986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Video - Help! Is this IMS? What's up with this engine?

dmairspotter · 05-05-2013, 05:18 AM

Hard to tell from your videos. and I am definitely no expert, but the random knocking sound seems like cam chain tension or a drive belt pulley bearing. From what I have read about IMSB, it would have grenaded by now if that was the problem.

05-05-2013, 05:18 AM	#13
dmairspotter Registered User Join Date: May 2011 Location: Maine, USA Posts: 126	Hard to tell from your videos. and I am definitely no expert, but the random knocking sound seems like cam chain tension or a drive belt pulley bearing. From what I have read about IMSB, it would have grenaded by now if that was the problem.