Could someone please tell me how do I seafoam my 4th gen TL??

 

I'm assuming you're taking about seafoaming through the intake. If so, the brake booster line is a good way. The brake booster line is the larger hose that runs from the back of the throttle body. However, that might result in more seafoam entering the rear bank. The other method is simply removing the intake and spraying it into the throttle body itself.

I haven't seafoamed my engine since I first purchased the car. Since then I've just used top-tier gas and occasionally thrown in the some Marvel Mystery Oil or Gumout Multi-System Tune-Up in the tank. Per my observations from using a boroscope, I literally have no carbon buildup on the valves or piston heads.

 

I know on my 3rd gen tl you would put the seafoam in the line connected to the throttle body manifold. There are 3 lines here which line should i use for the seafoam.

 

Sorry for the dumb question, what is Seafood?

 

Best way to SeaFoam a TL; just don't. Why? Waste of time and money for zero benefit.

 

There are videos on YouTube where very minor improvements were made using Seafoam. There's one where water was just as effective. Granted, everyone's results may differ but based on what I've seen it's been nearly negligible.

I'm not going to pretend to be an expert on carbon removal, although I'd like to think whatever I'm doing has worked since my pistons are literally carbon free. What I've done is used products with PEA which is largely accepted as the most effective chemical at removing carbon. Shell has it in their gasoline. There are a few fuel additives that have more concentrated PEA as well. The only one I know for sure is the Gumout I mentioned above but I'm sure there are others. I use it maybe once every couple of months (which is about every 4000 miles with driving Uber on the weekend) along with Shell gas and so far it's worked well.

I think if I had an engine that was a bit carboned up, I'd just go that route and clean it out slowly. That method would also clean the valves, both intake and exhaust. I would also recommend purchasing some CRC throttle body cleaner. Remove the intake hose from your throttle body and spray that in there to clean it up. It's in a red bottle. Only like $4 from Walmart. There's also CRC Intake Valve cleaner but it's in a grey bottle and isn't typically needed in a port injected engine like yours. That's normally used on direct injection engines where the fuel doesn't have a chance to clean the intake valves.

 

Back when I first started wrenching on cars, pulling a cylinder head typically exposed very significant carbon buildup on the internals; fast forward to the unleaded fuel era, especially engines built since say, the mid 1990s, and the amount of carbon found in a typical high mileage engine, say with at least 150,000 miles, is a fraction of what I used to find on an engine which was just barely broken in.

Said another way, carbon removal from an otherwise healthy engine falls into the category of, "why the hell bother?"

 

Would a bottle of Techron work? Or it's also snake oil?

Sorry to hijack the thread.

 

It'll certainly help clean out your wallet.

 

After reading your post, I grabbed three bottles of Gumout - hopefully it will make a difference on my 4G TL.
Quick question: should you put it into the engine occasionally or just pour into the fuel tank is enough to make it work?

 

You've already wasted your money, don't compound the mistake by wasting your time as well. If you can, take the Gumout back and get a refund.

 

What you trying to achieve?