Hum… Okay Keith I didn’t see your edits. I’m going to try your suggestion at EDIT #1
This is going to be a long reply.
About the ports… You know Richpin right? He has a video on EGR insufficient flow. He was cleaning both ports. I am a bit confused cuz you said I don’t need to remove the manifolds but he had the engine off the car and removed both the intake and exhaust manifold in order to clean them. He was probing inside those ports and the EGR ports with a wire like you suggested.
I just finished the Seafoam treatment. I got the smoke show and all that. Let it soak for 10 mins and tried driving as aggressive as I could.
Here is what happened:
-
After the soak, I couldn’t give it full throttle at all cuz it would ping every time I tried. I then took the freeway and tried accelerating to 80 mph, then let it fall to 50 mph and gave it full throttle to 80 mph again. I drove about 10 miles this way.
-
Went back to the area around my house and tried to take on those crazy hills full throttle. I tried full throttle from a dead stop. I also tried full throttle after going up slowly at about 10 mph.
-
Seems like the car is performing better, or maybe it is just placebo. I couldn’t hear it ping while going up the hills, nor accelerating from a dead stop. Strangely, I did hear it ping lightly 3 times when accelerating from 30 mph to full throttle in regular roads.
I drove aggressively for about an hour, but I am still not sure if it one can of Seafoam helped or not. How often can I do this treatment? I will report back in the morning and drive as usual and report back.