BJ. What causes GREY smoke from a diesel engine? The PCV valve has a little spring in it to resist high engine vacuum during idle, deceleration, and cruising. When your engine is running rich, you'll notice a bad PCV valve symptom, white smoke from the exhaust tailpipe, and you'll also perceive a gas smell from the smoke. If there's backfire from the crankcase, then the PCV valve is closing. Can a bad injector cause blue smoke? The valve guide is basically what the valve goes through in the head to control oil and it acts as a bushing. If you are not someone who owns or drives a diesel car and you catch blue smoke rising up from the exhaust port of your car, it could probably be because of your bad or faulty valves. So if the PCV Valve gets stuck, it will keep mixing the oil with air and other gases inside the engine. If the smoke is blue, it means it's burning oil. A very common but troublesome problem with a vehicle is when there is blue smoke coming from the exhaust. There have been many fires… The acceleration is rough. Blue smoke is a sign of burning oil. a SLIGHT oil consumption can produce whitish smoke. If it smokes all the time and worse after the engine is warmed up, that is typically due . Each engine has pistons which are move up and down a cylinder. This oil is then sucked into the combustion chamber and burned with the rest of the air-fuel mixture. If the PCV valve failed, it would essentially keep mixing the engine oil with air and gases inside the engine. Reply. You see, valves have this specific function in an engine; they open and close at specific times with the help of the Rocker . Smoke from the exhaust is either white or black or blue. Repair Valve Seals. Remove Excess Oil. Blue smoke will result when the fuel/air and oil mixture is burned. --1998 MB E300TD--1997 MB E36 AMG--2001 MB E55 AMG wagon w/ manual--2011 BMW 335d. Usually inatke manifold related or valve seals if they are in real bad shape. The LS intake floor on any of my motors was always wet with oil. White/Black/Blue Smoke from the Exhaust If the PCV valve or the hoses are blocked, the crankcase will push up oil into the combustion chambers, which will cause oil to burn inside the engine and go out through the exhaust pipe. I wasn't able to tighten mine because the nipples on the can wouldn't line up for the hoses. The consumption of oil and the leakage of oil are on the rise. 1. This may be caused by faulty injector pump and/or lift pump (which allows engine lubricating oil to mix with the diesel). The PCV valve was stuck and allowing OIL to come on in. In conjunction with, What does it mean when you have blue smoke coming out of your tailpipe? This will cause a lot of blue smoke from the exhaust pipe. A bad PCV can cause the engine to be pressurized internally, thus forcing oil out of important seals. Blue exhaust smoke only at start-up can indicate worn piston seals or damaged or worn valve guides which may also cause a rattling noise. The main component in the PCV system is the PCV valve, which is usually located in the valve cover. Click to see full answer. What causes GREY smoke from exhaust? Worn Engine Worn engine is another culprit responsible for blue smoke from exhaust. Apr 16, 2007 #3 W whitevenom99 New Member Established Member Joined Feb 14, 2007 Messages 153 Location norfolk, va Yea pretty much what Virtual said. When the PCV valve is stuck, oil mixes with air and other gases. …. Besides from being a sign of excess oil burning in your diesel engine, the smoke could also indicate: A faulty PCV (Positive Crankcase Ventilation) valve - This part is responsible for emission control. It would reappear at low engine speeds. Engine seems strong and don't think it is bad. If you somehow find out that the blue smoke is NOT coming from your piston rings, valve seals, head gasket, PCV valve, or your bad glow plugs, and you are drifting on a track with your eyes burning from blue smoke up ahead, then there's a chance the person in front of you got those fancy tires that create colored smoke when they burn up! Fix Turbocharger. Will bad PVC valve cause occasional blue smoking from exhaust? Will a bad PCV valve cause smoke on startup? If it goes away after a few minutes, it is typically due to it running past the valve guide seals into the cylinders. I'm going to try a catch can in the PCV system next. Remanufactured engine with less than 1000 miles on it. Pressure is routed into the intake manifold, so fumes can be reburned. READ MORE Can a bad diesel injector cause blue smoke? A very common problem that affects all vehicles (including the Dodge Ram) is blue smoke coming from the exhaust. Your engine's positive crankcase ventilation (PCV) valve can also be a cause of burning oil. Blue/gray exhaust smoke means there's likely an oil leak and your engine is burning oil. Because the PCV valve controls the flow of blow-by vapors from the crankcase to the intake manifold, a faulty or broken PCV valve can manifest itself in the same way as an intake air leak. When the PCV valve is stuck, oil mixes with air and other gases. This will cause a lot of blue smoke from the exhaust pipe. The valve guide is basically what the valve goes through in the head to control oil and it acts as a bushing. Mixture that is lean and rich. The smell of the smoke is not really sweet as if it was coolant. Yes, a bad exhaust gas recirculation (EGR) valve can cause blue smoke to be produced from a car's exhaust. When the PCV valve is stuck, oil mixes with air and other gases. The rubber valve seal has also cooled during nonoperation, which causes it to contract and leave a small gap. So if the PCV Valve gets stuck, it will keep mixing the oil with air and other gases inside the engine. The most common and most noticeable symptom of a bad PCV valve is a check engine light on your dashboard…. Blue exhaust smoke only at start-up can indicate worn piston seals or damaged or worn valve guides which may also cause a rattling noise. The function of the PCV valve is, releasing the pressure; (which builds up in the Oil Pan) into the intake manifold. The crankcase is the housing for the crankshaft in the engine. New PCV valve helped, but not a lot. Also, A oil leak in spark plug well, can even lead to an engine fire. A bad PCV valve are typically inexpensive, easy to access, and easy to replace. PS I'd keep an eye on your oil level to see if you can see any loss there. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure. This can cause a white/blue smoke from your tailpipe when the oil is then burned. Blue smoke is usually oil. The PCV hosing is still full of oil, and it's still burning at least 1l/1000km. This valve is responsible for releasing the pressure that builds up in the oil pan. having blue smoke sounds like antifreeze is burning so that would be the head gasket. The faulty PCV valve will either cause the mixture to be lean or rich. Blue smoke indicates that your F150's engine is burning oil. Stuck or blocked PCV valve. The end result of this is smoke coming out through the exhaust pipe. And the vehicle would emit blue smoke from the exhaust upon combustion of this mixture. Save Share. 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