My Mercedes ML 350 fails to start

Hello, thank you for the informative and precise articles. I recently acquired a used Mercedes Benz ML 350 (3,726 cc) from Japan.
However, I have observed that it will start and drive perfectly without a hitch but when it is parked and an attempt is made to restart, it will behave like a car that has run out of fuel.
After a period of being stationary, it will gain kick to a start faultlessly. At this point, the check engine light will come on but goes off after the subsequent starts.
Regards,
Tim.

Hello Tim,
The symptom you describe suggests that your Mercedes ML350 has a faulty crankshaft position sensor.

It would be useful to get a computer diagnosis to confirm my prognosis.

A Crankshaft Position sensor (CKP) is an electronic device used to monitor the position and rotational speed of the crankshaft in an internal combustion engine.

This information is used by the engine management system to control ignition system and fuel injection timing.

The CKP sensor also works in tandem with the camshaft position sensor to monitor the timing of the pistons and valves.

The CKP sensor is magnetic and uses this hall effect to read the toothed flywheel. During operation the CKP sensor is often exposed to a lot of heat which may damage it or accelerate its failure.

This will result in engine misfire, erratic idling, hesitation or refusal to start when hot.
Often the engine will start again when it cools down. I suggest you look up a reputable Mercedes parts dealer to buy this part