i mentioned this to a friend of mine and he said he ran a full can of seafoam through the vac line?, i would think split it between the vac line, gas tank, and oil like mentioned then it would clean everything or will it still work if its all through the vac line? i think ill still split the can up when i run it through blue either way

 

I've heard rumers of hydro-lock, so be careful with the brake booster part!!
Just my two cents. I'm going to try it myself!!

 

i never thought about the possibility of hydro lock with that good thing to think about when i do mine

he said he put it all in while the engine was running then he shut it down for a couple mins then fired back it up and ran it till the smoke disappeared with no problems so he should be in the clear if it was going to hydro lock it would have done it by now but since he ran it till the smoke cleared im gonna say its burnt out by now...

 

how ive always done it and how i advise to do it is 250-500 miles before oil chang 1/3 in gas 1/3 in oil/ and then pull the brake booster line shove it in the can and let it suck up every thing in there. engine will spit and sputter a little then stall out crank it up and smoke will pour out. (swore to god i fed somthin up the first time i did this) run the motor till the smoke gone. not a good idea to run down the road. cops dont like all the smoke. the seafoam cleans out a lot of the carbon when put hrew the vac line. helps loosen gunk in the oil hence putting it in right before oil change and works as a fuel injector cleaner in the gas.

 

I've never heard of anyone hyrdolocking a motor with Seafoam, even when they suck down an entire can.

I ran a half a can through the booster and a quarter can in each tank without any problems at all. Of course I was hoping for a dramatic smokeshow and did it in an empty parking lot on the weekend...I hardly got a puff after 15 minutes of sitting.

We did my buddy's Civic on the same day. He had some smoking, but you could actually HEAR the car idle more smoothly and quietly following the half can.

If you're going to add it to the crankcase, make sure you're planning an oil change soon, and beware gunked up old motors, there are some folks in 80-86 that had too much carbon burned off, and now they're burning oil.

 

when you guys talk about a "can" - 1/3 can in vac line, 1/3 can in gas, 1/3 can in crankcase..... what is the size of that "can"? is it a gallon, quart, pint....???

 

It's about the size of a pint. Not sure on exact oz's. Pretty much a pint though. They're cheapest at Walmart. You dont' need to ask q's here. Instructions are on the can.

Someone did post on this forum a while back that a Seafoam rep did tell him that you can hydrolock and possibly damage your engine. The can directions say to add it slowly so that the engine does not die.

 

I guess it is possible, but you'd have to suck up the can pretty damn quick, or be carbed and pouring it right down the throat.

When I did my 302, it made sure to let me know when I was going too quickly. It wasn't really very happy with me. If she stumbles, pull the vac hose out of the liquid and let it get back up to speed. Use a shallow plastic cup or bowl or something to hold the Seafoam in while you do it. Trying to pour from the can is just going to result in wasted Seafoam.

 

I put a whole can thru my lightning,thru the brake booster hose. Yo cant just shove the hose in the can. it will stall the engine. What i did was pour the SEAFOAm in a clear container, the just let the engine suck up only what it needs to keep running. After the whole can was sucked up. i turned off the engine and let it set for 20 min. Then fired it up and went for a hell ride!! With all the smoke you would of thought i wasn't running head gaskets!! It worked. truck idles way smoother and no more ping. Seems more responcive too

 

What I did was pull off a small vacuum line and stick it in the can. I'd just put it in and pulled it out over and over til she was satisfied.

 

i bought some for my grey truck and ran it through this morning while i was bored at work...i ran 1/2 in the vac line and 1/2 in the gas tank, im not due for an oil change for a while so i decided against putting it in the oil...

i pulled the vac line off and poured straight from the can, if you pour it slowly from the can the vac line sucks it out as it needs it, when it gets too much it stumbles but then it catches up and starts sucking again

I did not stall my engine and i dont think it would be a good idea to let it stall while sucking liquids through vac lines, i just waited till it downed the half can then shut it off

i noticed an improvement in the idle almost immediately after i restarted it, ran much smoother and once back on the highway it sounded and ran smoother at all rpms, it picked up some acceleration also and it got better MPGs i think ( i gotta make some more miles before i can confirm this) the throttle used to be touchy, it would rise and fall while driving down the highway it no longer does this

i am very happy with this stuff, it made a major improvement i cant wait to run it through blue and see what happens i would recommend this stuff to anyone

 

I saved a part from a different fuel system cleaning kit, its a hose that has an adapter with a small hole/orifice on the end of the hose you stick in the can, and a conical shaped adapter that you shove in the brake booster vacuum hose.

Usually takes about 10 minutes or so to pull half a can thru it, then I put the rest in the gas tank.

I like to think i change oil enough to keep sludge down, so havent used it in the crankcase.

Like most others, I like the stuff