The Expediton has 41K miles on it and is garage kept. The engine is the 5.4L
The whistle noise comes and goes with engine speed but remains somewhat constant unless I increase throttle position. At 70 mph the noise will go away if I drop down from overdrive to increase the engine speed.
I can't hear the wistle at idle, just under light loads from around 30 mph up to about 70. 70 mph is most bothersome, as I live close to four major freeways. Like I stated before, dropping the trans down from high (to speed up the engine) will make the noise go away, but is hard on the fuel economy.
I had checked the entire intake system for leaks or obstructions and have a new air filter.
I have been a backyard mechanic since the early sixties and never had a car problem that I could not solve, but this one is driving me crazy.
My wife drives this vehicle most of the time and is driving me crazy with her constant complaining!
Please let me know if you have more info before I take it to a Frod dealer!
Thanks for trying, but I will take it to the local Ford dealer next week. I only hope they don't use the shotgun method and replace every valve and sensor under the hood.
I never used this internet chat before, so please let me know if I owe you money for your time and effort and I will hit the accept button to pay you!
Otherwise, thanks for your input.