Sorry I did switch to *F the last run, Haven't tried the run up the mountain pass without an air cleaner but did empty 0-90k 2,3,4 gear and still felt that dead spot @ 3900 rpm, so I think that rules that out?
That 147hz translates to roughly 5 inches of vacuum @ wot is possible i'm geting a ventury effect from the air speed passing the map vacuum port @ the back of the upper intake?
Mjp, I agree with you that it's not a open/closed loop issue after that last run, no deference in vehicle speed or rpm regardless of open loop / closed loop operation.
But if it's a lack fuel issue why no performance gains when adding 33% fuel trim at wot with o2 sensor signal dragged down to 200mv? and why the 147 hz map signal @ wot? (never heard of the moates quarterhorse, I'll do some research on that)
Thanks, Dom
(p.s going up the same mountain pass this weekend, good time to prove any theories by experimenting keep it coming)