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 Infiniti M45FACTORY OEM SERVICE PROCEDURE

4. Check Vacuum Hose

Stop engine.
Check hoses and tubes between intake manifold and power valve actuator for crack, clogging, improper connection or disconnection. Refer to VACUUM HOSE DRAWING . .

OK or NG

OK: GO TO 5.
NG: Repair hoses or tubes.

Fig 1: Checking Vacuum Hoses For Damage Or Blockage

Courtesy of NISSAN MOTOR CO., U.S.A.

Factory Service Tools

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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.