Hi all,

Hope the summer has been going well for the rest of you. I had a detour in
my EC2 tuning, but am back at it.

Summary: EC2 on A controller has the engine surging at just about all RPMs I
could manage to attain. Kind of a "rummm.... rummmm..... rummm..".  I could
only get the RPMs up to around 1800 (out of a 5600 max) and the engine is
knocking and banging, and even making a 'pffffut' kind of noise. Sounded
like air or something.  Maybe coolant spewing out, because at the end of my
session today I did find coolant on the ground, from my overflow tank.  Not
smooth at all and I was afraid of losing parts! off the engine! Really
rough, never develops much power.

However, when I flip to the B controller it runs great. Very smooth,
responsive, no surging at all. I can run the engine through the full range
of RPM.  I noticed that a MAP of 22 is at about 5200 RPM.  In may I got to
around 4700 at a MAP of 22. I noted this because I was going to start with
Mode 3 programming (at MAP 22). I could not get anywhere near MAP 22.

Background: I had been making progress getting the EC2 tuned in May and
early June. The A controller worked fine but the B controller would not
function and the engine would die. TC had me remove the EC2 and send it back
to him. He did find problems with the B side and repaired it. And set all
the programming back to the defaults.

I have dual crank position sensors, one dedicated to A controller, and one
dedicated to the B controller. TC was kind enough to make the repairs before
his trip to Colorado in mid-June. I got the unit back, reinstalled it last
weekend, fired the engine up for a quick test last Tuesday night. Then
yesterday (Saturday) I just ran the engine in my driveway for about an hour,
playing with different settings. This is really when I noticed the engine
running rough on A.

I had recorded some of the values (mode 3/Mode 2) from the May tuning
sessions. I reset mode 3 to that same setting (203) but it made no
difference, engine rough.

I swapped the crank sensor connections (A controller to B cps, and B
controller to A cps), made no different. A was rough and B was smooth as a
baby's behind.

I have an EM2, but as I understand things, the EM2 really can only see
values of the A controller. Even when flipped to B.  And there is no way to
back-copy from B to A. It is always A to B. Grrrrr

I also instaled a wideband O2 sensor for the purpose of tuning. That seemed
to work OK, but I never really got a chance to use it.

So... I really need some ideas, suggestions, insights of what to try next.