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High-pitched whine when cold, sometimes when warm V70-XC70 1998

posted by  kcookvt on  Thu Jun 6 11:30 CST 2013
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last visit: Tue Aug 5 19:59 CST 2014
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I hear a high-pitched whine in my 1998 V70 AWD w/ 158K miles when the engine is cold. It lasts about a minute (it does not get louder with acceleration), and then generally stops. Sometimes it will do it again at idle (stoplights, traffic, etc.). I am wondering if it might be the air pump--for some reason, I seem to remember having read something about air pumps causing high-pitched whines. If so, does it need replacement? What does the air pump actually do, anyway?

Thanks








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    High-pitched whine when cold, sometimes when warm V70-XC70 1998

    posted by  KlausC on  Thu Jun 6 11:55 CST 2013
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    last visit: Fri Oct 24 10:15 CST 2014
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    That is the Secondary Air injection System (SAS) pumping fresh air into the exhaust. It is only supposed to run when the engine is cold and then for about 2 minutes max. The pump is expensive, so is diagnostics at the dealer. The pump is under the battery tray.

    Most SAS systems fail due to a bad oneway valve on the line leading to the exhaust manifold.







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