Guys i done a sea-foam treatment on my 97 F150 4x4 with 141k miles on it, however it showed no immediate results. When i poured a 1/3 of the bottle in the fuel tank, 1/3 in the oil, and disconnected the brake booster and allowed it to suck the remaining 1/3 of the can into the hose and finished it off by allowing it to sit for 10mins before i cranked it and ran it up and down the road with pretty high Rpms, i didn't show any sign of smoke. What could have went wrong?

 

your engine is clean then hahaha
i did the same thing and mine didn't do anything

 

if your engine is already clean there won't be any smoke. also a lot of the smoke people see is the actual seafoam burning off and not actually the carbon burning off as they say.

 

seafoam doesnt do squat anyways.

 

Right, - but it can really screw some stuff up, like your converters,-along with possibly costing the user a motor. It can vapor lock the engine.

 

Cat converters are bad , I had the same problem i didnt see smoke after 10minor more