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.
Positive Crankcase Ventilation (PCV): 2.3L
Unlike conventional crankcase ventilation systems, the 2.3L does not have a fresh air inlet to the crankcase. All blow-by gases are drawn from the crankcase through an oil/air separator. Flow is limited by a .060" (1.52 mm) orifice in the manifold intake nipple. Oil suspended in the blow-by gases is trapped in the separator and returned to the crankcase.
System uses a crankcase ventilation heater assembly to prevent icing in the system. The heating element (located inside the vent hose) consists of 2 parallel wires which extend the length of the vent hose. One wire supplies current when the ignition is on while the second wire provides a constant path to ground.
Although the wires are not physically attached, the material between the two wires is conductive. Current is passed through the material between the wires. As material is heated, resistance to current flow increases and current flow decreases. In this manner, system will maintain a temperature of approximately 115°F (46°C).
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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.