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.
PCV System: Description
The 4-cylinder Non-Turbo crankcase ventilation system consists of an oil trap, flame guard, and PCV valve which are located in valve cover, vacuum hose to intake manifold, nipple and a hose to the air cleaner. The 4-cylinder Turbo system consists of an oil trap, PCV valve, and a vacuum hose to turbo-compressor intake.
The 6-cylinder crankcase ventilation system consists of an oil filter cap with one hose to air cleaner and a vacuum hose that divides and goes to right and left banks of the intake manifold. There is a PCV valve on each bank of the intake manifold where the vacuum hose attaches.
Crankcase ventilation system on diesel models consists of a hose from the valve cover to the hose connecting the air filter to the intake manifold. Turbo-Diesel models have a spring loaded oil separator valve in the valve cover.
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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.