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Dear jkordzi,
Good a.m. I think you're onto something. The noise is almost certainly that of an electric motor.
Volvos have few of these: starter, radio antenna (some models), fuel pumps, power seat(s). The only one likely to be clearly audible in the engine bay - and over the noise of an operating engine - is the starter.
It must be possible for the starter to remain engaged with the flywheel, once the engine has caught. I presume this would impose great strain on the starter motor, leading to premature failure. Perhaps the starter solenoid is sticky, and disengages slowly (which might account for the sound fading). A sticky starter solenoid might also be consistent with this sound appearing after the car has been out in the cold, as cold tends to make lubricants congeal.
If the car, is put up on ramps (trans in park, emergency brake on, rear wheels chocked) and the engine turned on, one need only put a hand on the starter to be able to detect quickly if it is turning.
If it is still turning, once the engine is running, that is a problem and likely the problem.
Hope this helps.
All the Best for a Good, Healthy 2004: for you, your family, and your cars!
Yours,
spook
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