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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.
--
Mike
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Mike Fontenot
Apex Consulting & Services LLC
Lakewood, Colorado
303 / 731-6645
mikef AT apexconsultingservices DOT com
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