Well, I got a different used ECU and VERY CAREFULLY installed it, also checking voltage on airflow sensor potentiometer (in spec), current to EHA (slightly below spec cold but car was slightly warmer than 20C test point). Started car and came up to a smooth idle right away and runs very well. Drove it around tonight with my DVM hooked up to the test points #2 and 3 on the diagnostic port. On initial startup duty cycle was reading a steady 50% (I think this is normal as the system starts out in open loop), then after a minute or so duty cycle started oscillating. The range was mainly in the 60-70% range, with some values jumping beyond that. Occasionally it would hold at 50% for a second or 2 and then start oscillating again. On the freeway the car seems to have great power (for a 1990s luxury car). Give it a lot of gas at 60mph (3000 rpm) and it will kick down and accelerate fast and smooth to 5000 rpm (when I backed off to avoid a ticket). It seems to be ok from a standing start too. Runs smooth as silk. Now for my question--WHAT IS NORMAL POWER? I've seen on the 0-60.com website that the 190E did 0-60 in under 9 sec, but it doesn't specify whether it was a manual or auto. I watched a utube video of a 190E doing 0-60 in under 9 sec, but it sounded like a manual with a good driver. Before I fixed the ECU mine was doing 0-60 in around 15 sec, with the main issue being low rpm power off the line. Now it does 0-60 in 12 sec, with better power off the line but nothing great. What experience do you have with your 190E 2.6 times from 0-60? I have tested the throttle position switch resistances and they are ok. Is there some type of fuel enrichment at full throttle that isn't working right? I'm planning on taking the car to a transmission shop and get it adjusted for smoother shifting, but don't want to do it until I am sure the engine is running right.