Cold Fast Idle Too High
- Check idle speed adjustment. See ADJUSTMENTS article.
- Inspect/adjust throttle cable. See ADJUSTMENTS article.
- Inspect throttle body for sticking and binding.
- Check for worn throttle body.
- Check Idle Air Control Valve (IAC). See Diagnostic Trouble Code (DTC) in TESTS W/CODES - INTRODUCTION article.
- Check Intake Air Temperature (IAT) sensor circuit. See Diagnostic Trouble Code (DTC) in TESTS W/CODES - INTRODUCTION article.
- Check Fast Idle Thermo Valve for proper operation. See SYSTEM/COMPONENT TESTS article