Seafoamed the 4Runner
So I did the Seafoam treatment today. Definitely makes a difference. I've done Seafoam in the oil and gas before, but never through the vacuum line. For what it's worth, I really think it's not even worth doing if you don't do the vacuum line portion.
My 4Runner is 2006, has 90K miles. I'm doing this just prior to the 90K maintenance. I used 2.5 cans of seafoam since I had some laying around, and if you read the directions on the can you need more than one if you want to treat oil, gas, and vacuum.
First I warmed up the car and then found a new neighborhood under construction so I didn't smoke anyone out. I turned the car off, and pulled off this vacuum hose that was posted earlier in this thread.
The right one is under the engine cover, but is easy to get off without removing the engine cover. When you start the car, the hose will have a noticeable vacuum suction. If you pull the other one, you won't feel any suction.
With the engine at idle, I slowly poured seafoam down the tube. It was slow enough that it was pretty much sucking the seafoam off the lip of the bottle. I used about 1/2 a bottle. There was light smoking from the exhaust during this. The engine also slowed down while adding the seafoam. I just stopped when it did so it didn't stall.
After pouring it in, I cut the engine, poured half a bottle in the oil, and a bottle and a half in the gas. I let it sit about 6-7 minutes.
I fired up the 4Runner, and it sent a plume of smoke, but when I started driving it made a ton of smoke. I couldn't see out the rear view. I also had a misfire on cylinder 6. I drove about .5 mile, shut it off, turned it back on, and everything felt fine. Took about 10 minutes to stop smoking. After 30 minutes of driving I pulled over and cleared the CEL from the misfire.
It might just be a placebo effect, but I felt like it required much less effort for the 4Runner to get on the highway, AND to maintain 80 mph. It felt much more effortless, and passing (85-90mph on I-95) felt responsive and easier.
Anyway, I figured I'd share my experience. This was MUCH easier than I anticipated and great results. Oh, the engine idles lower now too, just around 500 rpm. It was up close to 1000 rpm before. I'm going to run the tank of gas through and then take it in for service.