RBORT,

Got your PM and read your description carefully. It sounds like the fuel pressure might be bleeding down after you shut the car down. When you shut off a CIS car, the fuel pressure should drop slightly to keep the inj ectors from popping on hot days and flooding the engine. The system should stay pressurized, however. If I'm understanding your description, you are getting better results on a cold engine, because you may be getting helped by the cold start valve. If you have the equipment, I would suggest running a pressure, volume, and leak down test on the fuel system. The next possibility is a problem in the aftermarket computer that was installed to make the car compliant with U.S. EPA specs. I am assuming you have a frequency valve that kooks like an injector valve plumbed into the fuel system. Unplug the electrical connector and see if it makes a difference. That should put the system in open loop and make it run like a basic CIS system.

I just had another thought. that system should have a warm up compensator on it. You control pressure may be way off the chart. That is another reason I suggest a complete fuel system test by the book. Checking the fuel pressure with the gauge and 2 way control valve allows you th check both primary and control pressure through the complete warm up cycle.

Good luck,
Peter

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