My 450sl starts fine and will run for about 5 minutes until it gets warmed up. At that point it starts to run so lean that is stalls. I have tested the fuel pressure 73psi (both warm and cold) and it is within specs. I did a fuel volume test both when it was cold and warm
- ok. The pump and filter were replaced about 2, 000 miles ago.
I tested the control pressure from the warm up regulator to the fuel distributor. Cold the pressure was 22 psi, warm 50 psi. Both within the spec.
When I warm the car up and it will not run, if I hold the mass air flow senser down a little enriching the mixture the car will run.
I have not tested the lambda control, but not sure that if it was failing could lean the car out so much it would not run.