Similar experience here with a Honda Prelude, only last a couple a months. I think it does remove some surface carbon, but the thick crusted carbon on the piston top is what caused the knocking.
My mechanic showed me a piston with the crusted carbon. It would take some hard work to scrape off with a screw driver. There is no way that seafoam can remove that.
A better solution is to prevent the carbon buildup by using fuel treatment periodically.
Just my 2 cents.
Quote:
Originally Posted by Masterbeatty
I used it on my 01' Altima with 190k on it and it ran much smoother. I had a lot of knocking and that went away for a few months but now its back. I dumped a bunch in the intake manifold. and the rest in the tank and it smoked like a sonuvabitch.
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