On Apr 19, 7:44=A0pm, nucleus <rose122...@[EMAIL PROTECTED]
> wrote:
> have been driving a 94 and 96 nissan sentra for several years. =A0THE
> 96 CONSISTENTLY AVERAGES OVER 4 MPG GREATER THAT THE 94.
>
> both are stock cars, 4 door, 1.6 liter engines, 4 speed/overdrive auto
> transmissions, have same brand & size tires and use the same tire
> pressures, which are adjusted monthly. both cars have almost identical
> total mileage. =A0no dragging brakes.
>
> the 96 has a different shaped body and is presumably more
> aerodynamically
> efficient. =A0however, both autos are driven in the same city & highway
> mileage
> conditions. =A0the 96 gets better mileage in city driving, than does the
> 94.
>
> is there some sensor, that DOES NOT set a computer code, that can
> cause
> the computer to run the 94 engine richer than the 96 engine?
Do the plugs look different between the two cars? If one is really
runner richer the plugs on that one might show more carbon deposits.
I presume the thermostat is working well on both and is the same
design temperature. Beyond that, if you really want to track it down
you can start by putting a scan tool on it and observing the fuel trim
and the oxygen sensor behavior. Good luck. Al
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