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If you car is overheating often and white smoke come out the tail pipe when running, good chance it is. Easiest way it to check is the fluid in the radiator - look for oil floating on the top. If your cooling reservoir (off white container connected by a smaller black hose to the radiator) has fluid in it, check it or you can open the radiator cap (only when the engine is cool - hasn't been running - don't touch it until it's sat for a few hours if you used it) and use a turkey baster or similar to pull some fluid out. If you see some oil floating, it's most likely a head gasket.
Sounds like a compression ring in one of your cylinders has broken and compression is being pushed into oil pan. Cylinder compression getting past the piston, instead of going out the exhaust it's going into oil pan and coming through engine (dipstick, air cleaner, PCV.) You'll need to have a compression test to confirm.
Two choice: 1. Inspect the Head Gasket; Cause: head gasket leaking coolant into cylinders 2. inspect the Engine; Cause: Cracked block leaking coolant into cylinders. Coolant is not a flammable liquid, therefore a lot of coolant in cylinder creates starting problem. You should check your engine and the coolant system for this issue.
The first thing you can do is check the oil dipstick - you're looking
for a milky brown color as opposed to a dark brown (normal) color for
oil - unless you've recently had an oil change - then it will be like
honey. If you don't see any discoloration - I would then look around
the the bottom of the area where the valve covers are located - the
valve covers sit atop the heads and if you have a "blown" head gasket -
you may see evidence of water/coolant seepage. You can also take the
vehicle to a mechanic, who can do a simple test using air pressure to
isolate a potential gasket issue.
Wire on oil sending unit may have fallen off or sensor itself may have gone bad. Check both. If engine has no tapping noises, likely it's not a pressure problem.
Never seen oil come from tail pipe (unless a piston has a broken ring or a hole burned in it.) Cooling sensor tells the computer the engine temp and the computer turns the fan on through the fan relay. Very important for it to work. A blown head gasket will make the engine overheat, can cause white smoke from tailpipe, coolant loss and extremely rough running. Also can cause coolant in engine oil or oil in radiator. What you may be seeing may be water mixed with carbon from the inside of the pipe. Excessive water coming form pipe is also a head gasket symptom. A compression test or cylinder leakdown test or a radiator hydrocarbon test will tell you if gasket has failed.
When you do a cylinder leak down test you need to find out where the air is leaking from. as air is going in listen at the tail pipe, the intake the and the oil cap. out the the tail pipe you have a bent exhaust valve, out the intake you bent the intake valves, out the oil cap you need new rings. You need to have that cylinder on top dead center of compression stroke. Hope this helps you
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