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94 Chrysler New Yorker is idling at around 3000 RPMs. Changed IAC and TPS. Tested both Oxygen sensors and one is reading .25 volts steady and the other is reading .75 volts steady. Please advise.

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The O2 sensors only affect fuel mixture, not idle speed.
The most common cause of high idle is a vac leak or a sticky throttle plate.

Posted on Apr 07, 2015

Testimonial: "I have checked for vacuum leak and all vacuum lines are intact, the throttle plate also seems fine. Do you have any other suggestions for vacuum leak checks."

  •  Stephen
    Stephen Apr 07, 2015

    A vac leak should cause a hissing noise. And it could be one of the gaskets, or the throttle plate could be open. Air is entering the intake from a place not allowed.

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2002 Town and Country. Why does it have a rough idle, dies when stopping, has sluggish power, and sounds terrible?


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Code p0700


take a volt meter to the TPS with the ignition on and car off. do a voltage sweep by reading the voltage at idle on the gas pedal and slowly push the gas pedal to the floor. if the sensor is good you should see a steady increase in voltage from around .6 volts to 5 volts.

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go to villager quest yahoo group for expert help. Sounds like a dirty MAF sensor. Clean heated wires with carb cleaner.

TPS readngs are good.

fuel pressure should be 43 engine off, and 34 engine running.

try disconnecting front oxygen sensor for a day & see if better.

Read All ABut files at our site.

gerry

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Replace tps in 92 cougar/


check and clean the iac first. this controls idling on todays cars.

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