After reading about all the success stories with Seafoam, I decided to try it myself. I have a 96 Jimmy with 226,000 miles. I first tried pouring it in the TB but the least little bit caused it to stall out. I then tried through the vacuum line and it worked much better. I poured in about 3/4 of a can and it smoked a little. I then cut it off and waited about 10 minutes and restarted. There was no smoking at all, I then took it out for a drive and still no smoke. Is this right, I know I should have seen more smoke from what everyone said?

 

Which vacuum line did you use? Was it one that went directly to the intake manifold?

To answer your other question, yes it should still be smoking quite a bit until it's cleaned out... Unless of course it wasn't that dirty to begin with??

 

226k should have smoked a lot, should have poured it all down the intake, it cleans better anyway