986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - No start...timing good...leak test bad...need help

NewArt · 04-15-2015, 04:31 PM

As Byprodriver suggested, I don't think you have conducted your leakdown test according to Hoyle. Make sure you are at TDC on the compression stroke for each cylinder. Otherwise you may have a valve partially open resulting in false readings. Also, it is not accurate to do this test on a cold engine.
Ah, okay, I see that you have answered back while I was typing. Still the cold engine thing though. The rings won't make a good seal.

04-15-2015, 04:31 PM	#4
NewArt Artist, 986S tinkerer Join Date: Aug 2013 Location: Montreal, Canada Posts: 1,821	As Byprodriver suggested, I don't think you have conducted your leakdown test according to Hoyle. Make sure you are at TDC on the compression stroke for each cylinder. Otherwise you may have a valve partially open resulting in false readings. Also, it is not accurate to do this test on a cold engine. Ah, okay, I see that you have answered back while I was typing. Still the cold engine thing though. The rings won't make a good seal. __________________ James now has: 2008 987S 6 speed Crashed: 2010 987.2 pdk in speed yellow! Sold to a cool racer chick: 2004 986 S YouTube channel: the PORSCHE as seen by NewArt www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ? Last edited by NewArt; 04-15-2015 at 04:34 PM.