steinburger56
New Member
Hello, I am new to this forum.
My 2006 Expedition 4x4 has a very difficult problem to diagnose. I am hearing a relatively loud (I'm sensitive to abnormal sounds) whistling noise coming from what I think is the engine/front area of the vehicle. The noise is only present after the vehicle has warmed up, and moving above 25mph. It continues without changing pitch or intensity until the vehicle speed drops to around 15mph. I've read about the intake manifold & idler pulley issues and their tendency to make a racket in cold weather. I just drove the SUV today in 84 degree weather. Same symptoms, wait for warm-up, above 25 noise persists, below 15, it's gone. I shift to neutral while the noise is present, and rev the engine all over. No change in pitch or intensity. I apply the brakes, parking brake too, no change. 4x4 engage, dis-engage, no change. I'm pulling out my hair now. The noise can best be described as sort of a combination of a high pitch brake squeal mixed with a wind whistle. I'm considering inducing the sound and shutting off the engine in neutral to rule out a vacuum leak of some sort, but I'm terrified of blowing a cat, or freaking out the RSC/ABS/Trac Ctrl system. Anyone have any ideas? Oh, the vehicle is bone, soccer-mom stock. Regular maintenance, 99K miles. Any help would be greatly appreciated.
Brian
P.s. A/C, HVAC on or off have no effect. Stereo on/off same thing.
My 2006 Expedition 4x4 has a very difficult problem to diagnose. I am hearing a relatively loud (I'm sensitive to abnormal sounds) whistling noise coming from what I think is the engine/front area of the vehicle. The noise is only present after the vehicle has warmed up, and moving above 25mph. It continues without changing pitch or intensity until the vehicle speed drops to around 15mph. I've read about the intake manifold & idler pulley issues and their tendency to make a racket in cold weather. I just drove the SUV today in 84 degree weather. Same symptoms, wait for warm-up, above 25 noise persists, below 15, it's gone. I shift to neutral while the noise is present, and rev the engine all over. No change in pitch or intensity. I apply the brakes, parking brake too, no change. 4x4 engage, dis-engage, no change. I'm pulling out my hair now. The noise can best be described as sort of a combination of a high pitch brake squeal mixed with a wind whistle. I'm considering inducing the sound and shutting off the engine in neutral to rule out a vacuum leak of some sort, but I'm terrified of blowing a cat, or freaking out the RSC/ABS/Trac Ctrl system. Anyone have any ideas? Oh, the vehicle is bone, soccer-mom stock. Regular maintenance, 99K miles. Any help would be greatly appreciated.
Brian
P.s. A/C, HVAC on or off have no effect. Stereo on/off same thing.