Q: Idle air valve calibration/adjustment

asked by on

Hi! Recently I managed to clean the lean error code by replacing the intake gasket(upper) and the throttle body gasket as well. No more code to address now, except that I think I need to calibrate my idle air valve duty or counts. Perhaps the previous owner might had messed up with the bypass screw on top of the throttle body due to the lean condition perhaps. Is there a way I can adjust it again without using a bidirectional scan tool? At least to hit 50% or so duty cycle. Our Mitsu dealer MUT tool is not working. Thanks
My car has an automatic transmission.

Hi there. It is suggested to have a bidirectional scan tool but it is not required. Verify the idle speed is within 650-750 rpm. You want to be at 700 rpm ideally. Connect data link connector terminals TEN & GND by using a jumper wire. Adjust the idle speed by turning the air adjusting screw until smooth running anywhere between 500-800 rpm. Disconnect the jumper wire and recheck the RPM’s on the meter. If you need further help adjusting your idle, a qualified professional from YourMechanic can come to your car’s location to pinpoint the proper repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Idle air valve calibration/adjustment

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: The back of my car has dropped, what could be wrong?

Hi Julissa. Thanks for contacting us today. There are several rear suspension components that could possibly be damaged on your Highlander. I'm not sure if your particular Highlander comes with an air-ride suspension, but if it does, an airbag failure...

Q: Camshaft position sensor actuator A. Bank 1

Hi there. Most modern engines have both camshaft position sensors (multiple) and crankshaft position sensors. Camshaft position sensors, in conjunction with crankshaft position sensing, allows very precise timing for ignition and fuel injection. When a camshaft position sensor fails, or...

Q: Q: Oil leaking

Hi there. The engine, transmission, and power steering system all use an oil type fluid and the systems are prone to leaks, especially in the case of poor maintenance. If you need further assistance, I recommend you have a certified...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...