wheel.will

Hey guys, I’ve had my 02 C320 for about 5 months. The last two months i’ve been trying to chase down the cause of my long cranking issue. I’ve done extensive research on the forums and still have came up with no solution. It should also be noted I have zero codes.

The issue: The car always starts when it is cold, whether that’s sitting overnight or sitting for two weeks. The car also always starts if it i start it within an hour of sitting from running. However, the car cranks very long and takes a while to start when it has been sitting for around 3 to 7 hours.

Things I have replaced because I thought they were the issue, which have changed nothing:
- Fuel filter
- MAF sensor
- Crankshaft Position Sensor
- Fuel sending unit
- Fuel pump

Any pointers would be greatly appreciated, thanks!