I'm having a hard time figuring out how to address this strange driveability issue with my 95 LT1 Corvette. When I coast down to a stop in gear with my foot off the gas, the car will almost stall when I push the clutch in and come to a complete stop. Reviewing my datalogs, I noticed that the IAC is going to zero as I'm slowing down. The datalog shows speed at 0 even though I am going 20 MPH. It looks like the divisor for the scan tool vehicle speed is wrong and the computer thinks the car is stopped, idling over speed, and closing the IAC to bring the idle speed down to spec. I have noted that the datalog will show me at 0 mph until I'm 20 mph or so and then it just jumps to some speed (below my actual speed). I thought maybe the VSS was bad, so I replaced it and the new one does the same thing.
I have adjusted the divisor for the SCAN tool and it will change the speed that the computer reads at 60 mph, but it seems to still skip over the lower speeds. I converted this car from an automatic to a 6 speed and the dash readout for speed is correct and works great. I'm using data from a 6 speed car for my scan tool divisor. Anyone know what I'm overlooking???
I'm datalogging with EEHack.
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