#749, "RE: Megasquirt'nSpark Extra- Board Mods for Ignition control & 420A Wiring Diagram" In response to In response to 0
A note about the wiring diagram on the Sourceforge site - the way they illustrate how to hook up the TPS signal is not a very good method. My TPS signal was always very noisy and I would see a lot of spikes, for example… at idle, my raw ADC value for the TPS could be anywhere between 33 and 40, which is a huge range. Sometimes the noise was able to trigger my acceleration enrichment/enleanment, which caused some interesting problems especially at idle. The workaround is to cut the stock ECU out of the loop completely - run +5, the TPS signal, and ground from the MS to directly the TPS. I left the original TPS wires to the ECU taped off. My idle is now MUCH better, the raw ADC value for 0% is now 33-34, AE doesn’t tweak out anymore, and over run fuel cut works consistently.
