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Re: coolant is black in 2000 ford winstar
2 types of engine coolant one is green other is pink wrong one is used it changes color to black! witch one did you use? your vehicle may be faced with this I found 5 cars like this with this problem= wrong coolant installed!
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White smoke from the exhaust is a sign of coolant entering the combustion chamber. You say no coolant loss, or overheating. Is there a white foamy substance under the oil cap, & air bubbles escaping from the radiator? If so you have a leak and more than likely it is a blown head gasket. I would have a cooling system pressure test run. Do not continue to drive this Ford in this condition. Something is not right and you need to find out what is going on.
1989 is fuel injected, on the intake there is idle air control valve, make sure this is not dirty, also you may want to check the coolant temperature sensor, if the engine thinks it is warmer then waht it is the fuel air ratio will be off and your truck will run bad.
The codes are lean fuel condition for both banks. A very common problem with this engine that will set these codes are the upper & lower intake gaskets. You may experience a rough or rolling idle at cold start up and the condition will go away as the engine warms up. If you have checked all the basics such as vacuum leaks or air inlet leaks between the air filter box and the throttle body, then I would consider replacing these intake gaskets. Good Luck and please leave rating. Thanks