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when wanting to speed up, does it downshift properly

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when wanting to speed up, does it downshift properly

 
Old 05-21-2019, 08:34 AM
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Mercedes R320L CDI 4MATIC 2007
when wanting to speed up, does it downshift properly

My car has got 642 engine CDI, 2007, gerabos 7g tronic 722.9

When the car is moving, and i want to speed up, i start accelerating and it does not downshift properly, i have to kick it harder, a couple of times, then it downshifts.
Also, on cold start it cranks the engine for too long before the engine starts up. The fuel pressure builds up i guess. The fuel system does not maintain the residual pressure. Not sure where that prassure is failing to be maintained.
I tried to switch ignition on and leave it for 30 seconds, the pump at the tank prebuilds the pressure in that time. Then the cold start is ok, no long cranking before it starts up.

I have read some old thread in this forum, that problem with the downshift and long cranking are related. Possibly cause of the fuel pressure is not maintained properly?

Any advises are appreciated.
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