See Figures 1 and 2
All models covered in this guide are equipped with a positive crankcase ventilation (PCV) system. The system vents harmful combustion blow-by fumes from the crankcase into the engine air intake for burning with the fuel/air mixture. The PCV valve prevents combustion backfiring into the crankcase and serves the engine upon demand by limiting the fresh air intake. The PCV valve also controls the amount of blow-by vapors that are allowed into the intake manifold from the crankcase. The PCV valve also acts as a one-way check valve and prevents air from entering the the crankcase in the opposite direction. The PCV valve system maximizes oil cleanliness by venting moisture and corrosive fumes from the crankcase. The PCV valve system is connected with the evaporative emission system on some vehicles. Do not remove the PCV valve system from the engine. Doing so will adversely affect fuel economy and engine ventilation and may result in shortened engine life.
- Visually inspect the components of the PCV valve system. Check for loose, leaking, clogged or damaged hoses. Check for high oil consumption, rough idle or slow starting.
- Check both hoses for flow restriction or leakage. Inspect the hoses for cracks, splitting, kinking or poor grommet fit.
- Inspect the ventilation filter for excessive oil consumption.
- If a component is suspected as a cause of malfunction, replace it before proceeding. If components check out okay, proceed to component testing.
See Figure 3
- Remove the PCV valve from the grommet and shake the valve. If the valve rattles when shaken, reinstall and proceed to the next step. If it does not rattle, it is sticking and should be replaced.
- Start the engine and bring it to normal operating temperature.
- Disconnect the hose from the remote air cleaner or air outlet tube.
- Place a stiff piece of paper over the hose end and wait 1 minute. If the vacuum holds the paper in place, the system is okay. Reconnect the hose. If the paper is not held in place, the system is plugged or the Evaporative Emission Valve is leaking (if equipped). If valve is suspected of leaking, proceed to the next step.
- Disconnect the evaporative hose, if equipped and cap the connector.
- Place a stiff piece of paper over the hose end/nipple and wait 1 minute. If the vacuum holds the paper in place, proceed to the evaporative emission system testing.
- If the paper is not held in place, check the system for vacuum leaks or obstructions. Inspect the oil cap, PCV valve, hoses, grommets and valve cover for bolt tighten/gasket leak.
REMOVAL & INSTALLATION
See Figures 4 and 5
- On some engines it may be necessary to remove the air cleaner outlet tube.
- Remove the PCV valve from the mounting grommet in the valve cover.
- Disconnect the hose from the valve and remove the valve from the vehicle.
- Inspect the hoses and grommet for deterioration. Replace if necessary.
- Install a new PCV valve into the valve cover grommet.
- Attach the hose to the valve.
- If removed, install the air cleaner outlet tube.
See Figure 6
- Disconnect the PCV hose at the air cleaner by unsnapping the elbow from the retainer clip or sliding off the hose from the PCV filter adapter.
- Remove the air cleaner body top.
- Remove the ventilation filter retainer clip and filter retainer from the air cleaner body.
- Remove the filter from the retainer and clean out the retainer.
- Install a new filter into the filter retainer pack.
- Position the filter assembly into the air cleaner body with the retainer clip.
- Attach the hose to the air cleaner assembly.
- Place the air cleaner cap on the air cleaner body and secure.