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Why is my truck idling too high

Replaced ECM and IAC but still is idling too high

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  • 3 Answers

A bad oxygen sensor or mass air flow sensor are the most probable.

Posted on Nov 21, 2014


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 150 Answers

SOURCE: idle at 1500 to 2000 rpm

Most likely the throttle body gasket (between the throttle body and the intake manifold) is leaking.

Posted on Feb 12, 2009

  • 77 Answers

SOURCE: Saturn SL 2002 High Idle

Intake manifold gasket. Leaking where intake meets head.

Posted on May 07, 2009

  • 204 Answers


have you replaced your intake gaskets? this is a problem on these trucks with high milage. to see if your intake is leaking spray it down with Brake cleaner and if it is leakin you will hear a drop in Rpm's
hope this helps
please rate me
Thank you

Posted on May 08, 2009

  • 3600 Answers

SOURCE: 1993 chevy truck with a 350, it wont idle right,

error code 43 is a mas air flow sensor.

Posted on Aug 31, 2009

  • 1 Answer

SOURCE: High idle at start up low or high idle during driving

massair frow sensor

Posted on Dec 04, 2009

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Hi, my rpm stays on high after cleaning the idle control valve

An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The cars computer or ECM (electronic control module) receives information from various sensors and will output signals to adjust the IAC motor in or out to adjust engine idle speed by controlling engine idle air. ----------------------------------------------------------------------------------------

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Typical poor IAC control is cold stalling or slow idle speed response to changes in electrical load, The IAC is check by monitoring Idle RPM,when you turn on the head lamp and press brake pedal,The IAC responds for electrical load, You say you cange the ECM,it has to match if you are protocal CAN,without a reflash the behavior of the transmission is compromised, Whenever a transmission component or transmission change is performed the ECM must have its learned value performed,Yes the ECM could of been the solution,as for removing the ABS relay your vehicle has a zero point calibration.Flash the ECM

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You may have some carbon build up in the throat of the throttle body itself. That buildup may also have plugged a small air hole in the throat. The carbon build up keeps the throttle plate from fully closing against the stop.

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Idled high, replace IAC and PCV, now idles low and stalls

On modern day cars the parts that get fitted need to be adapted to the ECM using a decent diagnostic machine. I bet that this was not done and the car is now suffering as a result.
Something to try is resetting the ECU, simply disconnect battery for 10 minutes, reconnect, then start car from cold *without touching gas pedal* and leave idling until the rad fan comes on (this resets all the base idle settings) then take it for a drive - hopefully will solve the problem

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OBD does not control, an idle logic circuit does, Disconnect the battery and let it relearn idle speed, it has fuzzy logic capability, so it learns your driving habits.

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