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Strange clicking noise poss from Turbo

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Old Jun 8th, 2019, 21:32   #1
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Default Strange clicking noise poss from Turbo

My diesel 2008 XC70 (170k miles) has started making an intermittent clicking/whirring noise. It has been described as sounding like a lightweight hedge trimmer.
It lasts a few seconds and happens, eg. when I unlock the car, when I open a door, in fact it seems to be triggered by any form of electrical change.
My local mechanic (not Volvo but I have found him to be sensible and reliable) thinks it is coming from the turbo 'actuator'. Some part not engaging properly.

I do get the occasional symptoms of a misfire and lack of power but very intermittent. I did get an 'engine system service urgent' warning but it went away the day when I next I used the car.

A turbo problem makes sense and the mechanic hopes to be able to replace the actuator as the hardware seems in good order.

Does his diagnosis make sense? If so, can the actuator be replaced without the main unit?

I don't really want to take it to my local Volvo dealer as they charge a *lot* more than the local guy (and he's in walking distance)
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Old Jun 9th, 2019, 12:56   #2
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I would have thought that no engine components would be activated purely by un locking the car.... If the key is not in the ignition and switched to position 2(?) surely the only things made live would be things like folding mirrors, electric seats and the entertainment systems. Could the noise be a relay that's failing? They click and clatter when they are on the way out.. Could well sound like a noise from the engine bay area.
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Old Jun 9th, 2019, 17:25   #3
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Default relay noise

my xc70 2011 makes a fair "thunk"noise from relay a few seconds after being locked-my old v50 did the same[2008 car]

possibly the same relay noisy when activated???
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Old Jun 9th, 2019, 19:43   #4
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Have you had the codes read?
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Old Jun 10th, 2019, 13:44   #5
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Thanks for the replies. The noise definitely comes from the engine compartment - it's the driver's side of the engine. I can't see exactly as there's too much in the way. When the car's unlocked or a door is opened, the dash instruments are activated, so it's not too much of a leap to assume that other things get turned on as well.

My guy said the codes referred to a turbo "overboost"
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turbo, xc70

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