There's more to the gunk buildup inside an engine, than just carbon deposits. Different gasoline and oils with dozens of additives that build up over time and develop as part of the combustion process.
You may not have a single problem to correct, just because of buildup, it just happens with time.
Seafoam has three ingredients. Pale oil, Naphtha, and Isopropyl Alcohol. Naphtha is used as a cleaner among other things. It's also used in gasoline, I'm sure some of which belong to the 'special detergent ingredients' gasoline companies advertise.
Anyone that has cleaned/tested fuel injectors with Seafoam can verify that it works well as a cleaner. There's no reason to think it doesn't clean similar buildup out of your engine. I personally have not torn down one of my 200K + engines just to see any Seafoam results, so you'll have to do your own investigation there, haha.
There should be no harm in adding it to the intake, and following well known directions you won't hydrolock the motor. Seafoam ingredients are found in fuels and fuel injection/carb cleaners available off the shelf, so you're not introducing anything to the engine that it hasn't already encountered.
Whether or not it produces noticeable results probably depends on the condition you keep your engine. Fresh oil changes, good gas, good plugs/wires, etc.

 

Unless you are completely stupid and dump the whole can in suddenly it won't hydrolock it.

But the cold liquid hitting the hot valve can bend them.
Look at a race car with Zoomies - the tennis ***** are not just in case it rains, even the cold air after a run bends hot valves.

But - it's your engine - fall for internet lies if you want.
The economy needs your money.

All I can do is warn you.

 

Seasform doesnt work

 

Every month or so someone starts a seafoam thread and everyone fights over it.

I've seafoamed through brake booter of several old and newer vehicles and never had an issue and felt a differnce ever time. And any cold liquid added to a hot vehicle will do harm that's why you add to crankcase when vehicle is cold.

People need to lean to agree to disagree about seafoam cause these threads become repetitive. Yes seafoam makes a difference in the vehicle. Whether you wanna believe I it's good or bad leave it to yourself. I've never had any bad results from it only positive

 

So seafoam huh?? Does it work? Just kidding. I like reading these threads to educate myself. I see a lot of ppl like it and a lot that doesn't. So I really have learned nothing lol. I have been considering doing it to my 96 with 205,000 but I will wait til I find a good conclusion to the conundrum.

 

What I get out of threads like these is the debate between opposing view points and things I might not have otherwise considered. I find the whole process very informative. If you keep an open mind and understand exactly what something's supposed to do, how it works, and how the systems it effects work, this sort of thread can provide a lot of value.

After reading threads like these I've picked up the following:

- Seafoam is supposed to be a chemical/solvent to clean away deposits
- Effectively clearing deposits will help engine performance and efficiency IF the deposits are causing problems
- Cleaning something that isn't already dirty won't do anything for you
- Cleaning massive chunks of carbon off of parts in the combustion system can cause new problems, like fouling your spark plugs, cat, or getting lodged in valves
- Pouring cold stuff into a hot valvetrain is a bad idea
- Thinning oil too much is a bad idea
- Dumping a bunch of not-really-compressible liquid into your intake is a bad idea
- Blasting away heavy deposits in the block/head/crankcase can cause issues if they become lodged somewhere important, or if they were hiding a leaky seal, or covering up a bad bearing

But overall, Seafoam has a very specific application, isn't a magic fix-all, and any time you do something to your engine that is beyond normal function, you are taking a risk. Especially with something as polarizing as Seafoam, it's important to sort opinion from fact and come to your own informed conclusion, then decide whether you are comfortable with the risk.

 

OP got his ? asked and answered by post #3.....seems like things went south after about #8, no?

 

Ha, so true. Well OP click the link on my sig for full instructions on seafoaming.

These threads always turn out the same. Like the oil ones

 

How we seem to go from asking an honest ? to blindfolds, tennis ***** and race cars is beyond me. LOL

 

It always turns this way. And usually we never hear from the OP again

 

I seafoamed today ! Gotta admit idles a lot better ! Throttle response hmmmm maybe ?

 

Just thinking out loud here, but with all the dealers/spiffy jiffy oil change places that exist, do any of them wait for a car to cool before draining/adding fluids?

 

I'm thinking of doing it too on a 95 4.0 ZJ with 220K on it, what was the mileage on yours if you don't mind?

Just worried that all that gunk is whats holding my truck together haha, but want to see if it helps with my emissions and rough idle any.

 

Hahahaha people are silly

 

Has anybody here actually hydro locked their engine from using seafoam or gained any other problems? I mean personal experience, not something you heard or read, but personal experience.