EEC KOER how to get codes

[freddyk70]

Trying to read KOER codes. 77 Mustang with EEC efi system. Using a test light to read codes, no fancy scanner here

I can get the KOEO codes so I know it works, but when I start engine... nothing! No codes at all. What am I doing wrong here?

Thanks!

347 fires right up and runs great! But once warm, sometimes it won't restart after shutting off. Today it wouldn't start for about 5 min, but then started 25 times in a row immediately after!!! Gotta get those codes to see whats going on I suppose.

 

[project 87 5.0]

should work the same way. i just pulled codes on mine they same and it worked

 

[liljoe07]

If one of the codes is code 67, then the KOER code will not flash.