99 Subaru Impreza RS2.5 & Seafoam

[SOUPNAZZI]

I'm having issues with Seafoam. How the heck you supposed to apply this Seafoam?

I looked intensively to the top of the motor.

From the intake manifold, I can see 2 Vaccum hoses.

1 large one that runs from the brake booster to an intake runner, Can't use this one, cause the Seafoam will only be applied to 1 cylinder.

The smaller one is bolted on top of the manifold, below the TB. this hose runs underneath the manifold to somewhere's land. But I'm sure I can dis-connect it and suck up the product from there. but I don't know what it's connected to? If it's gonna cause problems during the treament.

Is it true that after applying the Seafoam the Spark plugs will need to be replaced?
If so, then should I use water to de-carbon the cylinders instead?

I want to do both or is that overkill?

 

[unDummy]

Add it to a full tank of gas and don't worry about it

Unless you know the end effect of pulling on hoses, don't! You could trigger a CEL/SES which will require resetting.

The problem with backyard mechanics is that you could do as much harm as good. When in doubt, don't bother!

 

[bkrell]

I've used tons of Chemtool (which is even harsher than seafoam) and never had to change plugs. Yeah, dump it all in the tank.