Since the day that 6585 arrived we've gotten very poor gas mileage. Somewhere in the range of 12-14 mpg. While she passed emissions with flying colors (HC 14 PPM @ 775+ RPM), whenever the engine cold starts, it sprays out wet black particles all over out of the tailpipes. The oxygen sensor looks to be brand new, but the exhaust always smells rich. My question is how to I check the pulse ratio of the frequency valve? Before I run out and buy a new LAMBDA ECU, I'd rather check to make sure that the problem isn't a grounded microswitch, or something else causing a constant overide of the oxygen sensor. I tapped into the Diagnostic Plug, but I can't detect any readings from the ECU wire. Granted though all I have is a cheap multimeter from Wal Mart, so I may not be able to detect lower voltage with it. The other problem that we're having is a hot start problem. Cold, the car starts with little or no hesitation. But once it has warmed up, turned off, and then sits for at least 40 minutes or so, it takes at least 5-8 steady cranks to start her. When we purchased the car, we were told that the accumulator was new, and looking at it, it does appear that way. Last night it took the air box off, and observed the following: After running the car and then shutting it off, the air flow sensor plate had the normal amount of resistance behind it. But after about 20 or so minutes, you could push the plate down about 1/4 to 1/3 of the way down before you felt any resistance. Obviously it sounds like my fuel system can't hold it's pressure, but the question is where. Is there any way to determine if the problem is the Primary Pressure Regulator, a check valve (if so, which one?), or something else? The fuel pump is new, but is it's check valve inside, or can I replace the valve & not the entire pump (if that's the case)? I know that this is alot for just one posting, but I really would appriciate any and all ideas that everyone might have. Thanks in advance! -Robert VIN 6585