Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hi Chuck, the cold starting is all about the fuel pressure. You need to know what your cold warm up regulator pressure is. If the pressure is too high you won't get enough cold enrichment. You need to turn the key on and off repeatedly to prime the system. Just leaving the key on will not do it as the pump only runs for 2 seconds each time you turn the key. I really think that this is a pressure problem as opposed to a fuel bleed down problem.