I concur with Jorge. My 300TE would be a bear to start until I adjusted the air fuel mixture about 1/2 turn ccw. Before I did that, I had to turn the switch on/off 6 times or so (without cranking) to get the cold start to shoot a bit of fuel to the engine each time, then it would start easily but run rough until it warmed up. Now, with the adjustment, it is running perfectly.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles