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
Isuzu uses a closed type system which is designed to draw blow-by gases into the combustion chambers for reburning. Gasoline models use a baffle plate in the valve cover, regulating orifice, and connecting hoses to air cleaner and intake manifold.
Diesel models, except I-Mark Federal models, use a PCV valve assembly (containing PCV valve and oil separator), oil drain hose, and check valve. Diesel I-Mark Federal models use a PCV valve mounted on top of valve cover and connecting hose to air intake pipe.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.