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Matt
Matt, Mechanical Engineer
Category: Vauxhall
Satisfied Customers: 21988
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a vauxhall movano, intermittently whilst driving it

Customer Question

i have a vauxhall movano, intermittently whilst driving it will cut out, loose all electrical power, but will restart if you change down a gear and bump start whilst still moving
Submitted: 11 months ago.
Category: Vauxhall
Expert:  Matt replied 11 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 meter

Crank position sensor

Cam position sensor

O2 sensor

Throttle pedal 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.

Customer: replied 11 months ago.
thank you for your response, i can understand there may be a poor connection that causes the engine to cut out but like i said all electrical power is lost, for example when it happens all the electrical components stop working, if the wipers are going then they will just stop in the middle of the screen, the radio will go off etc
Expert:  Matt replied 11 months ago.

Ok

thanks for the clarification

in that case I'd start by checking the condition of the main battery connections and the earth connections between the chassis and the engine and the chassis and the battery

also check the condition of the high power ( 40A) fuses in the engine bay fusebox for cracks and corrosion