Posted by pete 23 on November 15, 2011 at 18:41:11 from (74.32.238.142):
In Reply to: Re: 966 hard to start posted by tbone8 on November 15, 2011 at 17:58:10:
The orfice is in the elbow that screw into back side of pump. There are a couple different styles. I used to be able to just look at them and tell if it was orfice or not but last one I took off to check looked just like the old original but it was the orfice type. Being pump was just repaired it is no doubt sealed so no doubt you are somewhat restricted as to what you can check without warranty problems. There is a increased fueling piston inside that could be sticking and causing problem. Another fly in the ointment so to speak is that once you crank for a while, oil pressure moves that increased fueling device to normal run position so you get less fuel delivery and that can add to the starting problem. However, old saying goes, hard start cold engine is engine problem, hard start warmed up engine is pump problem. Valve recession, head gasket thickness, piston height over block, bowl in piston displacement all can lower comp ratios. Even wrong valve settings and there are two different setting on intake valve depending on what camshaft you have. Gets complicated. Oh, cranking speed , critical.
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