If you have white smoke coming out of exhaust, you probably have a problem worse then too big of fuel injectors for your pcm tune. White smoke out the exhaust is sign of coolant getting into the combustion chamber. Usually from a blown head gasket, but sometimes from cracked heads or block. DON'T RUN YOUR CAR ANYMORE. The antifreeze can ruin your main and rod bearings in a heartbeat if you continue to run engine and it contacts the bearings, it does this by oil and coolant mixing. So check your dipstick for oil contamination. You'll know it right off by the chocolate milk you see on the dipstick. Pull your spark plugs and look at them. The one or ones in cylinders that are pumping coolant will be washed clean, while the normal cylinders will have a normal appearance of plugs.
Even if you don't have coolant and oil mixing, you can still have a blown head gasket. Sometimes you get lucky and all the water blows right out the exhaust pipe rather than mixing with the oil.
I would drain the coolant, flush it out with water and leave it empty until you get the problem solved. That way you won't ruin the bearings, if they aren't already toast. That's if you have coolant mixing with the oil.
A compression test can diagnose blown head gasket. Either there will be 1 or more cylinders with low compression, or 2 cylinders next to each other with low compression. Disable the ignition system so engine doesn't fire.
If you have milky oil, change oil and filter immediately. Remmber, don't run engine until you fix the problem
Last edited by cocobolo95; 11-11-2012 at 06:39 AM.