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 MANUALSCHEVROLET2007HHR L4-2.4LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSPOSITIVE CRANKCASE VENTILATIONTESTING AND INSPECTION
2007 Chevrolet HHR L4-2.4L
Positive Crankcase Ventilation: Testing and Inspection
2007 Chevrolet HHR L4-2.4LSECTION Testing and Inspection
Crankcase Ventilation System Inspection/Diagnosis
1. Remove the oil level indicator. Install a vacuum gage.
2. Start the engine.
3. Check for slight vacuum. The vacuum level should be less than 3.377 kPa (1 in Hg).
4. Block or pinch off the clean air hose. The clean air hose is the hose between the cam cover and air cleaner.
5. Vacuum should show on the gage. If held too long, vacuum will be drawn through the crankshaft seals creating a sucking sound.
6. If there is zero vacuum or pressure:
1. Verify compression of the engine.
2. If compression is normal, check for a blocked orifice at the intake manifold clean orifice.
7. If there is vacuum and a constant sucking sound around the seals, inspect the fresh air hose for a blockage.
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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.