The turbos might not be spooling quickly enough to keep us with fuel enrichment. In the '92 you can swap the vacuum wastegate actuator for a pressure actuator and/or adjust the ALDA. I don't think it's that easy in an electronically controlled 606. Is there more than a hair's width of radial play and any axial play in the turbos?
Sixto
83 300SD
98 E320 wagon
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