Question about Subaru Forester
First, you need to figure out what caused the problem in the first
place, because just replacing parts won't prevent the problem from
returning later. Do you know which of the two heads is the problem? Buy a Haynes manual from a local auto parts store and get busy!!! There is probably a lot of room
under the hood of your Forester to work with. Start with a good
shampooing of the engine compartment at a do-it-yourself car wash. Has
your engine ever been overheated?? Usually an overheat will cause a
head gasket to go bad because of a faulty fan switch or temp sensor.
There is a product at most of the large chain auto parts stores that
can reseal a leaking head gasket without removing the head. You should
be using only Subaru anti-freeze in this car, as the regular "green"
stuff used in most American cars is too caustic to aluminum parts and
may be the cause of your leaking head gasket. I've seen Japanese heads
that look like Swiss cheese because the owner used improper coolant. I
wouldn't change the head gasket unless you were totally sure that
nothing else would help, but you can do it yourself if you are
determined enough but you are going to have to pull the engine to get the head gasket replaced and you should just change both since you will have it out anyway. The reason it is such a pain to and you have to do this is because it is a boxer engine and the
heads are up almost against the wheel wells. Again, the haynes manual will save you if you decide to do this as it will have full instructions with pictures on how to do this. You are going to need a lot of tools that you probably don't have that could run you up to $1000, so it is your choice how you want to proceed. A Subaru properly maintained should last for 250,000
miles or more, with proper attention but then again this car is known to have its problems. Let me know how this turns out.
Posted on Jul 25, 2009
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Posted on Jan 02, 2017
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Nov 19, 2016 | 2005 Dodge Neon
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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