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MNBoxster · 03-13-2006, 03:35 PM

Hi,

Good advice so far. To add to the list, it could be a Hydraulic Lifter gone south. A sustained high speed run such as you describe can be a prime breeding ground for this issue, especially on a 100k+ mi. engine.

But, as mentioned, this would produce an RPM variable noise. Hope this helps...

Happy Motoring!... Jim'99

03-13-2006, 03:35 PM	#10
MNBoxster Registered User Join Date: Sep 2005 Location: Minneapolis/St. Paul, Minnesota, USA Posts: 3,308	Hi, Good advice so far. To add to the list, it could be a Hydraulic Lifter gone south. A sustained high speed run such as you describe can be a prime breeding ground for this issue, especially on a 100k+ mi. engine. But, as mentioned, this would produce an RPM variable noise. Hope this helps... Happy Motoring!... Jim'99