Mahran90

Can you tell me what happened actually I think I did a mistake Ive added STP high mileage fuel injector cleaner and next day I added SEAFOAM high mileage fuel injector cleaner.
So next day when I started the car a big amount of smoke is coming from my exhaust and now mostly after driving a long journey at highway and then driving in the city I see a cloud of smoke coming from my exhaust.

I tried topping up the fuel when it reached half tank of gas in order to less the concentration but smoke is still coming after a long drive please advice?

My car is LS430 2005

I used SEAFOAM HIGH MILAGE alone without mixing it with STP the smoke never happened before

PrimeDave

I'm big on NOT putting ANY additives in ANY of my fuel tanks ever. But you probably should've not cross contaminated the fuel tank with both additives. I'm no expert on that so don't quote me on it.

What made you want to add the seafoam the very next day after you already added the STP? Why not burn off the entire tank with STP in it. Then if the problem persists, then do seafoam?. Why the aggressive method of double additives?

400fanboy

It was my understanding that seafoam in general smokes like crazy, surprised you'd never seen the smoke before.

But yeah mixing two different products, even similar ones, can yield weird results. I have no idea the implications. It's probably fine?

Stroock639

i did seafoam once many years ago, by FAR the most smoke came from adding ⅓ of the can to the vacuum line... like filled up my whole street with white smoke when i stepped on it lol

it should start to go away after a few minutes though, this was only with seafoam though i never mixed it with anything else

timmy0tool

iTrader: (7)

moved to the LS430 forum.

also seaform injector cleaner (rightmost) you put into the gas tank differs from the regular stuff that you put into the engine directly via a vacuum line (leftmost). which one did you use?

either way you should not have doubled on the STF and seafoam so close together like that. you just have to burn it off and the ramifications will be unknown (fouled plugs, bad O2 sensors, inefficient cats, etc).

AVSRacing

I've never used Sea Foam but I've watched youtube vids where they all smoke like crazy. I was gonna try Lucas Fuel Treatment but never got around to it.

ls430w140

I researched this a lot, and concluded that it makes sense to clean the intake with seafoam spray (not motor treatment) at 2.5k rpm, then two cans of BG44k for two separate half tank treatments.

It did make a huge difference. Almost instanteous reaction to gas pedal plus smoothness.