My 1992 300e 3.0L starts fine, runs very smoothly and well - it would run at road speed all day long. But once up to operating temperature, if I stop at a light or whatever, letting it idle, it stalls and won't start at all again until the engine has cooled off. Then it starts.

When it won't start, it has spark, so I don't think it's an ignition module. The fuel pump runs then shuts off when keyed, so I think the MAP relay is fine. I replaced the crankshaft position sensor - problem not solved. Changed out the 4 pin water temperature sensor that controls fuel and spark at the computer - problem not solved.

How to I check the engine for fault codes?? Is there a place I can plug in a code reader?

Any ideas?

Thanks!

Dave