nucleus wrote:
> 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 am, 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
tripping
>>>>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
not
>>>>pulling any codes.
>>
>>>>Also, the coolant temp sensor gets "tired" as well. When its faulty,
it
>>>>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
inlclude
>>>>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
Integra
>>>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 -
>
>
You know what? This may be by design. Looking at the history of Nissan
engines, if you look at the SR20DE, the 91-94 version was the most
powerfull. Why? Because that motor had faster, more aggressive cam
profiles. Those cam profiles killed fuel economy and emissions. The
newer SR20DE motors were less powerful but cleaner due to the milder cams.
Something tells me your 94 Sentra has more aggrressive cam profiles in
its GA16DE motor than the 96 Sentra. In other words, the 94 should feel
a bit more powerful than the 96 motor.
If that is what you observe than that's just the way it is.
CD
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