What are they and what should they be at? My actual IAC position at idle is 0 and the iac min keep alive position is 11? I am trying to get rid of an idle stumble. See it idles fine around 800rpm for about 20sec and then stumbles and the car shakes then idles fine. During the stumble I also get knock retard.....Just idleing I get 100's of counts but if I drive I get maybe 20 or so more.....Car mods in sig....

 

No sig. If still running an '89 code mask/ECM the value at location $1B9 is the RPM threshold to allow knock retard as: Val = RPM / 12.5

Set it to 1000 RPM or so.

RBob.

 

I am running the 730 SD now...

 

Scroll down a tad for the subject: idle knock (7730)

RBob.

 

I have a hex editor and the bin loaded....but where is 820a? My bin file stops at 8000?

 

Drop the $8000 part off. Location $820a is the address once the EPROM is placed into the ECM. In the EPROM the address is $20A.

IE: the EPROM is offset by $8000 by the address decode of the ECM.

RBob.