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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSPOSITIVE CRANKCASE VENTILATIONTESTING AND INSPECTION
1990 Chevrolet Lumina APV V6-191 3.1L
Positive Crankcase Ventilation: Testing and Inspection
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Testing and Inspection
This test is to see if PCV System is functioning properly.
1. Check for correct PCV valve and properly mounted PCV Valve in rubber grommet, make sure hoses & clamps are tight and in place.
2. Start engine and let idle.
3. Remove PCV valve from valve cover and place thumb over valve.
4. RPM should drop & vacuum should be felt.
5. If no vacuum is felt check for a clogged PCV. valve, hose, or intake manifold port.
6. Turn the engine off & remove the PCV. valve from hose. Shake the PCV. valve & listen for rattle. If no rattle is heard replace the valve.
RENDER: 1.0x
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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.