Seafoam in Vacuum lines

honda
accord

#1

Hey everyone, I picked up a bottle of Seafoam at the car store today (sale) and I was planning on putting it in the vacuum line. Will this make any improvements in engine quality? And above all, is it safe in my 2002 Accord? It has a 4 cylinder engine with vtec. I was going to use the portion of the vacuum that comes off of the brake booster. Thanks in advance!


#2

Is this listed on the lable? Why do this? If you’re going to this trouble, you might as well use a de-carboning cleaner, like the one sold at GM dealers. But this is only worthwhile to solve a problem.


#3

Seafoam is sold as a decarbonizing cleaner, and sending it thru a vacuum port is the method.

It will certainly burn some carbon out of the intake. Will it help anything? Maybe, maybe not.


#4

Yup, seafoam says it can be used in the vacuum lines. You pour about 1/3 pint into the engine’s lines while running, shut the car off, then let it sit. When you start it up again, there is a great deal of white smoke that comes from the tailpipe. I’ve never heard of anyone having a bad experience with it though. A friend of mine has done it several times on his vehicle. It apparently cures a rough idle (something that is plaguing my car, it comes and goes) I thought I might give it a shot if it is safe.


#5

The key to it being safe is how fast you add it (way too fast could hydrolock it). I wouldn’t use the brake booster, you want a thin vacuum line to slow down the treatment. Might have your friend help you do it.


#6

Alright, so I went ahead and did it. I put about a third of the can through the vacuum line. Let it sit, and started it up. A nice plume of white smoke came out of the tailpipe. BUT, the car actually runs smoother! I didn’t believe it at first, I thought it was snakeoil, but I’ll be darned, the stuff works! The idle is remarkably smoother. I highly suggest it.