986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Camshaft deviation out of spec

thom4782 · 07-04-2015, 10:03 AM

My understanding is this

Camshaft deviation readings are valid only when the engine is fully warmed up. They change as the engine warms up and can mislead you
If one or both deviations are out of spec, you probably have worn variocam pads. If they wear too much, the engine can jump timing
The camshaft deviations should remain steady at idle. If not, it may be the IMS starting to wobble
When the variocam solenoid is the problem, you'll see this in the camshaft angles when the engine RPMs are in the 3000 range. The numbers will be significantly different.

Hope this helps

BTW: Just replaced my variocam pads and they were worn. My deviations were negative and got more negative over the past two years

07-04-2015, 10:03 AM	#6
thom4782 Registered User Join Date: Sep 2010 Location: Foster City CA Posts: 1,099	My understanding is this Camshaft deviation readings are valid only when the engine is fully warmed up. They change as the engine warms up and can mislead you If one or both deviations are out of spec, you probably have worn variocam pads. If they wear too much, the engine can jump timing The camshaft deviations should remain steady at idle. If not, it may be the IMS starting to wobble When the variocam solenoid is the problem, you'll see this in the camshaft angles when the engine RPMs are in the 3000 range. The numbers will be significantly different. Hope this helps BTW: Just replaced my variocam pads and they were worn. My deviations were negative and got more negative over the past two years Last edited by thom4782; 07-04-2015 at 10:05 AM.