i checked the 94 O2 sensor. it is a heated sensor. the heater
resistance is within spec and, upon running the motor, the
sensor gave readings that are within spec.
so i checked the CTS while it was warm and watched the
resistance increase with temp decrease, all within spec.
these 2 sensors on the 94 apparently are working properly.
any other suggestions?
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On Apr 25, 10:45=A0am, codifus <codi...@[EMAIL PROTECTED]
> wrote:
> On Apr 25, 11:27 am, Jim Yanik <jya...@[EMAIL PROTECTED]
> wrote:
>
>
>
>
>
> > Codifus <codi...@[EMAIL PROTECTED]
> wrote
innews:4811f577$0$15157$607ed4bc@[EMAIL PROTECTED]
>
> > > nucleus wrote:
>
> > >> 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?
>
> > > Yes, the O2 sensor. The main one sticking into the exhaust manifold.
> > > Replace it on the 94 motor. O2 sensors can get "tired" without
trippin=
g
> > > the computer code.
>
> > > I replace a tired O2 on my 99 Sentra and the car came alive. The car
> > > felt more powerful and the gas mileage went up. The original O2 was
no=
t
> > > pulling any codes.
>
> > > Also, the coolant temp sensor gets "tired" as well. When its faulty,
i=
t
> > > keeps teling the computer that the engine is cold when it isn't so
the=
> > > computer keeps running the car rich.
>
> > > Now, which one to replace? The O2, because the bad CTS symptoms
inlclu=
de
> > > bad gass mileage AND the car runing a little cool. You would have
> > > noticed that your temp gage was sitting a little lower than normal.
>
> > > CD
>
> > I never heard of a coolant temp sensor getting "tired";all they are is
a=
> > NTC thermistor,a temp sensitive resistor. I had one go open,on my
Integr=
a
> > GS-R.
>
> > also,the CTS and the gauge temp sensors are separate items.
>
> > --
> > Jim Yanik
> > jyanik
> > at
> > kua.net
>
> Yup, the CTS and temp gage sensor are separate, and the CTS does get
> tired. Happened in my wife's Altima. Repalcing the CTS shot the car's
> gas mileage from an abysmall 21 right up to 27 mpg. CTS replacement is
> slow to adapt, it takes about 3 tankfulls for the ECU to adjust.
>
> CD- Hide quoted text -
>
> - Show quoted text -
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