The car smells like antifreeze when i stop at a stoplight
Everytime i start my car and let it sit for about five minutes it starts to smell like antifreeze and when i take off it dissapears but when i stop the smell comes back the car is a 2001 mercury sable 3.0 push rod engine
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White SWEET smelling smoke, or white OILY smelling smoke? If it's white thick SWEET smelling smoke, you have a blown head gasket - that's the smell of antifreeze burning in the engine, which it should NEVER do. If it's white OILY smelling smoke (smells a lot like diesel), then you're getting too much fuel into the cylinders.
If it's sweet-smelling smoke (antifreeze), pull the oil dipstick & check the oil level. If the oil level is HIGH and the oil looks like a mocha milkshake, that's absolutely conclusive - that's what happens when antifreeze gets into your oil, and it's nasty corrosive to engine parts.
I'm not at all surprised that the oil light is on if it won't start - you won't get much oil pressure until the engine is running.
Souinds like beginning of blown head gasket. could be due to corrosion on either head or block. "Diesel knock" could be due to excess compression from water in cylinder (will explain steam, antifreeze smell).
HAVE YOU NOTICED COOLANT LOSS,RECENTLY?KEEP THE COOLANT LEVELS FULL,CHECK TO SEE FOR ANY LOSS AT ALL! OIL SMOKE IS MORE BLUE THAN WHITE,BUT FUEL CAN HAVE A LIGHT BLUE SMOKE.Antifreez more whitesh with a similar smell of antifreeze.
white smoke is water blue smoke is oil. nest time try and smell the white smoke see if it smells sweet? if it does its antifreeze. and also black smoke is fuel (like a leaky injector ) hope this helps paul