It seems to have good compression but smokes and burns oil could this be a blown head gskt in the oil passage to the head.i have allways been a gm fan and have preached buy american all my life but if the top of the line gm cars can just barely out run the warranty i m having second thoughts.
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start car when engine cold - place some paper in front of exhaust pipe.
If you see dots of oil you have a major engine failure with the lower block of your engine or the rings. This costs a lot of money to fix !
I sent my car to wreckers to be crushed when I had smoke and burning oil smell plus oil when it was cold.
If it is water when engine when engine cold you may have a cracked engine head , cracked head or blown head gasket.
Less expensive to fix but may require head to be re machined if head is warped. If head is cracked then head will need welding.
A cylinder compression test will confirm this type of head problem.
1st make-sure battery end are clean ck all fuses look and see
if headlight are bright then cke charging sustem 12.5 idle
13.5 1000 rpm. Then take to auto zone and use obd2 and find
a code what color is the smoke if it white blown head gskt
burning antifreeze of blue smoke valve seals stuck rings
how often do you change oil every 3000 miles I hope this will get
you started please rly when you have more informationinformation
One potential cause is too much gas. It may be running "rich". Your car
may also be burning a little oil. White smoke is water or antifreeze. If you are loosing coolant from the
radiator, it's probably a blown head gasket. If not, it is just
condensation in the exhaust pipe that is evaporating as the pipes heat
up. If the car is running too rich, the unburned gas will cause black
smoke and burning oil smoke will be blue.
is there smoke coming out of the exhaust? if so what color? if it has white smoke is usually a blown head gasket. if it is a bluish gray it is oil. check your radiator when it is cool. if it appears to have oil in it it could be a blown head gasket. if you leave the radiator cap off start the motor, if you rev the engine and coolant shoots out of the radiator (compression from the cylinder forcing water out) it is a blown head gasket. this can cause the motor to run weak and idle rough and oil to disappear. if you happen to have a compression gauge take out all of the spark plugs look at the spark plugs if they all look the same or is there ones that look black and sooty(running rich) or looks green(burning antifreeze/water) white Burning hot) http://www.dansmc.com/spark_plugs/spark_plugs_catalog.html check the compression of each cylinder it is easier if you have an assistant for this. place the gauge over the spark plug hole crank the motor once or twice. the gauge should be around 120 psi (pounds per square inch). if all of the cylinders are under 120 psi more than likely you have worn or broken rings which will cause low compression causing it to run weak and consume oil.
There are three type's of smoke, 1 white smoke water blown head gasket. 2 black to much fuel not enough air running rich. 3 blue burning oil, check your spark plugs if fowl with oil, need to do a wet and try cylinder compression test if that check's out good, more then likely you have bad valve seal's or oil drain hole's under valve cover are clogged, remove valve cover and with long screw driver unclogged drain hole's. Hope this was very helpful, good luk
The best test is a compression test.
Blue smoke means it's burning oil, due to worn out piston rings.
White smoke means it's mixing antifreeze and oil due to a bad head gasket or cracked head or block.
well I'd say that coolant is definitely leaking into the combustion chamber, albeit at a slow rate (for now). It could be anything from a blown head gasket to a cracked block or head. I'd get it to a shop as soon as possible and not drive it any more than need be until that point.