4.0 seafoam treatment

[qtacclia]

I have a 97 sport that is starting to idle rough and not getting the fuel mileage it once got. If I seafoam the engine should I use the whole can? Will my mileage increase? I plan on changing plugs afterwards to autolite xp103's. Thanks for the help

 

[bryanhbre]

I've done the seafoam trick on my Lincoln TC, but IIRC I only used half of the can through the PCV Valve, but read the instructions on the can. You may want to change the spark plugs afterwards because that Seafoam can make bad plugs worse. I think it can mess with the O2 sensors as well but I didn't have any problems with those.

 

[celly]

I always use a whole can when I use Seafoam. Never had any issues. Mileage "should" improve, but I've never noticed a huge increase. I swear by Seafoam though. Your smooth idle and better overall performance is noticeable.

If you have a SOHC in your Sport, use the "IAC Method" to get the Seafoam in, not brake booster method as they suggest on the can. You'll get WAY better coverage and it's relatively easy to do (vs the PCV valve method) There is a link somewhere on EF on how to do it. You'll need to search for it.

 

[96V8Xploder]

SeaFoam is a 100K engines best friend.It works wonders and will surprise you how well it works.I have used it for years,before they even sold it at stores.It was made by someone else but it is the same product.

I put 1/3 of a can in the fuel tank with about 5 gallons of gas in it. I let the engine idle and get hot then I take the rest (2/3 can) and feed it into the brake booster vacuum tube as fast as possible without stalling the engine.(The large vacuum tube)Once its all gone turn the engine off right away.Let it sit for 10-15 minutes.Restart the engine and be ready for a smoke show out the exhaust.Run the engine at 2000 rpms for around 5 minutes with entermediate revs around 3500-3700 rpms to clear the smoke out.Some engines hardly smoke and some will not smoke depending on how clean the intake and cylinder chambers are.

This will burn off tons of build up deposits inside the intake and cylinder chambers while cleaning the fuel injectors and valves.

(Get the engine hot before you feed it into the intake,and let it suck it in as fast as possible without killing the engine)This insures you get a good coat inside the intake and in the cylinder chamber.

After using this product you will get a smoother idle,better throtle response,and YES helps fuel milage.The best product on earth.

 

[celly]

I put 1/3 of a can in the fuel tank with about 5 gallons of gas in it. I let the engine idle and get hot then I take the rest (2/3 can) and feed it into the brake booster vacuum tube as fast as possible without stalling the engine.

I've got a 5.0 as well and this issue has been discussed numerous times on this board through the years. The design of the 5.0 does not allow much coverage of your cylinders when you go in through the brake booster line. Sort of like "pissing in the wind" is how it's been described.

The consensus view is that going in via the PCV valve vaccuum line is the way to go with the 5.0. I couldn't agree more after using the brake booster line a few times and FINALLY figuring out how to get at the PCV line (hard to reach). WAY more smoke and much better results. I had a persistent ping issue (pretty common with the 5.0) and only the PCV method got rid of it.

There's a huge thread on this method here. Well worth your while to try it.

p.s. Sorry to hijack. This thread started with questions about 4.0 and Seafoam after all.

 

[96V8Xploder]

I've got a 5.0 as well and this issue has been discussed numerous times on this board through the years. The design of the 5.0 does not allow much coverage of your cylinders when you go in through the brake booster line. Sort of like "pissing in the wind" is how it's been described.

The consensus view is that going in via the PCV valve vaccuum line is the way to go with the 5.0. I couldn't agree more after using the brake booster line a few times and FINALLY figuring out how to get at the PCV line (hard to reach). WAY more smoke and much better results. I had a persistent ping issue (pretty common with the 5.0) and only the PCV method got rid of it.

There's a huge thread on this method here. Well worth your while to try it.

p.s. Sorry to hijack. This thread started with questions about 4.0 and Seafoam after all.

Thanks,I undestand some cars dont get a good enough destribution to all cylinders so info like this is great to no.Different methods will give different results.I always try and use a vacuum tube located near the throttle body,The first point of were air enters the intake.It doesnt hurt to experiment.This product is harmless to an engine.I use it in my oil all the time too.So just remember,its not a race car,"it will treat you like you treat it".Its a Ford.Dont abuse it amuse it.