Quote Originally Posted by Booba5185 View Post
The KR reading is what the PCM retards from the ignition advance. It lines up with our PM's earlier. Stock WOT timing is 15* You had your Cen-Tec showing 11*, so basically at that point you had 4* of KR. If you had 7* of KR, you'd be at 8* (assuming we're talking about WOT).

The fuel trims are the PCM's way of compensating for a rich or lean condition. It has a preset AFR it is trying to achieve, and the fuel trims are the percentage of fuel the PCM is having to add or remove to achieve that AFR. It's a little more complicated than that, but that's the basic gist of the idea. So if you have a rich condition your fuel trims will be negative since the PCM is pulling fuel (closing injectors faster than normal). If you have a lean condition fuel trims will be positive since the PCM is having to add fuel to achieve the AFR it wants.


I'm not 100% sure, but I believe the max advance is 50*.

OK if the max advance were 50... and I assume thats 90 in tool speak... and the # on tool is 2, the degrees retarded would be about one. Eh? No?

Knowing now how the fuel #s work and that at WOT both should be 0, that helps. But I do need a boost gauge and KR monitor dealy bobber thingy lol.