Quote:
Originally Posted by Peter B - CV8
Have a google search. It's mainly the inlet valve that gets carboned up - due to oil vapours from the PCV being deposited on them & getting baked on (due to no fuel wash).
On a direct injection engine, the only cleaning that the fuel/additive can do is to the injectors/piston/ring land areas. |
The only valves I had to clean were the exhaust ones .
The inlets were air cooled.