Making Sense of EEC IV Codes and tests

[95mustanggt]

My detonation problem is still present and I am getting tires of the timing still being set at 0 degrees.

I connected a jumper cable on the diagnostic port and ran a KOEO test. I did get one code but I'm a little lost on it here how the test went:

start test. 3 single flashes 2 seconds apart.

4 second delay

3 single flashes 2 seconds apart

6 second delay...single flash...5 second delay

single flash, double fash, triple flash. Atleast this is what I saw. I have not run a KOER test yet.

I replaced the IAT sensor and cleared the codes and the car is running better, but is still detonating when the PCM advances the timing every so often. The detonation is fairly light. I am running Exxon 89 octane fuel.

Before I try to test all the circuits (TPS ad EGR are suspect to me) anyone have some ideas. It's well over 100 degrees down here and to a Canadian, it's just too dam hot to spend too much time under the hood.

Help.

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1995 Mustang GT