Every 32,000 km or every 2 years.
1. On 4-cylinder models, the positive crankcase ventilation valve is located at the front of the engine, under the exhaust manifold. On 6-cylinder models, this valve is located in a rubber hose connected to a pipe at the base of the intake manifold. See Chapter 4B for details.
2. Make sure that all system components are securely fastened, properly stowed (no kinks or sharp kinks to restrict flow) and are in good condition. If wear or damage is found, replace the relevant components.
3. The positive crankcase ventilation valve is designed to release gases from the crankcase. Thus, a vacuum is created in the crankcase in most operating modes, especially at idle. Therefore, if the oil separator or forced ventilation valve is clogged, as you suspect, then they must be replaced (ch. 6). In this case, you can try to eliminate the blockage by flushing with a suitable solvent. The forced ventilation valve should rattle when shaken.
4. If an oil leak is found, disconnect the relevant pipes and hoses and check that they are not clogged.
Models with 4-cylinder engine
5. Remove the air cleaner cover, air flow meter and resonator (in the presence of). Make sure the hose from the head cover to the air cleaner is not clogged or damaged.
6. Disconnect the T-shaped rubber tube from the fitting located on the left end of the intake manifold and from the metal crankcase breather located under the ignition coil. Attach a clean rubber hose to the breather. Draw air in through the end of the hose and then blow into it. Air should flow freely in both directions.
7. In the same way, you can check the intake manifold channels. When you blow air into it, you should hear it whistling out of the bell chamber of the air duct.
8. After removing the air filter (paragraph 24) clean the housing and remove the small foam filter from the right rear corner of the housing (see fig. 25.8). If this filter is clogged with dirt or oil, it must be flushed with a suitable solvent and dried before installation.
Models with 6-cylinder engine
9. Disconnect the two breather hoses from the air duct connected to the air mass meter (see fig. 25.9). Blow out each one to check for clogging and damage.
10. Disconnect the short piece of rubber hose from the metal tube at the base of the intake manifold and check that the tube and hose are not clogged.
11. Disconnect the hose from the back of the forced ventilation valve (this hose usually has a plastic sheath) and make sure it is not clogged.
All models
12. Finally, secure all removed components securely and clean up any spilled oil.
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