Cold Fast Idle Too High: Prelude
- Check Idle Air Control Valve (IAC). See appropriate Diagnostic Trouble Code (DTC) in SELF-DIAGNOSTICS - PRELUDE article.
- Check Fast Idle Thermo Valve for proper operation. See SYSTEM & COMPONENT TESTING article.
- Check idle speed adjustment. See ON-VEHICLE ADJUSTMENTS article.
- Inspect/adjust throttle cable. See ON-VEHICLE ADJUSTMENTS article.
- Inspect throttle body for sticking and binding.
- Check for worn throttle body.