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Use the ones on the throttle body, not the intake manifold. You want it to cover as much of the inside of the mani as possible. Of the four ports from the front to the back of the car on the throttle body, I used the second from the front, and took a long section of vacuum tube and stuck it in the can with the engine running. Next you're supposed to hold the throttle open part way - I kept mine about 3k rpm - and let it suck most of the seafom in (depending on how much you're using). Then you're supposed to let the engine stall out, which I did by slowly releasing the throttle until the engine died, and while it was still sucking seafoam. Now that the engine is stalled, turn off the ignition and wait 15 minutes. Fire it back up and go for a drive. My motor gave the usual huge clouds of white for a while, but afterwards, I was left with a motor that pulled oil past the rings, and spewed blue smoke at full throttle over 5k. It took about an hour of driving while varying RPM (sorta like breaking in a motor) before the smoking got better. From what I've gathered talking to Zai, its because it breaks so much crud down that it ends up getting stuck in the ring grooves on the pistons, and prevents the rings from maintaining the proper tension against the cylinder. ATF soak afterwards anyone? I'm not sure whether the seafoam contributed to the current state of my poor motor, but I know I'll probably never use it on a assembled/running motor again. Works great for cleaning parts though.
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