I ran a can of GM top engine cleaner through my car today before I changed the oil and expected to smoke my neighbors out of their houses -- but after the 20 minute soak, I started her up again, and there was no smoke whatsoever. I could tell it was getting through the system, because it was idling rough, and I could certainly *smell* it. At 132k miles, I expected *something* to burn off.
Any ideas? Maybe my engine was cleaner than I thought -- or maybe that coolant that got dumped through my failed intake steam cleaned the whole thing