how to use seafoam thru vacuum line

Serge850T · Post by **Serge850T** » 29 Mar 2008, 15:08

Can anybody give me a step by step instruction on how to feed seafoam thru vacuum line? Thanks!

Post by **MadeInJapan** » 29 Mar 2008, 17:21

It's really very simple. I assume this is on either an 850 or early model 70 series? Just take the throttle cover off and you'll see the vacuum tree under it with several small vacuum hoses connected to it. You will also see one or two of the outlets (or inlets) on the vacuum tree capped off. Pull one of the caps off and attach a hose to one of them. With car idling and warmed up, take 1/3 to 1/2 a can of the seafoam (depending on what you're going to do with the rest of it) and slowly dip the loose hose into the container with the seafoam. You want to suck the stuff in as fast as possible without killing your car. You'll hear it suffer some but that's ok as long as it doesn't die. Once everything is sucked in, kill the engine quickly and let it sit for 10-15 minutes while you pull off the vacuum line and re-cap the vacuum tree. After your wait, crank your car up and allow it to burn off all of the seafoam. If your intake or valves are really dirty from carbon you'll get a lot of smoke. Just keep the car either moving or revving semi-high until everything is burned off and you have no more smoke. Then you're finished. Hope it works for you.

wallie · Post by **wallie** » 29 Mar 2008, 19:15

Just don't do it in your driveway or any where else where someone might recognize your car later as the one that blew out all that smoke for a long time

Night time near an interstate on ramp works pretty good.

Serge850T · Post by **Serge850T** » 30 Mar 2008, 01:37

Can you give me a diagram on how it looks like. Sorry, I am a newbie and want to do something good to my car and want to save money at the same time. Thanks.

wallie · Post by **wallie** » 30 Mar 2008, 01:50

MIJ gave you some good advice that should get you through it. Take the throttle pulley cover off and you'll see the vacumn tree, you should have a capped port on the tree, remove the cap and use that port. Get a piece of tubing sized right and follow MIJ's directions in conjunction with what the can says, you'll be fine.

I don't have a digram per say but it's very straight forward and not hard to do, if that's what you think your car needs?

If you look around you might find a write up with more detail as well as two different schools of thought on doing it vs. not doing it!?

Post by **MadeInJapan** » 30 Mar 2008, 08:16

If you need the vacuum line diagram for your car, it should be on a small sticker under your hood closest to the passenger side windshield. I would say however that the description here will help you more than the diagram.

Post by **JRL** » 30 Mar 2008, 08:42

If you're going to Seafoam your car, allow me to give you a hint, (I JUST did this with great success).
Go by the directions and put in all three (3) places, the line, the gas tank and right into the crankcase.
Follow the instructions to the letter and you should have success.
WHY are you using it would be my first question?
I had two cylinders with little to no compression. This car was clogged up one end to the other (at 155K miles).
When finished we now got over 168 to 174 in every cylinder and the car now is twice as quick and very smooth!

Serge850T · Post by **Serge850T** » 30 Mar 2008, 23:59

I will be doing the seafoam to improve the performance and hopefully prolong the life of the engine. I have 129,000 mileage and not fuel efficient (runs only 15 miles/gallon. It has a vacuum leak with CEL 315 code due to evap system. I am still in the process of trying to locate for the leak. I have 2 questions: 1. how do you check for the compression and 2. how do you check for the leak. There is the leak test for AC, can we use that in the vacuum system? Thanks.

Serge850T · Post by **Serge850T** » 31 Mar 2008, 00:39

What is an italian tune up?

Post by **Maxbaby** » 31 Mar 2008, 20:33

An Italian Tune Up is where you go and drive your car with the pedal to the floor, running it as hard as you can in theory to blow out the carbon in the engine. There's a reason why they sell tune up parts in Italy in addition to this tune up method...