[Christ]

Carlos - I think what Clark is trying to say there, is that depending on the situation, your ECU may periodically dump fuel to cool down the pistons, if the ECU thinks that you're running too hot for too long a time. You'd have to monitor/record real-time AFR to figure that out though... or look for a spike in injector duty.

This seems plausible, because dumping fuel is a common way to cool internals in an engine (wasteful, but it works faster than waiting for the radiator to do it.)

Maybe the WAI in combination with the grille block puts you right on the line, and it's possible that you're going over the ECU's "safe limit" once in awhile, and it might be dumping fuel thinking that you're heading for catastrophe, as a way to cool it down and prevent meltdown.

You might consider watching your temps, O2 output, and injector pulsewidth with something that you can download a timed map of them, and compare the signals, looking for spikes in each, and how the signals correspond with one another. You just might find where your "sweet spot" for temperature is, then you can make a CAI/HAI hybrid that will allow you to maintain a given temp more accurately, keeping you on the threshold, but not "in the house", so to speak.