Engines with direct injection can suffer from carbon buildup on the intake valves. This buildup can be caused by oil passing through the PCV system into the intake, getting baked onto the intake valves over time.

PCV stands for "Positive Crankcase Ventilation", and it keeps pressure from building up in the engine's crank case and damaging the engine. This pressure is often called by "blowby", which is when fuel and gasses from the combustion chamber blow past the piston rings and into the crank case. Without a place for that extra pressure to go, it would build up and blow out seals or cause other damage. Instead of venting those harmful gasses into the atmosphere, modern cars will recirculate those gasses into the air intake system, burning it off.

Often, oil will get sucked up into the PCV system. An oil catch can, also called an oil separator, will "catch" the oil and pass the gasses on to the intake. You just empty the catch can periodically and dispose of the contents safely.

This article is for a kit that is specifically designed to fit 2014 and 2015 Fiesta STs. These instructions could still be helpful for other kits.

Time: 30 minutes

Difficulty: Not Bad