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 MANUALSNISSAN-DATSUN2004ALTIMA S, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - 2.5LPOSITIVE CRANKCASE VENTILATIONCOMPONENT INSPECTIONPCV (POSITIVE CRANKCASE VENTILATION) VALVE

2004 Nissan-Datsun Altima S, Automatic

PCV (Positive Crankcase Ventilation) Valve

2004 Nissan-Datsun Altima S, AutomaticSECTION PCV (Positive Crankcase Ventilation) Valve

With engine running at idle, remove PCV valve from rocker cover. A properly working valve makes a hissing noise as air passes through it. A strong vacuum should be felt immediately when a finger is placed over valve inlet.

Fig 1: Checking PCV Valve Vacuum

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

RENDER: 1.0x

NO RELATED

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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.