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O2 sensor mileage

uid 39390's pic
posted by  EJO on  Fri Mar 16 07:43 CST 2007
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last visit: Wed Jun 17 05:55 CST 2009
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I'm trying to get a little better mileage out of my B230FT (93 944T). Will replacing the sensor work or do I also have to replace Air Mass Sensor. Is replacing this sensor hard? Or what other things can I do to the engine to get a little better MPG these computer controlled car just adjust everything and I don't know what. The useage is currently @ 20.4 MPG at a constant 70 mph Hwy. driving for 3 hrs. or more. This engine should be able to get 25 mpg or more at that speed.
Please advise what I can do.

I understand the lead-foot and acceleration problems, I'm looking for a mechanical solution not the physical one I know.
--
EJO now a 1993 944T 193K; ex '65 123S; ex '75 245; and ex '81 242GT; also Chrysler 2002 T&C and 2006 MINI Cooper








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O2 sensor mileage

uid 17648's pic
posted by  Shifted on  Fri Mar 16 10:44 CST 2007
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last visit: Sat Nov 19 19:05 CST 2011
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Replacing the 02 sensor or MAF sensor will only benefit your mileage if they are faulty; your first task should be to test these (per the FAQ's). If they are within spec then swapping them is a waste of money.

Better to check thoroughly for vacuum and intake leaks, and inspect your ignition system (plugs, wires, cap, rotor and distributor) and make sure your timing is set to spec. Also be sure your tires are inflated properly and wheel alignment is good.

It's easy to lose 3-5 mpg with a handful of little things not quite right; I'd look at those first before I started replacing expensive parts...

Shifted








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O2 sensor mileage

uid 39390's pic
posted by  EJO on  Fri Mar 16 13:16 CST 2007
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last visit: Wed Jun 17 05:55 CST 2009
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Shifted
Thanks I'll check for vacuum leaks although I don't know how. (I can't hear anything as I'm half deaf) Is there a way to check for leaks?
Electrical and timing are relatively new (3K miles). Tires are new and nitronized (which I recommend to all) and aligned.
I hope it is a vacuum leak as I can replace hoses at a lot less $$$ than the sensors as you mentioned
Thanks,
--
EJO now a 1993 944T 193K; ex '65 123S; ex '75 245; and ex '81 242GT; also Chrysler 2002 T&C and 2006 MINI Cooper








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O2 sensor mileage

posted by  Chris Mullet on  Sat Mar 17 01:00 CST 2007
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last visit: Fri Oct 24 09:08 CST 2014
[RELATED]

How old is the air filter?








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O2 sensor mileage

uid 39390's pic
posted by  EJO on  Sat Mar 17 13:20 CST 2007
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last visit: Wed Jun 17 05:55 CST 2009
[RELATED]

air filter about 5000 m in Michigan driving (wet climate not dry)
--
EJO now a 1993 944T 193K; ex '65 123S; ex '75 245; and ex '81 242GT; also Chrysler 2002 T&C and 2006 MINI Cooper







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