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.
2004 Acura MDX BaseFACTORY OEM SERVICE PROCEDURE
PCV Valve Inspection
- Remove the intake manifold cover and the ignition coil cover (see IGNITION COIL REMOVAL/INSTALLATION ).
- Check the PCV valve (A), hoses (B), and connections for leaks or restrictions.
- At idle, listen to the PCV valve (A) with a stethoscope as you lightly pinch the PCV hose (B) with your fingers or pliers for several times. Each time the hose is pinched, the valve should click.
- If there is no clicking sound, check the PCV valve grommet for cracks or damage. If the grommet is OK, replace the PCV valve and recheck.
- Install the ignition coil cover and the intake manifold cover (see IGNITION COIL REMOVAL/INSTALLATION ).
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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