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Matt
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 20615
Experience:  BEng hons Mech engineering, in auto industry 22 years
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2007 Mercedes ML63 AMG has sudden loss of power on the motorway.

Customer Question

2007 Mercedes ML63 AMG has sudden loss of power on the motorway. Switching off, and restarting again after a couple of minutes resets it, but happens again and again.
Submitted: 7 months ago.
Category: Mercedes
Expert:  Matt replied 7 months ago.
Hello This sounds like an electrical actuator or sensor at fault .Usually when you can cycle the ignition key on / off and then restart the engine and the fault is gone temporarily this indicates that this is an electrical component causing this issue. This could be a wiring issue as things tend to expand when hot and its possible a poor or partial electrical connection is being pushed apart on one of the major sensors so check the connection plug and wiring to the following;Airflow meterCrank position sensorCam position sensorO2 sensorThrottle position sensor unplug each in turn and use some switch / contact cleaner spray on the pins to ensure its all grease / dirt free Also worth checking the connections to the fuel pump for the same reason - unplug each in turn and give them a good squirt of switch / contact cleaner - Not WD40 and also unplug and inspect the main power relays and fuses for signs of overheating or corroded terminals - so the ones for the ECU and the fuel pump And also unplug the wiring loom connections in the engine bay one at time and inspect for corroded or recessed pins.

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