Uh, jrichker - I think I'm misunderstanding your statement there. You seem to imply that cold air is less dense than warm air - but maybe I'm misreading it. Warm air rises - because it's less dense. Same reason more homeruns are hit in July than in September - less density = less drag on the ball. Cold air is more dense, contains more oxygen - the reason why colder intake air has the potential to make more HP than warmer intake air. But, I think you drew the right conclusion - if the computer is told the air is colder than it actually is, it will try to inject more fuel than it should, making the mixture richer than it otherwise would be. However, the difference is small enough that the once in closed loop, the O2 sensors would adjust it back out anyway. In any event, this time of year, after the engine's warmed up a bit, there's a good chance that having it sitting on top of the lower intake manifold is gonna cause it to read warmer air temps than are actually entering the engine - especially if the engine in question is picking up cold air for the intake. Jrichker's approach for location is a solid one; I mounted mine in the elbow just before the throttle body. PM me with your email address and I'll shoot you a picture of it. Like jrichker - I covered the harness extension with the same corrugated black plastic covering that the rest of the harness is covered with, and you can't tell that it didn't come from the factory that way.
