[pmead]

Thanks for the help guys! The car is US spec the WUR is correct "090". It takes 4 minutes for the warm control to max out at 3.5 bar. The residual pressure dropped to 1.8 BAR after 10 minutes with the valve open.(I may not have been clear about that) The problem happens when temp drops below 70f. 1.8bar is on the low side @20c. Does the low 1.8 pressure @20c indicate a rich or lean condition? I thought low pressure indicated a rich condition. The car behaves like it is lean during this time. (after 2nd start or 2 minutes all is well) I want to make sure my fuel pressures are not causing the issue before I start looking at other components. I am thinking about trying to richen the mixture just a bit before my next cold start. In fact I am going to try that now, and report back. My engine rebuilder does not have a CO meter and adjusted the mixture by "feel".