Originally Posted By: OtisBlkR1
I think i will try MMO instead of seafoam for my next clean up, to many bitog'ers rave about it so i will give it a try.
Careful if you mean MMO through the Intake. I did MMO though the brake booster hose on my old 97 Monte Carlo, and I essentially caused a misfire bad enough to cause drive-ability issues a blinking service engine code (scanner said misfire), and smoke enough to think that I had blown a head gasket or created a serious opening in my engine that shouldn't have been there. I got frustrated and bought my grand prix the next day.
However, the next day the monte ran better than it had in quite a while, with no codes. I wish i hadn't let it go....
I have had success with both MMO and Seafoam through the PCV and Brake Booster, however the time noted above has led me to believe that MMO should be used in smaller quantities in this application.