The blowby vapors that land up in an engine's crankcase hold moisture and also combustion byproducts and unburned fuel vapors. The crankcase is covered to keep the leak out of these gases to the atmosphere, however the vapors need to be taken out to eliminate oil contamination that will cause sludge creation. The positive crankcase ventilation (PCV) system siphons these vapors from the crankcase and trails them into the intake manifold so as to be reburned in the engine.
The primary component in the PCV system is the PCV valve, which is typically found in the valve cover. A hose attaches the PCV valve to the intake manifold. An additional hose between the air cleaner and crankcase or another valve cover (V6 or V8 applications) gives fresh air to help purge the vapors from the crankcase. Some engines have a split air filter for the PCV breather hose positioned inside the air cleaner.
The PCV valve is a spring-loaded valve with a special hole size built to reduce the amount of air that's siphoned from the crankcase to the intake manifold. This is crucial because air drawn from the valve from the crankcase has a hovering effect on the fuel mixture virtually identical as a vacuum leak. So, air flow through the entire valve need to be regulated within certain limits. At idle, air flow is lessened because little blowby is developed. When the engine is traveling and vacuum is very high, airflow throughout the PCV valve is at a highest possible to free the blowby vapors from the crankcase.
You must be aware that PCV valves are assessed for special engine applications. A poor PCV valve for an application can pass way too much or too little air leading to drivability difficulties. Varnish remains can obstruct the valve, so replacement for protective maintenance is advisable (every 50,000 miles usually).
Don't assume all engines have PCV valves. Some ventilate the crankcase with a very little breather hose and calibrated pinhole. There's no spring-loaded PCV valve. On these particular applications, no upkeep is usually essential.
The primary component in the PCV system is the PCV valve, which is typically found in the valve cover. A hose attaches the PCV valve to the intake manifold. An additional hose between the air cleaner and crankcase or another valve cover (V6 or V8 applications) gives fresh air to help purge the vapors from the crankcase. Some engines have a split air filter for the PCV breather hose positioned inside the air cleaner.
The PCV valve is a spring-loaded valve with a special hole size built to reduce the amount of air that's siphoned from the crankcase to the intake manifold. This is crucial because air drawn from the valve from the crankcase has a hovering effect on the fuel mixture virtually identical as a vacuum leak. So, air flow through the entire valve need to be regulated within certain limits. At idle, air flow is lessened because little blowby is developed. When the engine is traveling and vacuum is very high, airflow throughout the PCV valve is at a highest possible to free the blowby vapors from the crankcase.
You must be aware that PCV valves are assessed for special engine applications. A poor PCV valve for an application can pass way too much or too little air leading to drivability difficulties. Varnish remains can obstruct the valve, so replacement for protective maintenance is advisable (every 50,000 miles usually).
Don't assume all engines have PCV valves. Some ventilate the crankcase with a very little breather hose and calibrated pinhole. There's no spring-loaded PCV valve. On these particular applications, no upkeep is usually essential.
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