Description
A crankcase ventilation system is used to consume crankcase vapors in the combustion process, instead of venting them into the atmosphere. Fresh filtered air from the intake duct is supplied to the crankcase, mixed with blow-by gasses, and the passed through a calibrated orifice into the intake manifold.
Step | Action | Yes | No | ||||||||||||||||||
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DEFINITION: The following items are the result of incorrect operation: A plugged or restricted ventilation system may cause the following conditions:
A leaking crankcase ventilation system may cause the following conditions:
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1 | Does the vehicle exhibit any of the following conditions?
| Go to Step 2 | System OK | ||||||||||||||||||
2 | Inspect the crankcase ventilation system hoses for kinks and broken or disconnected fittings. Did you find any kinked or damaged hoses? | Go to Step 3 | Go to Step 4 | ||||||||||||||||||
3 |
Did you correct the condition? | System OK | Go to Step 4 | ||||||||||||||||||
4 | Check the metering orifice for blockage. Is the orifice blocked? | Go to Step 5 | Go to Step 6 | ||||||||||||||||||
5 | Repair the blockage of the metering orifice. Did you correct the condition? | System OK | Go to Step 6 | ||||||||||||||||||
6 | Inspect the valve cover seals and oil pan gasket for leaks. Did you find any leaks? | Go to Step 7 | Go to Step 8 | ||||||||||||||||||
7 | Repair the gasket and seal leaks as needed. Did you correct the condition? | System OK | Go to Step 8 | ||||||||||||||||||
8 | Inspect for blocked passages in the throttle body connections. Did you find any blocked passages? | Go to Step 9 | |||||||||||||||||||
9 | Clean blocked throttle body passages. Did you correct the condition? | System OK | |||||||||||||||||||
