Re: ITB Conversion on sixteen valve 4AGE On my stock bigport AW11 a leaking exhaust manifold gasket brought about the O2 sensor to browse lean and it pumped gasoline into your motor. Gasoline economic climate plummeted until I sorted it out. I didn't locate the section I used to be https://4ageblacktopengineforsale83567.glifeblog.com/33551812/top-latest-five-toyota-4a-ge-urban-news