My 1996 Ford Explorer AWD V-8, just started squealing/chirping (kind of loud) in the front of the engine. Sounds like its coming from inside the timing chain cover. It seems to get quieter when I rev the engine or accelerate. I originally thought it was an idler pulley or the water pump. I wish. But, I disconnected all of the accessories (where only the crankshaft was turning) started the engine and the squeal is still there. I just traveled 300 miles non-stop and then back a couple days later non-stop except for a 30 minute stop half way, and the squealing just started about half way home. The weather has also gotten much colder lately. Around 30-40 degrees. I just changed the oil and filter about 800 miles ago. I've always taken very good care of the engine and changed the oil often, etc. It has approx 106k miles on it. It seems to have good power and the oil pressure is normal. Anyone have any ideas where the squeal is coming from? Could this be the cam bearings or something related? Any help would be greatly appreciated.
Thanks
Byron