HT4100 4.1, 4.5, 4.9 Discussion, Calling all 4.5 PFI and 4.9 PFI Owners in Cadillac Engine Technical Discussion; He used seafoam in the gas tank, not the throttle body.
I have used seafoam in my gas, but didn't ...
He used seafoam in the gas tank, not the throttle body.
I have used seafoam in my gas, but didn't notice anything.
When it comes to cleaning out the engine, run a straw from the PCV valve hose and dip it in and out of the can while a friend keeps the throttle at ~2000 RPMs. Once the bottle is half gone, drop the straw all the way down. The engine should suck up the rest of the can and die. If it doesn't die, have the friend cut the ignition.
GM TEC (top engine cleaner) seems to be the popular choice at the forums, but I like seafoam since it's liquid and not a spray. You can get TEC at any GM dealership.
i have run redline fuel system cleaner on a couple acura cars i have owned and it felt like it made a difference. one bottle is about $8 is all. i haven't run it in the cadi yet. i may try it later today if i get a chance.