Engine bay noise when key turned to 'On'

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Jun 12, 2005 | 01:07 AM

jono20

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From: Vernon, BC

Engine bay noise when key turned to 'On'

When I turn my key to the 'on' position I hear a small humm resonating from the engine bay. I tried to track it down but couldnt pin point it. IS it the fuel pump? or something else?

Jun 12, 2005 | 01:28 AM

NZConvertible

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From: Auckland, New Zealand

That'll be the BAC valve, which controls idle speed. It's an oscillating solenoid that varies airflow by varying duty cycle.

Jun 12, 2005 | 01:55 AM

jono20

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From: Vernon, BC

cool. as long as its nothin to worry about. thanks nz

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