The only model to use a PCV valve is the Van. To reduce the hydrocarbon emissions, crankcase blow-by gas is routed through the PCV valve to the intake manifold for combustion in the cylinders. On the Cressida models, to reduce hydrocarbons emissions, crankcase blow-by gas is routed through two metering orifices to the intake manifold for combustion in the cylinders.
The function of the PCV valve is to purge the crankcase of harmful vapors through a system using engine vacuum to draw fresh air through the crankcase. It reburns crankcase vapors, rather than exhausting. Proper operation of the PCV valve depends on a sealed engine.
Engine operating conditions that would indicate a malfunctioning PCV system are rough idle, oil present in the air cleaner, oil leaks or excessive oil sludging.
The simplest check for the PCV valve is to remove it from its rubber hose and shake it. If it rattles, it is functioning. If not, replace it. In any event, it should be replaced at the recommended interval whether it rattles or not. While your at it, check the PCV hoses for breaks or restrictions. As necessary, the hoses should also be replaced.
The positive crankcase vent valve (PCV) should be replaced every 30,000 miles or 24 months. (California models, every 60,000 miles).
REMOVAL & INSTALLATION
- Pull the valve, with the hose still attached to the valve, from its rubber grommet.
- Use a pair of pliers to release the hose clamp, remove the PCV valve from the hose.
- Install the new valve into the hose, slide the clamp into position, and install the valve into the rubber grommet.