I blew my engine shortly after following those instructions to use the whole can, it has cost me thousands.

 

Liquids do not compress, given a good enough battery and starter you will bend a rod adding products like this into the intake in large volumes. Same thing can happen with fuel, or water, pretty sure every has heard of "hydrolocking" before. Best bet is to just never do this.

 

You can't hurt a thing if you do it correctly :-/

 

First, if you are talking about doing an induction cleaning, not a t/body cleaning, you use the whole can, you don't poor it in, your meter it over 1 to 2 minutes and by doing that there is no way in hell you can damage an engine. This process has been done by shops for over 25 years.
So Disco West, either you did something way wrong or your engine was about to die anyway.

 

I think I should have bolded "LARGE VOLUMES"

 

If one were to add that much fluid that fast in order to cause a hydrolock situation, well I guess they should be paying someone else to do their maintenance. You can run gallons off water through the plenum and not hydrolock an engine, it just needs to be done slowly.

 

Those who have had problems are not talking about a "seafoam induction cleaning" while the engine is running. It's squirting a whole can of carb cleaner into the intake with the engine off and then starting it. It seems like at best that could dilute the oil somewhat, maybe kill a bearing, and at the worse it could hydrolock an engine if it were to all drain into one cylinder. All that fluid must go somewhere. Either way, there's no reason to use a whole can.

 

Exactly. If anyone cares to look at my links, they'll see I was following this site's recommendation & instructions for throttle body cleaning with carb & choke cleaner (approved for fuel injection). The result of following the instructions exactly, was the locking of the engine. Which for the record was resolved with no sign of damage. In fact, it now runs much better. I'm not sure it was because of the cleaning, or because the previous owner had two plug wires crossed & firing in the wrong cylinders, either way I'm experiencing good results so far.

I've been doing the Seafoam induction cleaning for about 10 years with no hitch, thank you very much.

 

Your post. or get in and update with a caution. Some of those cans are 32 ounces. All og that dumping into the intake can go down a trumpet and hydrolock a cylinder. 2nd person I have seen with this problem too.

If you put the left side on a block so it doesn't run out, you are dumping a quart of liquid into the intake. Not a good idea.

 

This is the first I have ever heard of.