I hate to disagree but my unit is 227 (no hardware update) and I have never had any problems with comms with the engine on. What am I doing right? 
. My car is a 1998 MGF VVC:
The VVC was initially the worst for this and so I did a lot of work on the software so that when you are viewing live data it basically just displays the data whether it's good or bad.
This is not how these protocols are
supposed to work. They are supposed to check for errors and fail or try again.
What I did with the MEM2J is a pretty nasty hack that it doesn't even really check it. Whatever garbage the MGF throws at pscan, it just tries it's best.
So if you look at the screen I am guessing that you will see random dashes and weird data appearing on the screen at times. Some cars are worse than others.
Later on we figured out a hardware fix that makes the data a lot more reliable.
Maybe I could look at whether a similar hack would work with MEMS1.9 ....
But in the end if you want the best experience then you will need the hardware mod.
227 has not been updated.
