Chevrolet Tahoe Parts And Chevrolet Tahoe Accessories
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Cut Back That Excess Oil in Your Chevrolet Tahoe
The Chevrolet Tahoe was introduced in 1995 by General Motors (GM) as a four-door, six- passenger version of the Chevrolet Blazer. The Tahoe is one of the first full-size sport utility vehicles in the market. It appealed to family-oriented buyers since it can accommodate a large family and cargo and had a powerful engine and well-equipped interior. However, the Tahoe has gotten a lot of flak for its excessive oil consumption. If you own one, chances are, you\'ll come across this problem down the road. Don\'t worry though, there are ways to fix or at least mitigate this issue.
Replace the valve cover
The Active Fuel Management (AFM) system installed in Tahoes is directly responsible for the excessive oil consumption issue that hounds its owners. According to GM, this issue could be due to oil pulled through the Positive Crankcase Ventilation system. It could also be caused by oil spray that is discharged from the AFM pressure relief valve within the crankcase. The discharged oil does not cause a problem under most driving conditions and drive cycles. However, the oil spray quantity may be more than usual under certain drive cycles (extended high engine speed operation) combined with parts at the high end of their tolerance specification. This causes inordinate deposit formation in the piston ring grooves, which then results to an increase in oil consumption and cracked or fouled spark plugs.
You would need to install an updated valve cover or reinstall a used valve cover. While doing so, you need to ensure that the baffles can hold water and do not leak. If you see any leaks, seal those leaks with RTV sealant if possible or replace the valve cover. Before you install the valve cover, make sure it is thoroughly clean and dry.
Install an AFM shield and replace pistons and rings
You would also need to install an AFM shield and clean the piston rings by soaking them in cleaning fluid for two and a half to three hours. Then, install a new oil pan gasket and ensure that the rear of the oil pan never protrudes beyond the engine block and the transmission bell housing plane. After doing this, monitor the oil consumption of your Tahoe to confirm that oil consumption has dropped to acceptable levels. If the problem persists, you may need to replace the pistons, rings, oil deflector and new lifters with new ones. As a last resort, you can have a dealer replace your engine with a new one.
Disable the AFM system
You also have the unconventional option of using a programmer to disable the AFM system of your Tahoe. There are pros and cons to this option. On one hand, it will definitely stop the excessive oil consumption of your Tahoe. On another hand, it will cause you to lose one of the features that GM products are known for.better fuel consumption. If this option appeals to you, there are several aftermarket tuners for GM vehicles that can disable the AFM system of your Tahoe.