Blown head gasket, cracked head, or cracked block.
Possibly a bad head gasket
Do a compression check on all cylinders if its realy low on one or more cylinders chances are you got a blown head gasket ( replace ) are you loosing antifreeze fluid its in your oil ?
You Don`t Need The Special Ones On This Car. Just Use The Green Color Regular One.
If you have antifreeze coming out of your oil pan you're in trouble. Knock comes from poorly combusting gas/air mixture in the cylinders. Engines need oil to lubricate the pistons moving in the cylinders and the crankshaft, gears and mechanisms controlling the valves. If you have antifreeze coming out of your oil pan, that probably means you have a cracked engine block because antifreeze circulates in the cooling system, which is supposed to be entirely separate from the oil circulating. More likely is that the antifreeze is leaking out of one of the pipes or hoses, especially at connecting points, and dribbling down the side of the engine to the oil pan at the bottom of the engine, and it just looks like it has come out there. If the engine loudly knocks all the time it may be a thrown rod.
Check the compression. that will be a far more accurate determination of whether there has been damage from overheating. If the compression is still ok across all cylinders, run a computer diagnostic test.
I'm not a mechanic / technician but if white smoke is coming out of your tailpipe with the engine warmed up it sounds like you are getting engine coolant into one or more of your engine cylinders . ( bad head gasket / warped cylinder head ) Is the coolant / antifreeze mix also going into your engine oil )
Low antifreeze, No antifreeze, Stuck thermostat, plugged up radiator, Old radiator with no more fins to disipate heat, or all the fins are plugged full of debris, Antifreeze mixture bad(too much or too much water) one or the other is no good for 200 degrees but together they work great. also if your car? has to have all the air bled out of the system to function correctly.
One gallon of antifreeze mixed with half water
It can be measured a number of ways -graduated cylinders is one way.
Cylinders 1 and 4 on are the same coil. So I would probly start by replacing the 1/4 coil, and if that doesnt solve anything, replace the ignition module next.
The type of antifreeze to use for a 2001 Mitsubishi Eclipse is one that is mixed 50/50. Most antifreeze brands will work. The Prestone brand of antifreeze is probably the most expensive.
One has six cylinders and the other has eight cylinders.