(See post above) yes those are their instructions. My buzzing stopped immediately. I then drove the car to the freeway and took it up to 100mph and back down. I then drove on surface streets with different speed limits. Then I took the car home, parked it in the garage and let it idle for 30 minutes. I have to assume that the CCU needs to relearn the TA.
Anziani
'93 300CE 198K
'95 E420122K

Similar problem with my '94 E320t was cured by new spark plug wires and coils.

__________________
Robert Fini

'12 ML350 BlueTec, 100k
'06 E320CDI (x2)
'05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 70k
'97 C36AMG, 319k (son's)
'94 E320T, 249k
'93 190E Sportline LE, 168k (daughter's)
'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Vintage Racer build in progress)