Maybe you can hook up a vacuum gauge and determine if the EGR is working at the specified times. Temp/RPM/Rack travel. Did you determine whether the waste gate is vacuum or pressure controlled?

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250