I've always had issues with my car being rich, and I think I finally figured out why. My MAP sensor isn't set right. But I'm confused on how to set it.
I'm using a Bosch 0261230042 TMAP. According to Bosch, the sensor has a range of 20kPa to 250kPa, or .2 bar to 2.5 bar.
I currently have it set to:
Map Sensor Linear: 200 kPa
Map Sensor Offset: 9.8 kPa
Map Sensor Linear B: 66.67 kPa
I believe, according to the Bosch literature, that the settings should be 250, 20, and 83.33 respectively, correct?
If so, I'm also a little confused about actual real-world readings. Someone who has a test bench with the exact same sensor reported the following:
1psi =1.92v = 6.9 kPa
5psi = 2.53v = 34.4kPa
10psi= 3.2v = 68.9kPa
15psi = 3.86v = 103.4kPa
20psi = 4.5v = 137.9kPa
25psi = 4.84v = 172.4kPa
Well, the thing is rated at 5V max, and when I plot it, the slope would suggest that at 5V, I would get around 190kPa.
So which is it? 250kPa or 190kPa? What numbers should I use to program the Map sensor calibration? Thanks!