can you leave your engine on when pouring seafoam into intake manifold suction line??

 

it'd better not to cause the seafoam wont have any time to actually clean any sluge or carbon build up thats there. its best to let the seafoam sit there for about 10-15mins so that it could hve time to break away all that sluge and gunk

 

Um it should be on and revving so it doesn't clog your stuff. Everytime I have done this (granted it was on carburetor engines) I had that _____ on full blast

 

after you let the seafoam soaking in the engine for 10-15mins, yea u turn ur car on and revv the hell out of it to get rid of all the gunk the seafoam loosened up. it's going to be hard to tur the car on at first so u'll need to pump the gas pedal a few times till it turns on, then keep the rpms above 3k.. i just did this to my car and my wifes car about a month ago with no problems..