This is the correct way. I have a can right in front of me and thats how it says to use it.mgbgt1972 said:I've used seafoam for years on older cars with great sucess, and used it for the first time on a a Sporty last years! It will throw a few engine codes, as it burns of the O2 sensors get confussed, so you will have to re-set once you have done.
Correct way for using a can of seafoam, using the vacuum port on the side of the intake manifold, suck in 1/3 of a can, the engine should stall out, if not don't suck in more than 1/2 a can, shut the engine off and wait 10 to 15 minutes, longer is better. While waiting dump 1/3 of the can in the crank, seafoam also removes deposits in the oil and cleans ou the passages, and drop the remainding 1/3 of the can in the gas tank!
After waiting 10 to 15 minutes start and run the engine, you should produce a 'huge' white smoke cloud, you will kill every mosquitio within a 1/2 mile radius, this is when you normally throw a CEL, once the majority of the smoke is cleared take her for a run, you will still produce small amounts of smoke for about 20 minutes of driving if you have done it correctly!
I usually change the engine oil after taking her for a run, but you don't need too! The seafoam in the oil will disipate, but the sludge and varnish it removed will now be in the oil and the filter traps it.