Seejay
Registered Member
Would this mitigate the carbon build-up in the throttle body and intake manifold? I have not experienced the problem (and it looks like it would be a good bit of trouble to have a peek). Just wondering because there was mention of it in another thread (hijacked).
An Italian tune up is not what many people think. After the engine is good and warm, you downshift it to high revs with your foot off the throttle. This produces a terrific intake manifold vacuum causing air to rush past the intake valves and out the cylinders. Any carbon built up on the valves or on the piston goes out the tailpipe. The nanny trans on my 3.8L Genesis lets me shift it into 2nd at 45 mph, producing a burst of 5200 RPM.
Conversely, if a moderate to heavy throttle at low revs is applied just at the point where the transmission does not downshift, carbon will build up in the engine. If this is true, then ECO mode and "featherfooting" in traffic is not a good thing.
A Bit of History: The Mercedes limo engine, a mechanical DFI 6.3L V8 (pre 1972) suffered from carbon build up. Even when run with the hottest plugs available (Champion 12Y), carbon would build up tremendously. Italian tune ups greatly reduced spark plug replacement. You could see the clouds of soot coming out of the exhaust on a downshift.
An Italian tune up is not what many people think. After the engine is good and warm, you downshift it to high revs with your foot off the throttle. This produces a terrific intake manifold vacuum causing air to rush past the intake valves and out the cylinders. Any carbon built up on the valves or on the piston goes out the tailpipe. The nanny trans on my 3.8L Genesis lets me shift it into 2nd at 45 mph, producing a burst of 5200 RPM.
Conversely, if a moderate to heavy throttle at low revs is applied just at the point where the transmission does not downshift, carbon will build up in the engine. If this is true, then ECO mode and "featherfooting" in traffic is not a good thing.
A Bit of History: The Mercedes limo engine, a mechanical DFI 6.3L V8 (pre 1972) suffered from carbon build up. Even when run with the hottest plugs available (Champion 12Y), carbon would build up tremendously. Italian tune ups greatly reduced spark plug replacement. You could see the clouds of soot coming out of the exhaust on a downshift.
