Microprocessor controlled idle ECU

[Bitsyncmaster]

Hi Dave,

Does the ECU lose all its learned values after the battery is cut off?

No. It keeps any learned values with no power.

[bytes311]

No. It keeps any learned values with no power.

Cool, thanks!

[bytes311]

Does the mixture change a little if the idle is set higher than 750 RPM? I hooked up my dwell meter and noticed the needle swinging more towards the rich side of the spectrum but still within range for the FV to buzz.

I have the idle ECU set at 850 RPM. I removed the diode, backed out the idle screw, and adjusted the curb idle as instructed (using the LED on the board as reference), but nothing else has changed as far as I know.

[Bitsyncmaster]

Does the mixture change a little if the idle is set higher than 750 RPM? I hooked up my dwell meter and noticed the needle swinging more towards the rich side of the spectrum but still within range for the FV to buzz.

I have the idle ECU set at 850 RPM. I removed the diode, backed out the idle screw, and adjusted the curb idle as instructed (using the LED on the board as reference), but nothing else has changed as far as I know.

I've not seen it change mixture much with changing idle RPM setting. I guess it would depend on how good your FD is working. I have seen better more stable readings at higher idle RPM which I think is due to the non-heated O2 sensor running a little hotter. Maybe that is why the book says to adjust mixture at 900 or 950 idle RPM. You really want the mixture centered at cruising RPM anyway.