Let me try and solve one problem at a time here: My car - once it starts - runs fine, EXCEPT for really poor gas mileage. Doesn't matter if I'm on the highway, or city driving - I'm getting around 14 mpg.

Now, I'm having a cold and warm start problem. In the morning, when I go to start the car it will crank fine, start right up and then stall out. If I crank it again, it will usually stay running this time - after the idle drops to approx 300 rpm's and then kicks up to 500+ rpm. All of this is WITHOUT stepping on the gas pedal.

If the car is warm, it will start right up on cranking, but will NOT stay running unless I give it some gas. Hot/warm starts have been a problem for a while - the cold start problem is new. My understanding is the cold start valve does not operate until temps are below 50F (??), so I don't think this is the problem. I am assuming all of this is contributing to my poor mileage - which of course, could be wrong.

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE