Question about Cars & Trucks
That will happen when oil evaporates on a hot exhaust
to stop it , repair the oil leak
Posted on Sep 16, 2017
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Posted on Jan 02, 2017
on the 3.8 ussaualy not the head gasket but the upper intake gasket . antifreeze leaks inside intake and into the cylinder. very common. the new gaskets are much thicker.or the plastic plenum the black plastic part on top of the engine goes bad around the water inlet and need to be replaced . when i do either job itell the person to replace both at same time saves money and headaches in the near future. hopes this helps .....and cost for a shop to do this $1100 to $1500
Posted on Dec 08, 2008
SOURCE: oil leak
On my 97 OBW their was a kidney shaped plastic plate, just to the right of the rear crank seal on the back of the engine. The seal is known to fail. some people buy a new metal one, I just resealed mine with a good sealer. I had my engine out doing the heads, so I also replaced the crank seal. My fathers Outback had the same leak. if its leaking more to the passenger side right under the bell housing you can pretty much make a bet thats it.
Posted on Jan 27, 2009
SOURCE: coolant leak
More than likely it is coming from the intake manifold. You can use a pressure tester that hooks to the radiator and use a flashlight and mirror to get a better look at where it is coming from.
Posted on Apr 02, 2009
White smoke is indicative of a leaking head gasket or cracked head.
The liquid enters the combustion chamber and is ignited with the gas - and the exhaust is water vapors.
(unless you drove through a puddle that splashed watyer onto the exhaust)
The head gasket/cracked head is most evident on startup.
If your coolant level goes down with no visible leaks - your problem is internal (head gasket failure or cracked cylinder head).
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Posted on Apr 26, 2009
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Nov 17, 2016 | Cars & Trucks
Jan 17, 2015 | Cars & Trucks
The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. This is most frequently seen in older or high mileage cars with worn seals and gaskets. It only requires a very small amount of oil leaking into the cylinders to cause excessive blue exhaust smoke.
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. An external engine oil leak can drip onto hot engine and exhaust parts causing what appears to be blue exhaust smoke. 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.
Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. In addition, a reduction in power and oil loss can be indicators that the blue exhaust smoke is caused by an internal engine oil leak. Internal engine oil leaks can also allow fuel to mix with the oil in the crankcase which will degrade the oil and prevent it from adequately protecting the engine.
Operating a car with a severely dirty oil filter, air filter or improperly functioning PCV valve can also sometimes result in engine oil blow-by, oil loss and blue exhaust smoke. Periodically checking the engine oil level with the oil dip stick will indicate if there is excessive oil consumption. Higher viscosity engine oil can sometimes temporarily reduce the amount of blow-by; however, this is not generally recommended. Excessive blue exhaust smoke indicates a possible internal engine oil leak that should be inspected by an ASE certified mechanic.
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