Quote:
Originally Posted by kk2002s
The Secondary air pump(SAP) runs at cold start for about 1-1/2 - 2 minutes (Sounds like small vacuum)
If your high pitch sound is during that and goes away when pump stops, indications are bearings in SAP are dry (They can be re-greased)
Obviously if the sound is not associated with SAP then check previous posters suggested components
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I think I have the same issue, a kind of whistle for a few seconds at start-up...
Is it difficult to re-grease those bearings?
Thanks!