1. Before adjusting the minimum air rate or idle speed to specifications, make sure the idle air control valve pintle is fully extended or bottomed out in it's seat. This will prevent the use of a special IAC valve tool to block off the air passage.
2. Remove air cleaner, then remove idle screw concealment plug. (Refer to CONCEALMENT PLUG REMOVAL under COMPONENT REPLACEMENT.)
3. Warm engine to normal operating temperature, and connect a tachometer.
4. With the IAC valve connected, ground the diagnostic "test" terminal in ALDL connector. (Connect jumper between terminals "A" and "B".)
5. Turn ignition "ON", but do not start engine. Wait at least 30 seconds to allow the IAC pintle to fully seat, closing the air passage.
6. With ignition "ON", engine stopped and diagnostic lead grounded, disconnect the IAC valve electrical connector.
7. Remove ground from the ALDL connector and start the engine. Allow the engine speed to stabilize.
8. Adjust the idle stop screw to specifications. (See SPECIFICATIONS SECTION.)
9. Turn ignition "OFF" and reconnect the IAC connector.
10. Start engine and run at 2000 RPM for ten seconds to reset the idle air control valve pintle position. Turn ignition off.
11. Cover idle stop screw with silicone or similar sealant.
12. Remove test instruments and reinstall air cleaner.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Minimum Air Rate - Fuel Injection Only

Use the Manual With the Right Hardware

When to See a Mechanic

Rather have a pro handle this?