Does anybody know the method by which a MAF equipped EEC-IV uses the Baro sensor signal to adjust the fuel delivery?
I've got a car that's running rich, and my MAF signal is reading 1.4 volts at idle, when it should be ~ 0.6 volts. With the key on, but the engine off, I have 1.09 volts. With the MAF unplugged I have about 2.45 volts. So the 2.45 is dropping to 1.09 when plugged in to the MAF, as would be expected because it is a resistor.
Talking this over, the question was brought up, is 2.45 volts higher than it should be? And what would cause this?
An idea came up that the computer may adjust it's base signal to the MAF depending on the signal from the Baro sensor.
An example of this theory, would be at sea level with denser air, the computer may step up the voltage to the MAF meter (say from 2 volts up to 2.5 volts) making it run richer across the board. At high altitude and low air density, the computer would drop the voltage to the MAF meter (say from 2 volts to 1.5 volts) therefore making it run leaner across the board.
This method would work, but I don't know that it's the way the EEC-IV does it.
Any takers?
I've got a car that's running rich, and my MAF signal is reading 1.4 volts at idle, when it should be ~ 0.6 volts. With the key on, but the engine off, I have 1.09 volts. With the MAF unplugged I have about 2.45 volts. So the 2.45 is dropping to 1.09 when plugged in to the MAF, as would be expected because it is a resistor.
Talking this over, the question was brought up, is 2.45 volts higher than it should be? And what would cause this?
An idea came up that the computer may adjust it's base signal to the MAF depending on the signal from the Baro sensor.
An example of this theory, would be at sea level with denser air, the computer may step up the voltage to the MAF meter (say from 2 volts up to 2.5 volts) making it run richer across the board. At high altitude and low air density, the computer would drop the voltage to the MAF meter (say from 2 volts to 1.5 volts) therefore making it run leaner across the board.
This method would work, but I don't know that it's the way the EEC-IV does it.
Any takers?