Idle problem

Hello,

This sounds like a problem with your vehicle's Idle Air Control Valve(IAC). I have included a link for you down below that will take you to a guide for it.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

I have also included vehicle specific information for you in the diagrams down below. Please go through these and get back to us with what you find out.

Thanks,
Alex
2CarPros

Hi and thanks for using 2CarPros.

Most times this problem is related to only a few different things, a vacuum leak, plugged air filter, volume air flow sensor, or the throttle body needs cleaned.

First, here are a few links that discuss how to find a vacuum leak and clean a throttle body. Also, inspect the air filter to confirm there is nothing being blocked as well as confirm nothing is disconnected between the air box and the throttle body.

https://www.2carpros.com/articles/throttle-actuator-service

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/how-to-replace-a-car-air-filter

Now, confirm the air flow meter sensor is connected and there is no corrosion on the plug.

I attached a picture of the sensor and its location. Additionally, here are the directions for testing the sensor.

INSPECTION

On Vehicle

1. Disconnect the connector from the Volume Air Flow Meter.

Air Flow Meter Connector Terminal Identification

See picture 2
2. Using an ohmmeter measure the resistance between each terminal as shown:

Between terminals E1 and FC
measuring plate fully closed .................... infinity

Between terminals VC and E2
always .................... 200 - 400 ohms

Between terminals THA and E2
at -20°C (-4°F) .................... 10 - 20 k ohms
at 0°C (32°F) .................... 4 - 7 k ohms
at 20°C (68°F) .................... 2 - 3 k ohms
at 40°C (104°F) .................... 0.9 - 1.3 k ohms
at 60°C (104°F) .................... 0.4 - 0.7 k ohms

3. If not within specifications, replace Volume Air Flow Meter.

Off Vehicle

Air Flow Meter Connector Terminal Identification

Picture 2

1. Using an ohmmeter measure the resistance between each terminal as shown:

Between terminals E1 and FC
measuring plate fully closed .................... infinity
measuring plate other than closed .................... zero

Between terminals VC and E2
always .................... 200 - 400 ohms

Between terminals THA and E2
at -20°C (-4°F) .................... 10 - 20 k ohms
at 0°C (32°F) .................... 4 - 7 k ohms
at 20°C (68°F) .................... 2 - 3 k ohms
at 40°C (104°F) .................... 0.9 - 1.3 k ohms
at 60°C (104°F) .................... 0.4 - 0.7 k ohms

Between terminals VS and E2
measuring plate fully closed .................... 200 - 600 ohms
measuring plate fully open .................... 20 - 1200 ohms

2. If not within specifications, replace Volume Air Flow Meter.

NOTE: Resistance between terminals E2 and VS will change in a wave pattern as the measuring plate slowly opens.

Here are a few links you may find helpful when testing:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know if this helps. Also, if you have other questions, let me know.

Take care,
Joe