It would appear there is some thread drift toward chemical treatments,,,, well, that happens.
For MODERN engines with fuel injection I like the Techron concept. There really is something to it, not just another "snake
oil". Hesitation when it's cold? Loss of power when it's cold? But runs OK and power returns when it's warm or hot? A concentrated dose of Techron could fix that! Piston slap kind of noise at various rpm's, hot OR cold? Techron to the rescue!
Carbon buildup could be the knock you hear. Todays engines run really close tolerance and even a small amount of carbon buildup will cause interference issues. The carbon buildup on the valves acts like a "sponge" when it's DRY and COLD from sitting. It sucks up some fuel from the injector spray, thus, you run lean. Hesitate, miss, loss of power. Once the DRY carbon is fully saturated, the fuel/air ratio returns to normal.
Once your this far gone, Chevron gas with Techron in it won't help, your to late. Get a CONCENTRATED can from the parts store and pour it in the tank. Might have to do that treatment a couple of times. Worked excellent on my Mercede's SLK!
The amount of Techron in the GAS at the pump is fractional, a preventative maintenance amount when used on a regular basis, not a "cure" for after your sick.
My modified side oiler with custom pistons runs a pretty tight clearance to the head at TDC (more quench, more better). I'm thinking with such a design, like modern engines now have, carbon buildup, over time and miles, might be an issue at some point on my Cobra. Is that why it runs funky when it's cold? Eh... probably not, I don't have a choke.
