This thread seemed recent enough and most appropriate to post this... I recently obtained an OBDII interface for my laptop, partly for curiosity but also in hopes of trying to diagnose some moodiness that my car seems to exhibit. I've already had my IC pump replaced, and a number of threads suggested that the Intake Air Temperature sensor might be to blame for that symptom, if not the IC pump.

So I put the laptop in the passenger seat, and had it record Engine RPM, Vehicle Speed, Intake Air Temperature, and Intake Manifold Absolute Pressure so I could get some real numbers for comparison. I wanted to familiarize myself with the output before doing any real test runs, so I had the car in automatic the whole time and wasn't exactly racing. When I was done, I started analyzing the data, half-hoping to see improbable numbers on the IAT graph. Well, that one looked fine to me, but the Intake Manifold Absolute Pressure graph has me confused.

According to this thread and others, I should be able to subtract 14.7 from the MAP value and get boost, right? As you can see in the screenshot, MAP peaked at 50 psi, which when you subtract 14.7 gives 35.3psi of boost, which is ridiculous isn't it? Am I reading it wrong, completely misunderstanding something, or perhaps the victim of a faulty MAP sensor? Or is my engine about to explode...