Seafoam

Reply Subscribe

Thread Tools

Search this Thread

Jan 18, 2005 | 04:50 PM

mikey whipreck

Thread Starter

Melting Slicks

Joined: Jun 2004

Posts: 3,032

Likes: 4

Seafoam

Did a search for this product, and it seems alot of forum members have had a good experience with this, so I'm going to try it in my '85 L98 (74K miles). But have a few questions that I couldn't find answers too:

1/3 in the gas tank ... that's easy enough to figure out

1/3 through the EGR tube? or the PCV valve? how do I do this? and is that even right?

and 1/3 into the oil... I couldn't find anyone else that actually did this. So I'm not sure if I will or not. I plan on changing oil less then 100 miles after adding the Seafoam, so I think it would be okay to add... should I just pour it into the 'Oil Fill' spot at the valve cover?

Jan 18, 2005 | 05:05 PM

comp

Team Owner

Joined: Sep 2003

Posts: 88,393

Likes: 2

From: eville in

i don't add to the oil till right before a change and not every time.. just dirty system's

Jan 18, 2005 | 05:14 PM

Wayne88

Race Director

Joined: Jan 2004

Posts: 18,727

Likes: 711

From: Bergen County, NJ

Quote:

Originally Posted by mikey whipreck

1/3 through the EGR tube? or the PCV valve? how do I do this? and is that even right?

I did this .
You do it with the engine running, I poured it into the Brake Booster hose, it gets sucked thru the plenum thru the runners, and its supposed to clean everything out.
There will be allot of smoke coming out the exhaust when you do it.

Heres a link
http://members.nuvox.net/~on.roz/cars/z28/seafoam.html

Jan 18, 2005 | 05:23 PM

Dale1990

Le Mans Master

Joined: Apr 2002

Posts: 5,727

Likes: 46

From: Waukesha WI

St. Jude Donor '15

Personally I would put it all (maybe two cans) in a near-empty tank of gas then find a lonely stretch of road and beat the tar out it (literally!) for a few miles. Pulling it in thru a vacuum port would have poor distribution on an L98 and if your not careful you could pull too much into a cylinder and lock it (rare but possible).

Going thru the tank would also allow the injectors to see some detergent - probably the most important part.

I do this with GM Top Engine cleaner every so often and it can really clean up a rough idle (after all the normal tune-up stuff is done).

Jan 18, 2005 | 06:19 PM

mikey whipreck

Thread Starter

Melting Slicks

Joined: Jun 2004

Posts: 3,032

Likes: 4

i've done the normal tuneup stuff...
I'm positive the engine is carbon'd up pretty badly, so I thought I'd give this a shot.

I didn't feel very comfortable with sucking the stuff through a vacuum line anyway...

so it looks like 1 or 2 thirds in the tank, and 1/3 in the oil.

any other opinions?

Last edited by mikey whipreck; Jan 18, 2005 at 06:23 PM.

Jan 18, 2005 | 06:32 PM

Wayne88

Race Director

Joined: Jan 2004

Posts: 18,727

Likes: 711

From: Bergen County, NJ

Quote:

Originally Posted by mikey whipreck

so it looks like 1 or 2 thirds in the tank, and 1/3 in the oil.
any other opinions?

I put some in the oil, but only went 50 miles before I changed the oil.

I have this weird feeling that anything like that might erode the gaskets--Intake manifold or valve covers.

Jan 18, 2005 | 07:08 PM

Dale1990

Le Mans Master

Joined: Apr 2002

Posts: 5,727

Likes: 46

From: Waukesha WI

St. Jude Donor '15

Another thing to note is that many of these types of cleaners can be "tough" on the cat meaning if you have to pass emissions I would not run too much thru - some is ok but try not to go nuts with it. This includes the GM stuff according to some dealer mechanics I trust.

My cars have no cats so I run thru a pretty heavy dose.

Jan 18, 2005 | 08:27 PM

mikey whipreck

Thread Starter

Melting Slicks

Joined: Jun 2004

Posts: 3,032

Likes: 4

The cat has been gutted on my 85...

and if I add any to the oil, I'd put 50 or 60 miles on it tops before changing the oil. I'm hoping that eliminates any negative effects that might occur.