My mechanic had assumed the ECU would automatically rebalance the new injectors. He checked the output of each injector with the scanner, showed all were very equal, figure of the output being in RPM. He then decided to select new ECU on the OBD scanner, this seems to have fixed the problem. First driving off there was pinging, but the more I drove the quieter the pinging became. After 5 minutes it was perfect. Great Mercedes technology.
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