Quote:
Originally Posted by Timetraveler
Rod your O2 needs back pressure to work. I don't believe in using an O2 gauge to dial your car but it can save your engine if your going lean at high rpm. Do your testing with a long extension or a muffler and get your reading. Then run your extensions with a paint stripe and cut at the end of the paint burn. 'OLD SCHOOL'
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Does NOT work. Never did. You can cut your way all of the way to the cylinder head. Air changes. Not a reliable test. Leave it where it's at. You're making your own relationship to any changes anyway.