This vehicle has a long vehicle history trying to correct the rich condition. When I scanned it with a Tech2 their was no codes because the previous shop cleared all history. The scan data shows MAF gph at 23 idling and voltage at the voltage at the MAF sensor is 3.00 volts idling which should be around 2500 rpm. Pin voltages at the sensor are 4.90 reference and a good ground. Both 02 sensors are 900mv+ and black smoke out of the rear. It has a new optispark dist and a new ignition coil. I installed a new pcm and flashed it with the stock vin calibration. It does have a pulley driven supercharger.
Has anyone seen a problem as such or any ideas. Fuel pressure 40 and holds good, remove egr valve and it is good.

Thanks

 

Have you tried removing the SC and see how it runs? Don't see information regarding what is still on the car so have you checked back pressure? Could the cats be clogged?

At least if you removed the SC (I don't mean literally taking it all the way off the car) you could eliminate whether it's causing the problem and then you could stop looking for other components being the cause of the problem.

 

MAF sensor output is grams/second (gps, not gph). At idle, it should be in the range of 6 to 10gps. Your's is reading way too high. Are you sure you have the correct units of measurement.

And, MAF output is not a variable voltage, its a variable frequency, riding on the reference voltage.

Something doesn't sound right in you measurements.

What do the long term fuel corrections (BLM's) look like for the idle and other operating Cells?