The PCV system takes the pressure from your crankcase and safely relieves it. Valve stem seals will let oil into the combustion chamber if they are: When they go bad, oil will be allowed into the combustion chamber and there will be blue smoke. The valves in your Express’s engine are responsible for letting air and fuel into the combustion chamber, closing when the spark plug fires, and opening again to let out the exhaust. When they fail your Express will begin to burn oil and get the telltale blue smoke issue. Your Express’s piston rings further close that gap and keep oil from leaving the crankcase and finding its way to the combustion chamber. The gap between you cylinder wall and the piston is measured in hundredths of an inch. Here are some of the more common causes that your Express would start to burn oil: You’ll usually smell the burnt oil before you’ll see blue smoke from the exhaust. While exhaust never smell pleasant, it’ll have a distinct burnt smell to it. Here’s more on diagnosing oil on your spark plugs.īurning oil has its own smell. When this happens your Express is likely to start running worse and misfiring, as the spark plug will no longer be able to achieve a clean spark. If oil is slipping past the valve seals, it can make its way onto the spark plugs. This could indicate that the oil is exiting through the seals, and not through the combustion chamber. If you normally park your Express in one place, look under it and see if there is any fluid under the engine. But, a low oil level does not necessarily indicate that you are burning oil. This is very well the reason that you have come to this page. Blue smoke is proof positive that your Express is burning oil. Your exhaust will look more like a two stroke engine if it’s bad enough. It is then burned with the gasoline and tints the exhaust blue. Blue smoke indicates that oil has made its way to the combustion chamber. The most obvious and a telltale sign that your Express is burning oil is blue smoke. Here are the most common symptoms of burning oil: It’s when you are putting in a quart every 1 or 2 thousand miles that you are really consuming oil. As an engine ages, it is completely normal for it to start requiring a quart or two between oil changes. Most auto manufacturers are hesitant to tell you how much oil that they would expect their vehicles to burn. If your Chevy Express is burning oil it is typically caused by piston rings or valve guides. The engine burning oil is one of the most common problems that a vehicle can encounter, particularly one with high mileage.
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