Well I've got my '89 300E running well again but did notice a bit of a gas
smell. Lambda (duty cycle) was about 30% (ie 70% of the time V was high) and
therefore running rich. With the new oxygen sensor and the ICV operating
correctly finally, it's time to set the duty cycle right. Using pin3 on X11
I've adjusted the 3mm recessed hex set screw on top of the air filter housing
to give a 50% duty cycle.
I noticed the idle rpm is now quite 'responsive' to load.... is the 50% duty
ratio correct or should I run it a tad rich/lean? I'm grateful for any