What sensors will hurt mileage & not pull codes?

jaymac

New Member
Feb 18, 2004
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Northern Mass
Hey all -
Just me, still chasing "poor mileage demons", and wondering if anyone had a list of sensors that might be worn or bad that might effect a loss in gas mileage to the tune of 7.5 mpg (used to be 20, now is 12.5).
I already replaced the ECT (which had set off a code). What other sensors might give poor gas mileage but not throw a code or seriously affect driveability, cuz it drives nicely, just crappy mileage now.
JT, I still have to do the "test from the top of the tank" thing. As I understand the way the fuel level sender works, it can either read FULL or EMPTY if the electronics involved go South. So even it now tells me it's empty, I believe it may not be empty yet, na dI may b chasing ghosts, not demons... :shrug:
Maybe I'll check that tomorrow. I'll tell ya, though, I'm not lookin' forward to droppin' $40 on it :fuss:
 
well as an O2 sensor gets older, they tend switch slower and slower, thus affecting your fuel trim, sometimes it's not much to set of a code but enough to hurt milage. i replaced mine at 102,xxx im at 108xxx now, and wow! what a difference. try that. hope this helps! good luck