Still playing with MFI (it's a weekend routine now).
I was having a bad miss (really noticable at idle, thump thump thump thump) and traced it down to cylinder #5 (no rpm change when plug wire removed). I checked the plug and it was not fouled. Then I started playing with the idle screw on the throttle body. It turns out that if I open the screw so that #5 draws considerably MORE air than the rest of the stacks (using my unisyn), the miss all but goes away and the car idles a LOT better (around 1000 rpm).
What gives?
Why is the correlation wrong for this cylinder? Fuel injectors were tested ok, plug wires ok, plugs are all good, injection timing spot on as of this weekend... Is it time for a leakdown test? Compression numbers were all ok. Valves were adjusted a couple thousand miles ago.
I'm confused now.
