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.
Possible Causes
2004 Acura 3.5RLSECTION Possible Causes
An idle control system malfunction can be caused by:
- Idle Air Control (IAC) valve mechanical malfunction.
- IAC thermal valve malfunction.
- Throttle body clogged port or improper adjustment.
- Intake manifold gasket leak.
- Intake air hose loose and/or leaking.
- Vacuum hose leaks.
- Incorrect ECT sensor output signal.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.