Originally Posted by
steveo
if it's not in the adx file already, chances are you'll have to patch your bin file to replace other less important variable with the memory addresses of timing and egr duty cycle. this is a trivial operation if your xdf has been written well, but it does require acquiring some tuning gear....
if you wanted, a non-electrical solution to monitor EGR duty cycle would be to put a vacuum gauge in between the EGR solenoid and the EGR valve with a tee and run a peice of hose to your dash. you'll be able to see how much EGR duty cycle is commanded by the amount of vacuum applied to the valve vs actual engine vacuum.
on another note have you checked fuel pressure yet?
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