Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA2001INTEGRA GS, 2D COUPE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM & COMPONENT TESTINGIDLE CONTROL SYSTEMFAST IDLE THERMO VALVE3.5RL
2001 Acura Integra GS, 2D Coupe, Standard
Fast Idle THERMO Valve: 3.5RL
2001 Acura Integra GS, 2D Coupe, StandardSECTION 3.5RL
NOTE:
Fast idle thermo valve may also be called, idle air control (IAC) thermo valve.
- Remove fast idle thermo valve cover. Ensure engine coolant temperature is less than 86°F (30°C). Start engine and allow to idle. Place finger over valve seat area. See Fig 1 . If airflow is present at valve seat area, go to next step. If airflow is not present, replace fast idle thermo valve and recheck for symptom.
- Start engine and run at 3000 RPM, with no loads and transmission in Park or Neutral, until radiator fan comes on. Allow engine to idle. Fast idle thermo valve should be completely closed. Place finger on valve seat area. If vacuum is felt, fast idle thermo valve is leaking. Ensure engine coolant level is correct and cooling system is free of air. If okay, replace fast idle thermo valve and recheck for symptom.
NOTE:
If fast idle thermo valve cover was removed, perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.5RL article.
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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.