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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21630
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Volkswagen Polo. Intermittent loss of power. Turn it off, wait

Customer Question

Volkswagen Polo. Intermittent loss of power. Turn it off, wait and start up again and the problem seems to cure itself. Just had a service and problem still there. Nothing showing when the garage plugged into the fault recorder.
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.

Hello


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 position sensor

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.

Check the resistance of the spark plug leads ( 13-15Kohm / metre) and replace if any doubt or high resistance - Also replace the spark plugs if any of them fail this checklist
Expert:  Matt replied 2 years ago.
Hi

do you still ned help with this?