Are you referring to the Techron that you add to the gas tank? Just want to make sure I’m following.The Volt is a direct-injection engine. Most GM cars from 2000 on use injection in the intake manifold which can create deposits on the intake valves. The TSB refers to those engines, not DI. That noted, it is probable that direct injectors can become coated with carbon or deposits. The occasional can of Techron will ensure the injection spray is correct.
Based on the design of direct injection I’m sure there has to be some deposit build up since direct injection loses the gasoline “wash down” benefit that traditional port injection has.
i am curious if anyone ever has tried cleaning or had it done at the dealer. When I cleaned my veloster there was sooo much smoke that crap that came off it on that first treatment (noticeably less on the second). It did make that engine drive so much quieter and more efficient afterwards though. I was pretty skeptical of it but my 44 year mechanic step father said it was fine to do. Just don’t stall it or your gonna hate life after😃