I don't recall ever actually checking what duty cycle the ECM calls for at the mixture control solenoid when you go to WOT. Something tells me it's 0% (full rich), but for the life of me I don't know why that is sticking in my brain.

Anyone run a scan tool and actually measured this recently? Or hacked into the BIN for a cc-QJet engine computer and looked at the tables?

 

I seem to recall it going very low; not 0%, but well under 20%. I don't thin kit ever goes to 0, as long as it's geting distributor pulses.

 

It goes to 0% anytime the engine goes into open loop. Cold engine and WOT. At those two times the engineers wanted as much fuel as possible.

 

No, in open loop it's not 0. You can still hear it clicking. Duh.

All I know is what I've observed with a dwell meter.