If there is no preheating then you are coking your injectors at the very least. Ruining your lift pump and your IP are also in the works.

How much money are you really saving if you have to put in new injectors and a new IP?

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42