I removed my plenum and bottom intake since it had it PnP. To my surprise, since I seafoam or CRC the car about 4-5 times, and I only have 21,546 miles on the car. The valves were full of oil and carbon. I was able to clean 4 sets of the valves to new conditions with a lot of intake cleaner, toothbrush, and towels. I was only able to partially clean two sets of valves since they were open and I was not sure how to move the valves so they will close. Sorry, I did not take pictures because my hands were dirty from the oil/carbon deposit and it was raining. I'm surprised no one has made a DIY on how to clean the valves because its a big issue. I have been running a catch can since roughly 8k or 10k but maybe my catch can is too far. I will be swapping it out to a mishimoto compact catch can to get it closer to the PVC. After I installed everything back I sprayed two full cans of the CRC GDI cleaner since when I was able to spray it directly to the valve it did a great job. I wish I had the tool the dentist use to suck up liquid since I will pool the valves and use the toothbrush to brush off the gunk. Removing the gunk water was an issue so I used shop towels and they did the job. Unfortunately, two sets of valves were not fully cleaned because they were opened, I cleaned the side walls but was concerned all the gunk going into the pistons. I was not sure how to move the valves so the open ones will close. Next Saturday I will spray two more bottles of CRC GDI cleaner since I think its better than seafoam and change my oil to Motul from mobil 1 and move my catch can closer.
Intersting facts: The driver side was a lot worse than the passenger side. Does anyone know the size of the bolts of the bottom intake? I will to swap them for ARP bolts. I will also be swapping out my spark plugs since the one I took out had the same gunk on the tip. I will be going with NGK and a will be getting a canned tune soon from BTR.
After all this the car was so smooth,quiet, and much better acceleration. It was running great and the computer is still learning but I'm not sure what effect the more balanced air flow from the PnP will have the on the engine. I prefer the CRC over seafoam since its foams and heavier in consistency versus seafoam. Plus the CRC does not create that big white smoke show that you see with seafoam but it does clean the gunk like nothing else when I was directly spraying it to the valves. If we are able to clean the valves like I did we should be able to avoid the need for a walnut cleaning but how do I close the open valves?????