3515023700 Hyundai / KIA ACTUATOR ASSY-IDLE SPEED, Price: 75.06$, Weight: 0.201kg

Idle Speed Control Actuator for Hyundai/Kia

This unit keeps your engine steady at idle, no matter if the A/C is on, steering is turning, or the alternator is loaded. It is a direct-fit piece that mounts to the throttle body and works with the engine control unit to deliver smooth, reliable idle RPM.

Why you need it

Without a healthy idle control, engines shake, stall at traffic lights, and waste fuel. Correct idle air flow also reduces emissions and protects the catalytic converter during cold starts.

How it works

The ECU pulses the actuator (stepper/solenoid) to move a pintle that meters bypass air around the throttle plate. More bypass air raises RPM; less air lowers RPM. The system continuously trims airflow to hit the target idle speed in all conditions.

What happens if it fails

Expect rough or high idle, hunting RPM, hard cold starts, stalls when shifting to Drive, poor A/C idle, increased fuel use, and a Check Engine Light (often P0505/P0506). Long-term richness can foul plugs and stress the catalyst.

Tech tips for installation ✅

• Clean throttle bore and passages; replace gasket or O-ring.
• Do not push the pintle; align carefully to avoid damage.
• Tighten mounting screws to approx. 3–4 N·m.
• After install, perform idle relearn and check for vacuum leaks.

Compatibility

• Tiburon
• Tuscani
• Coupe
• Elantra
• Avante
• Avante XD
• Lantra
• Tucson
• Trajet
• H-1
• Grand Starex