Install The Mishimoto Oil Catch Can Kit on a 2014 Ford Fiesta ST
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
Remove the engine cover by pulling up at the edges.
Locate the stock PCV line on the top-left side of the engine. Note the locations of the two quick disconnect fittings at either end (A and B below).
Use the slotted screwdriver to pry out the plastic tab holding the stock PCV line to the engine.
Disconnect both ends of the tube by pulling back on the collar.
Remove the stock PCV line.
Using the 18mm deep socket, 6" extension, and socket wrench, remove the two nuts from the upper engine mount. You might need to (carefully) use the breaker bar.
If the stud comes out with the nut, don't worry. When I did it, one came out, the other didn't. You'll just screw it back in later.
Preparing the Catch Can
Using the 11/16" wrench, screw the two hose fittings into the catch can.
Tighten them until they feel secure. The threads are tapered, so they may not screw all the way in.
Install the bracket onto the catch can using the 2.5mm allen key screws and washers. Note the orientation of the bracket in the photo below.
Installing the Catch Can
Attach the bracket to the engine mount using the nuts you removed earler. Torque to 60 ft-lbs (81 N-m)
With the hose that has a 90 degree bend at the end, put a hose clamp over it and slip the hose over the IN fitting on the catch can. Leave the hose clamp loose for now.
Insert the other end with the quick disconnect into the rear PCV port. It will click into place if you did it correctly.
With the remaining hose, put a hose clamp over it and slip the hose over the OUT fitting on the catch can. Leave the hose clamp loose for now.
Insert the other end with the quick disconnect into the front PCV port. It will click into place if you did it correctly.
Tighten both hose clamps at the catch can side. Do not over tighten. Also, make sure to orient them for easy access.
Double check all hose clamps, screws, nuts, and quick disconnects are properly secured and torqued. Then, go for a drive and make sure nothing pops off.
The manufacturer recommends you empty the catch can every 1,000 miles until you get a baseline for how much oil is collected. You might be able to empty it at every oil change if you are not collecting much.
Reinstall the engine cover if desired.
Congratulations! You now have a little piece of mind, and hopefully you can avoid an intake cleaning in the future.
Also, please note that the video linked in the Source section below contains a different type of quick disconnect from the one shown in my pictures. Maybe your car has the one in the video, but they're both easy to operate, and produce a click when they lock into place.
Upper Engine Mount Nut Torque 60 ft-lbs or 81 N-m