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Idle Air Control Valve

Close-up of a throttle body installed in an engine bay, showing the butterfly valve and intake bore.

Throttle Body Cleaning vs. Replacement: Which Do You Need?

Decide between throttle body cleaning and replacement based on symptoms. Clean for deposit-related idle issues; replace for sensor or mechanical failures. Learn safe cleaning steps, relearn procedures, and how to choose the right part.

Idle Air Control Valve

Symptoms of a Bad Idle Air Control Valve

Can You Drive With a Bad Idle Air Control Valve? Symptoms and Fixes

Learn when a bad IAC valve makes driving unsafe, how its symptoms differ from vacuum leaks and misfires, and how to test, clean, or replace it.

Idle Air Control Valve

Mechanic holding an IAC valve near a throttle body on a workbench with tools.

P0505 Code: Idle Control System Malfunction and How to Fix It

Fix P0505 Idle Control System Malfunction with our 5-step guide. Diagnose vacuum leaks, sticky IAC valves, or throttle deposits to restore stable engine performance. Avoid unnecessary part replacements by inspecting, cleaning, and relearning idle safely.