Before I did auto-rx in my El Camino I bought a vacuum gauge and my vacuum at idle with hooking up the gauge to manifold vacuum was 17 inches of vacuum.
I probably checked this out at 330,000 miles or so.
I have done the auto-rx thing since 343,000 miles. I now have 367,000 miles on the car. I needed to tune the idle mixture screws on my carburetor, and the best way was with the vacuum gauge that I had in my tool chest.
I hooked it up too manifold vacuum after the car was totally warmed up, I could not believe my eyes, I was getting a reading of 20 inches of manifold vacuum.
The guy that sold me my carburetor said to shoot for the highest manifold vacuum, he thought I would be in the 15 inches to 16 inches range.
The vacuum gauge was solid as a rock, I talked to my Dad's friend who was a mechanic since he was over visiting, he knew how many miles were on the car, he said lets go out to the garage and I will check it, he could not believe that he was seeing 20 inches of manifold vacuum, he only saw those numbers on small block chevy's with less than 20,000 miles.
I said what does this number mean, he said " You have excellent ring and valve sealing."
My thoughts are that auto-rx cleaned the ring packs very well.
If you are going to do a Clean and Rinse using auto-rx pick up a vacuum gauge and do a before and after reading.
I think this is the only way to prove that auto-rx cleans the ring packs, unless you want to take the engine apart or do a compression test.
I am willing to take either pictures or if I can get my hands on a camcorder or whatever they call it, I will post a video with the engine running and show everyone the gauge.
