Re: O2 sensor: Location and testing
You're right. Are you absolutely sure you don't have any exhaust leaks at the headpipe, or manifold to head connections? If you're still (after changing the front sensors) seeing virtually no change in LTFT at cruise or idle, I'd next take a real close look at this. Sometimes on deceleration and idle you will get double digit lean (I've never seen rich under these circumstances) readings, but the longer you sit at idle they'll normally correct back to near zero. Maybe Frank has some more ideas??
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