legacycentral bbs

i bought some seafoam and am planning on running it thro. ive looked around and see that the PCV hose is the place to run it thro...haha but which hose is that??
nooby i know.

The best way to run the seafoam through the pcv is to remove the valve out of the intake mani. and get a vac hose small enough to fit into the pcv valve hole, run it from the can to the hole, and it'll suck it right up.
Be careful not to flood the engine, just do a little at a time.
Also, you'll need to either fiddle with the throttle while you do this, or have someone on the gas pedal, otherwise the car will stall at an idle with it removed.

While that is the best location, an easier alternative is through the brake booster vac line. It might not balance out evenly, but it works.

Bdub wrote:The best way to run the seafoam through the pcv is to remove the valve out of the intake mani. and get a vac hose small enough to fit into the pcv valve hole, run it from the can to the hole, and it'll suck it right up.
Be careful not to flood the engine, just do a little at a time.
Also, you'll need to either fiddle with the throttle while you do this, or have someone on the gas pedal, otherwise the car will stall at an idle with it removed.

awesome thanks

i was told this only goes to 1 cylinder tho????? wrong?

You were told wrong. The PCV valve dumps right into the main airflow of the intake. Seafoam here will go to all cylinders.


And +1 (got it correct this time Nate ) to Nate's suggestion to use the brake booster vacuum line. It doesn't distribute quite as well, but after half a can, I'm inclined to think you're getting enough everywhere. That is the location I personally use.

skid542 wrote:You were told wrong. The PCV valve dumps right into the main airflow of the intake. Seafoam here will go to all cylinders.


And +1 (got it correct this time Nate ) to Nate's suggestion to use the brake booster vacuum line. It doesn't distribute quite as well, but after half a can, I'm inclined to think you're getting enough everywhere. That is the location I personally use.

oh ok, thanks for clearing that up

In terms of central location, the PERFECT place to induct any kind of top engine cleaner is that purge valve vacuum hose right on top of the throttle body... you can see it clearly in that picture. Not only is it centrally located and has the best chance of even distribution to all cylinders, it is small enough that flooding or hydrolocking the engine would be pretty difficult.

However, that engine cleaner might wash the beneficial black goo off the throttle plate. The jury's out on that one.

You may also run it through the gas and oil.

Tleg93 wrote:You may also run it through the gas and oil.

i did it today, but it didnt really smoke all that much, so i dont think i put enough in the intake, it took forever for it to suck it all up

DerFahrer wrote:However, that engine cleaner might wash the beneficial black goo off the throttle plate. The jury's out on that one.

I want to know how black goo anywhere in the intake tract can be beneficial.

On my old Jetta I cleaned a ton of block goo off the mechanic MAF plate and the throttle blades and that thing went from a snail to a snail with better throttle response.

joeWM wrote:

Tleg93 wrote:You may also run it through the gas and oil.

i did it today, but it didnt really smoke all that much, so i dont think i put enough in the intake, it took forever for it to suck it all up

in the gas it's a horrible cleaner. Seafoam is best used as a top end cleaner through sucking it in while running..

Everyone says to use a hose and put it in the can but I did that and even with a lot of throttle it still killed the engine pretty much instantly.

I just got a hose with a small funnel in the end of it and poured it in a little bit at a time while holding the throttle open probably 3-4K rpm and then when I had about half can in there I let go of the throttle and let it suck up enough to kill the motor and let it sit for 15 mins. Then started it up and took it for a spirited drive to burn it all off. I never noticed any difference on that car but I never had any problems with the motor to begin with.

The other legacy I did it on had really bad lifter noise afterwards. But after a day or two the noise went away. I was pretty freaked out during that time though. Thought I had fucked up the motor.

James614 wrote:I want to know how black goo anywhere in the intake tract can be beneficial.

From what I understand, the black goo that surrounds the throttle plate helps seal it closed, thus allowing more accurate air metering through the IAC valve and giving a more stable idle.

DerFahrer wrote:

James614 wrote:I want to know how black goo anywhere in the intake tract can be beneficial.

From what I understand, the black goo that surrounds the throttle plate helps seal it closed, thus allowing more accurate air metering through the IAC valve and giving a more stable idle.

The airflow restriction (especially under light throttle) doesn't cancel out that benefit?

I've never heard of a car where the throttle blade(s) worked in any better condition than squeaky clean. But then again, not too many people clean the rest of the intake and leave the TB dirty for comparison, so I dunno... Sounds plausible.

The TB's with the needle valve adjustment.....if you remove the black sealant, you'll cause yourself issues especailly if you don't know about the sealant. You'll have a high idle and can't figure out why. Been there, done that, cussed a lot.

http://www.main.experiencetherave.com/subaru/images/TB/

So, is that goo pre-applied or build-up? Looks pre-applied, but the context I've heard it used in implies a build-up? (otherwise I'd think you guys would refer to it as actual sealant)

It's pre-applied from the factory.