I have a 1998 4x4 4.6 v8 and I just got the truck and I seafoam it through the intake manifold and now it's been a month and it let's out a smoke cloud for 2 or 3 seconds and my coolant isn't leaking and my oil isn't burning it has 200,546 miles I only drive it on the weekends and the only problem I know of is i have a break fluid leak has anyone else have this problem

 

You should not use Seafoam like that, it's too hard on the cats.

With that said, it's probably valve guide seals. Nothing to worry about if the smoke goes away quickly.

Do you know where the brake fluid is leaking?

 

GLC it's leaking out of the rear right drum and I don't think it would mess with the cats

 

Seafoam will mess with the cats. A brake fluid leak won't.

You need to fix that brake fluid leak. It's probably a leaky wheel cylinder.

 

Putting Seafoam in the manifold like that breaks up a lot of carbon deposits and sends them through the engine. It can clog the cats.

I've thought about putting FI cleaner in the manifold maybe an ounce at a time and doing it on a regular basis but I haven't tried it yet. With carb or throttle body fuel injection, cleaner in the gas would keep the manifold clean but with port fuel injection the manifold gets carboned up mainly from the egr. Direct injection makes it even worse because the intake ports and intake valves get carboned up. That is a problem that Ford hasn't dealt with yet except that some of the newer engines are getting port fuel injection as well as direct injection. I've read that BMW came out with a procedure that involves removing the intake and blasting the intake ports with crushed walnut shells in order to clean the carbon off the intake ports and backsides of the intake valves.

 

GLC it is the break line connection with the hub and thanks for the information roadie I appreciate it all now do I need to change my cats out or straight pipe it or just let it ride out sense I only pull with it on the weekends

 

You don't need to do anything with the cats unless they are plugged. If it runs okay with normal full throttle power you are fine.

If you get a CEL with P0420 or P0430, the cats are shot.

 

Thanks GLC I appreciate it and you helped me a lot thanks buddy