Another telltale sign is a consistently low oil level, indicating that oil is being consumed or displaced at an abnormal rate due to the constant flow from the crankcase. Oil residue around the PCV valve hose connection.
Understanding the LQ9 Oil Catch Can Rapid Fill Issue
The Risk to Critical Components If the oil-laden mixture enters the combustion chamber, it can cause carbon fouling of the spark plugs. This issue, specific to the Gen III and IV Small Block LS engines, points to elevated crankcase pressure that bypasses the standard piston rings.
Understanding why this happens is the first step in protecting the longevity of your valvetrain and bottom end. Increased oil consumption between changes.
Diagnosing Rapid Fill: Identifying Excessive Crankcase Pressure
Consistent need to empty the catch can weekly or bi-weekly. Identifying Excessive Crankcase Pressure Beyond a full catch can, there are visual indicators of pressure issues.
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