MAF screen is intact.

I was thinking about fuel pressure and checked the vacuum line to the regulator. But if the pressure were high at low load the PCM would have to pull fuel then rather than...

Understood. I won't mess with the VE tables while in the stock configuration.

Vacuum leaks are much more influential under light load and the fuel trims are fine there. I've had the MAF sensor...

This is interesting. Does this mean that if I want the speed density tables to be accurate that I need to disable the MAF before tuning?

Dave W,

Thanks for chiming in! I ran the EEHack analysis myself which is how I knew the PCM was adding as much as 17% extra fuel. I was wondering if this is common on MAF equipped cars on E10 fuel...

I wanted to bump this and ask specifically; Why are my trims are so out of whack? It looks like it PCM is compensating for a lean condition at anything above light load. I don't need the exact...

My CCM appears to function well except when communicating with the PCM in diagnostic mode, and perhaps at other times, leading to the persistent "SYS" message. I had forgotten about the CCM code 81,...

From what I can tell the car is 100% stock other than a K&N drop-in air filter that came with the car. The wideband is not yet installed. When I get the car on a lift to change the O2 sensors I'll...

I got my SparkFun FTDI breakout to 16-pin ALDL cable assembled last night and was soon communicating with my 1994 Corvette. Today I took it for my first ever data logging drive.

The log begins...