Looks like simple fix- install extra injector in intake to spray some fuel in to clean up build-up, maybe a bit smaller then stock injector and wire it to fire together with one of main injectors. 1 extra injector for 8 cylinder car would be 12.5% extra fuel which would be near the limit of adaption range but if you put smaller injector ECU should be able to adapt to extra fuel.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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