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We do NOT recommend ever using any solvent based upper induction cleaners when the engine is running. While these are safe for a port injection engine with "soft" carbon, GDI engines the deposits are far greater and form into a very hard and abrasive, almost sand like material so when loosened while engine is running some is always forced between the piston and cylinder wall causing scouring. Also, as the cylinder pressures are so extreme (11.5:1 CR and fuel introduced at 2,000 plus PSI) a good deal is always pushed past the rings and into the crankcase where it mixes with the oil and if oil is not immediately changed, can cause damage, rod bearing noise and failure being the most common. Search here for the threads on manually cleaning the intake valves, they are the only safe and effective way to clean them.
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