Question about 2000 Nissan Quest

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The idle keeps going up and down and my check engine light does not goes on.. i change the mass sensor and the problem is still there. also change the idle control valve and problem is still there what can it be ...can you help me with that

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Throttle position sensor.

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When running, why does the engine "hunt" and doesn't run stead(ily)?

Your mean it surges ! The idle goes up an down , not running at a Constant or steady speed . Well , a vacuum leak could cause that . Could have a IAC - idle air control problem , mass air flow sensor , TPS - throttle position sensor , map sensor , fuel injector problems . The first place to look would be having a scan tool hooked up . A professional type ! One that can view engine sensor data . Also check the battery an the charging system .

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You need to take it an have a professional type scan tool hooked up an have sensor data parameters checked . Could have a mass air flow sensor problem , IAC - idle air control motor. If the check engine light was on before ,it will come on again , after a couple of start up's from cold to warmed up. Regular gas won't hurt it , maybe some pinging (Spark knock ) But the knock sensor will take care of that . (Retard timing ).

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Sounds like a dirty air filter is putting the mass airflow sensor out of range. The throttle position sensor is subject to physical wear, the age of your truck warrants replacing it. The coolant temp sensor controls the Idle Air Solenoid which determines idle speed ( cold, high idle, 1200 rpms open loop mode for the ECU) and (hot, low idle, 800 rpms, closed loop mode for the ECU) If the truck does not have a Mass airflow sensor, check the Manifold absolute pressure sensor (MAP). Perform an OBDII scan for stored fault history to avoid buying parts you don't need. Do the cheapest fixes first. Go ahead and change the fuel filter also. There is a lot of water in todays fuels

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There are no codes showing, my check engine light is off, and my truck is still running rich. I have already change the o2 senser and it idells up really high when you start it.

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