1999 windstar 3.8L; Grey green coolant doesnt smell of oil, no leaks, good oil(no coolant in oil), runs fine high idle at 1700 rpm and steam out of dip stick area when dipstick removed, oil in air intake( should i replace upper intake gaskets ? clean MAF sensor? flush coolant. there is plenty of heat and van doesnt over heat at all, lots of power any suggestions?
Sounds like an intake leak or a vacuum leak , would start it and spray like carb cleaner or starting fluid on the top of the motor while it is cool not hot and see if you get a rise or fall in rpm,s if it does get a response chase down the vacuum leak, if not it is probally the intake gasket
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I will assume as usual that it has the 5.7L engine. The common cause for a coolant leak in these truck are the intake manifold. It either leaks externally or internally or both this is a common problem with this engine. You have to replace the intake gaskets. This a fairly big job. First check your engine oil if the level has risen and if the oil smells like anti freeze or looks like a milkshake kinda foamy then the chances are good that your intake is leaking.If all else fails you will have to do a coolant pressure test and you will seee the leak probably.It could also be your cylinder head gaskets but the most likely cause is the intake gasket. $100.00 for the gasket kit and about 5-6 labour. Change your oil & filter before you start it after you replace the gaskets. Then if your leak goes away change your oil & filter again about a week later to ensure you get all the coolant out of the engine oil this is very harmfull to the bearings in the engine.
If the leaking gasket was a long term problem, the bearings may have been ready to fail. A standard procedure when replacing any gasket that has possibly been leaking anything into the engine is to do an oil change. If I read your question right, sounds like this wasn't done, if it was, then it would be hard to fault the shop. Any coolant or fuel that leaks into the oil will degrade the lubrication properties of the oil possibly to the point of metal to metal contact causing the bearings to fail.
Check you oil for signs of coolant contamination. If coolant is present in the oil, you may have a leaking head gasket or intake manifold gasket. If there is no sign of coolant in the oil, the antifreeze could be leaking past the intake gaskets and into the combustion chamber. It could also be a leak that only shows up when the engine is running, and you are losing the coolant as you drive. This kind of leak is very difficult to locate. You will have to look for signs of antifreeze around the upper and lower intake gasket area with a strong flashlight. Also check for signs of leakage at the upper and lower radiator hose connections and the drain valve at the bottom of the radiator. If you smell antifreeze inside the car, check the carpet for dampness caused by a heater core leak. Sounds like a lot of work, but these mystery leaks as I like to call them, can take repeated inspections before you finally locate them. I hope I have been of some help. Good luck and let me know what you find.
If you added three gallons of coolant you must have a leak somewhere. Those motors were notorious for intake gasket leaks. Take a good look at the corners of the intake where it meets the cylinder head. Check the oil and make sure it's not milky. Usually when the intake gasket goes it seems to leak externally but it's possible it could leak into the engine and end up in the oil pan which will prove to be disastrous if you continue to run the motor with that oil in it.
Usually intake has to do with the induction system, as in intake manifold , The intake manifold can have several types of leaks, the intake can have a vacuum leak, oil leak, coolant leak or a combination of any of the before mentioned....hope this helps,