« Last post by gashousegorilla on Today at 06:10:11 PM »
According to my experiments, the ECU doesn't use the TPS signal at idle anyway, so having it set at 0.76V won't affect the idle mixture. I've tried varying mine while watching the mixture, and nothing at all happens until it gets up to about 1.2V (if I recall correctly) and then the engine suddenly stops.
At idle the ECU uses the O2 sensor on its own to set the idle mixture.
At least, according to my experiments......
Steve, I wouldn't but much faith in tuning or trying to determine an accurate idea of what the AFR's are by using a narrow band o2 sensor. All it is going to tell you if it is Stoic, too rich, or too lean. And switch in between. My experiment's show that TPS voltage WILL richen across the range ... including idle. By plug reads and a sniffer on a Dyno.