why not? I'm pretty sure it even says it on the can. The vacuum hose feeds directly into the manifold and all the cylinders.

I've not seen anyone who doesn't suggest doing it that way. It's not getting in the brake booster, just using that vacuum line as it's a main one.

 

Well I finally got around to "Seafoaming" my truck all in all I'm happy with the results. Right off I noticed better responce as if I got new spark plugs. And there wasnt really a "smoke show" there was very little smoke at all after letting sit for 20-30 minutes. Guess I had very little carbon buildup! I didn't put any in the oil because I just changed the oil 2 weeks ago. So I will wait before the next oil change to do so

 

Which method did you use? if you're using the brake booster hose, as you're approaching half can it helps to stick the hose in and let it take a big gulp to stall out the engine. That puts a good amount on the tops of the cylinder for cleaning.

if you didn't get much smoke though it's probably a pretty clean engine. Pickup some Seafoam Spray, it does a great job on the throttle body.

 

Lucky we don't have MAF sensors else this would be the worst idea... (Spray Seafoam) lol

 

MAF sensors aren't usually in the throttle body though are they? I thought they were closer to the filter.

 

Our trucks do not use MAF sensors they use MAP sensors along with some other sensors to calculate a "calculated MAF" value for fuel and spark.

But yes MAF sensors are usually 6-12" in line after the filter and are between the TB and Air Filter/inlet.