How to Change an IAC on a '99 Dodge Dakota

by Robert Moore

    The 1999 model year was the second year of production for the second generation of the Dodge Dakota -- a pickup that looked much like a smaller version of its big brother, the Dodge Ram. The Dakota came with three different engines: a 2.5-liter four-cylinder, a 3.9-liter V-6 and a 5.9-liter V-8. The idle air control valve adjusts the idle by changing the amount of air entering the engine based on engine load and ambient temperature. Replacing the IAC motor is the same for all engines.

    Items you will need

    • Socket set
    • Ratchet
    • Flat-head screwdriver
    • Inch-pounds torque wrench


    Step 1

    Open the hood. Loosen the clamp that secures the air intake tube to the air filter box with a flat-head screwdriver. Follow the air tube to its connection on the throttle body and remove the top mounting nut, using a socket and ratchet. Lift the air intake tube assembly off the engine, then slide it off of the air filter box. Position the tube aside.

    Step 2

    Locate the IAC motor located in the center of the back side of the throttle body – it has a four-wire connector.

    Step 3

    Lift up on the locking tab and separate the wire harness connector from the IAC motor. Remove the IAC motor bolts and set them aside. Pull the IAC motor out of the throttle body.


    Step 1

    Compare the new IAC motor with the old one – they should be identical. Guide the IAC motor into the throttle body and install the retaining bolts. Tighten the mounting bolts to 60 inch-pounds, using and inch-pounds torque wrench and socket. Connect the wiring harness to the IAC motor.

    Step 2

    Slide the air intake tube onto the air filter housing. Set the other end of the tube onto the throttle body inlet.

    Step 3

    Install the nut to the air intake tube and throttle body stud, then tighten it to 96 inch-pounds. Tighten the band clamp at the air filter box with a flat-head screwdriver. Start the engine to verify proper operation of the IAC motor. The engine will idle high for a moment – until it enters closed loop mode – then down to about 800 rpm. Shut the hood.