1989 300E 200,000 miles, usually very hard start in morning (10 min pumping the gas pedal) but during the day starts right up. New plugs, wires, battery,fuel pump relay. Could it be crank shaft sensor?

Accumulator, cold start valve, fuel pump check valve.

Try a Search, lots of posts on this problem and how to chase it.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe

CTAYLOR738- Thanks for the direction. I spent the day reviewing old threads and replacing the ignition coil seems to resolve the problem. I replaced it yesterday and had no problems starting this cold am.