Question about 1998 Dodge Ram 1500 4WD

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Replaced out flow CO2 sensor with after market from NAPA. Now when starts revs up to 1500 and back to 750 many times untill it warms up. Any ideas as to why?

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  • myoldman66 Sep 03, 2010

    did as stated, waited over night to get cool. still dos same thing


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Hello! The defective O2 sensor is an indication of carbon deposits...
The Idle Air Control is probably fouled...Remove, inspect, and clean if necessary...Guru...........Saailerreplaced out flow CO2 sensor - ff32f4e.gif

Posted on Sep 01, 2010

  • David Burbee
    David Burbee Sep 03, 2010

    Hello! Before you spend money; When you pulled the Idle Air Control, was the internal port clear of any deposits? If the port and tip of the IAC are clean and the connector wires and pins appear free of trouble...The IAC is defective...It controls the idle speed and "hunting" is a common fault...The changing of the O2 sensor, on the surface, does not have a relationship to the IAC...There is one other quick test you can perform to eliminate any possibility...

    Set an ohmmeter on the X10 scale...One probe to the center of the - battery post...The other to chassis ground...Should read very near a dead short...Move the probe from chassis ground to the engine block...Same results...If you read 200-1000 ohms; Grounding is at fault...

    The cost of an Idle Air Control Valve is around $55...........Saailer

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