# Seafoam in Vacuum lines **URL:** \ **Category:** General Discussion\ **Tags:** accord, honda\ **Created:** [April 25, 2011, 7:57pm UTC](https://community.cartalk.com/t/seafoam-in-vacuum-lines/64065 "2011-04-25T19:57:24Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![mb5191](https://avatars.discourse-cdn.com/v4/letter/m/df705f/32.png) [@mb5191](https://community.cartalk.com/u/mb5191)\ **Post date:** [April 25, 2011, 7:57pm UTC](https://community.cartalk.com/t/seafoam-in-vacuum-lines/64065/1 "2011-04-25T19:57:24Z")
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! ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [April 25, 2011, 8:09pm UTC](https://community.cartalk.com/t/seafoam-in-vacuum-lines/64065/2 "2011-04-25T20:09:31Z")
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. ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [April 25, 2011, 8:11pm UTC](https://community.cartalk.com/t/seafoam-in-vacuum-lines/64065/3 "2011-04-25T20:11:48Z")
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. ---
**Author:** ![mb5191](https://avatars.discourse-cdn.com/v4/letter/m/df705f/32.png) [@mb5191](https://community.cartalk.com/u/mb5191)\ **Post date:** [April 25, 2011, 8:13pm UTC](https://community.cartalk.com/t/seafoam-in-vacuum-lines/64065/4 "2011-04-25T20:13:23Z")
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. ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [April 25, 2011, 8:20pm UTC](https://community.cartalk.com/t/seafoam-in-vacuum-lines/64065/5 "2011-04-25T20:20:20Z")
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. ---
**Author:** ![mb5191](https://avatars.discourse-cdn.com/v4/letter/m/df705f/32.png) [@mb5191](https://community.cartalk.com/u/mb5191)\ **Post date:** [April 25, 2011, 9:27pm UTC](https://community.cartalk.com/t/seafoam-in-vacuum-lines/64065/6 "2011-04-25T21:27:27Z")
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.