Even though you have a BoosterPlug, if you follow my sequence it will have a different effect. With the O2 sensor disconnected and the Motronic reset, the BoosterPlug will always add 6% to your fuel. After a while of running closed loop the BP effect is greatly diminished
However if you are running Ethanol fuel you need to connect the BoosterPlug in a different way for this test. That is because ethanol is 4% too lean. Normally the Motronic in closed loop corrects for this. To run the test open loop you need to add 4% for ethanol and 6% to get a richer mixture. The BP can be wired in series with the IAT for this test.
Is your fuel with or without ethanol? Any chance you have ever run leaded fuel?
roger 04 rt screwed with this post 11-25-2012 at 04:38 AM