M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

crank; no start, leave key on & crank = start

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Old 06-23-2015, 03:31 PM
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ml320
crank; no start, leave key on & crank = start

2002 ml320 120k


Normally I turn key and let go; now she just cranks for a few secs and no start.
If I leave the key on (run position) for 5-7 secs, then go to 'start' position, usually starts every time

CEL showed CPS; changed it (bosch)

still throw code, and is slow to start.

I'm thinking filter/FPR ?


Does not 'die' at highway speeds; so no starvation?

Fuel pump?


Sun spot activity?
Bueller?
Old 06-24-2015, 02:31 AM
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2002 ML 320 & 2006 ML500
Yes fuel pump and or fuel filter.
Old 11-03-2018, 08:50 PM
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2023 AMG EQE 53
That's more good info, if it cranks then it's not the break switch. Sin're using the key to turn the ignition it's not the key failing to communicate with the car. I would say since if you leave the ignition "on" for a short while and the try again and it starts it is the fuel pump, regulator or filter. When the ignition is "on" for that little while fuel pressure is building up andathen when you try it again the car starts. If you are under warranty it's time to try your dealer and let them fix it. The can check fuel pressure and components.
Old 11-04-2018, 12:29 PM
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2001 ML 320
Originally Posted by ecoast
2002 ml320 120k


Normally I turn key and let go; now she just cranks for a few secs and no start.
If I leave the key on (run position) for 5-7 secs, then go to 'start' position, usually starts every time

CEL showed CPS; changed it (bosch)

still throw code, and is slow to start.

I'm thinking filter/FPR ?


Does not 'die' at highway speeds; so no starvation?

Fuel pump?


Sun spot activity?
Bueller?

had the same issue a few months back and it was my fuel filter

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