Last time I tried using a vacuum hose that went to the duct before the throttle body. That didnt work too well at all. Where should I use instead? I didnt see a hose going directly to manifold etc. Thanks in advance CJ
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Last edited by 98SilverSable; 11-11-2012 at 04:57 PM.
Pull the hose off the brake booster. Should have strong vacuum coming from it to the intake manifold. Car might run rough because of the vacuum leak, but slowly dribble it in, do at least 1/3 can. I usually do 1/2. You may need someone to hold the gas at 1500rpm or so to keep it running, but the key is to apply it slowly. Then shut the car off for a while. Get ready for a smoke show when you fire it back up.
The idea is that by introducing Sea foam (which is a mixture of solvents) through the intake, the liquid will be sucked down into the cylinders and clean the carbon deposits off the intake manifold, runners, and the backside of the intake valves. Clean valves and runners will improve performance, fuel economy, and engine smoothness. However, the method of introducing the liquid into a vacuum port is very crude, and will really only just run down into one or two cylinders and create a smoke show. Suffice to say, the pros never do it that way. The best way to do an induction cleaning is by using a mist that's introduced at the throttle body, so the atomized liquid can reach all cylinders equally.
All the smoke gives the psychological effect that all the carbon has been cleaned out of the engine. So in a way Sea foam is the ultimate automotive placebo product, and I think that's why it sells so well.
Personally, I only use Sea foam on carbureted engines, since the carb helps atomize the liquid properly and sends it equally to all cylinders.
Spray of solvent in fine mist into Throttle Body or carburetor ..
I just run a can through my gas tank every month in Winter.
Done incorrectly you can really screw things up like O2 sensors and foul plugs!!
At $6-10 a can it gets kind of pricey for the benefit.
Sea Foam Spray for one. 3M also makes a similar product. But the professional products (like BK) use an air-pressurised cylinder that's hooked up to a nozzle placed in front of the throttle plate to dispense the product.