Good Bye SonomaST
Join Date: Sep 2005
Location: Murray, KY
91sonomast is offline
Re: Seafoam effect on O2 sensor and Cat Converter?
GM has top engine cleaner which is the same thing as Sea-Foam and does the same thing. The instructions on the back of the GM can says: "get engine to operating temperature, introduce Top Engine Cleaner through a vaccum source(i personally prefer PCV line or brake booster line), introduce approximately 2/3's can into engine. Once smoking occurs shut engine off and let sit 45-60 minutes(the stuff boils on top of the pistons, valves, anything it gets on and removes the carbon), after sitting start engine and pour the remains of can into TB ports(this loosens up what small amount may have dried up) then replace TB cover and run engine at 1500-2500RPM's until smoke clears(and buddy there WILL BE smoke, lots of it!!! and could take upto 5 minutes to clear out). Thats the instructions on the can, then i take it on a spirited drive. From what i understand per GM, if u dont hold it at 1500RPM or higher it doesnt blow the carbon out good, i always hold it 2000RPM's, even in my own vehicle until the smoke clears, all the smoke is pretty sweet, but stinks like hell, make sure ur cab is upwind from the tailpipe cause if not ur gonna smoke urself out
EDIT: if GM suggests it on Cadillac's still under warranty there arent to many adverse effects.
1998 Dodge Dakota, 2wd ECSB, 318, M1 2bbl intake, 52mm TB, Taurus fan, Ford injectors, MP PCM, MPP mid-length headers and full exhaust, Hooker Aerochamber, DJM 3/5 drop. Put back to stock and sold
2001 Grand Cherokee 4.0L, it's so SLOW!!!
1991 SonomaST, WAS SOLD, reacquired and rusting away.
I will get off at some point.
Last edited by 91sonomast; 05-30-2007 at 09:57 PM.