posted by mbenzman

You don't adjust the mixture on that car with a "sniffer". So lets play with adjustments without a clue, throw parts at it at will, anyone with a suggestion is a better choice to follow than a qualified mercedes guy. Any guess will do to continue on wasting money and probably doing damage to the engine, cats, and god knows what else.
The mixture adjustment should have been tamper poof for this reason. Take the car to a Mercedes mechanic and have it adjusted before you have to spend real money.
Sorry for the real advice, but other than swapping a couple parts you should not have played with the mixture. If the mixture is adjusted improperly it will cause hard starting, especially cold starts.
You can check the fuse in the overvoltage relay located behind the battery beside the engine control and abs control units.
Good luck, but still have the mixture corrected.
Rich

Rich, you sound like you have a burr in your saddle... relax, and read my original post: the mixture screw was screwed with (pardon the pun) prior to my purchasing the car.... I've ALWAYS worked on my own cars whenever possible, and internet forums such as this have proven invaluable (learning to sort through the BS is another skillful art...). I am not afraid to learn somthing new, and am happy to have learned how to use the Duty Cycle feature of a multi meter...