My 3.3l ford has documented 222 idle hrs and 30xx total crankshaft run hours with 142k. Based on service records and condition there is zero question it was a highway beast. Now that I peeled off the intake manifold to do plugs I noticed that the valves are clean only one their seats but the stem and fillet area are heavy on carbon. For this being a GDI / PFI dual I was kinda bummed to find this. There are no symptoms or issues so I am hesitant to go any further.
1. How can I make the engine favor port injection for a while to use and additive?
2. If I use the zip tie method and let's say some carbor breaks loose can this ruin the intake valves from it not sealing?
1. How can I make the engine favor port injection for a while to use and additive?
2. If I use the zip tie method and let's say some carbor breaks loose can this ruin the intake valves from it not sealing?