LOVE ETCG .. been watching and learning and enjoying for years. I’m up against a strange one here for sure.
It’s a 2012 Lincoln Navigator with about 220k miles on it. Recently it has developed the strangest noise coming from the engine compartment. It sounds like a distant siren and the sound is clearly associated with engine RPM. The noise generally starts around 900 / 1000 RPM and will continue through about 2,000 RPM and it goes away above 2k rpm. What makes the sound so bizarre is that it sounds like the sound is “changing gears.” Oh .. by the way, this is with the vehicle stationary (in park or neutral). As you slowly accelerate from 1k -2k RPM, the pitch of the sound will start low and increase to a point, then it will “change gears” and the pitch will return to the lower end and slowly rise again. It will go through this cycle multiple times while slowly and steadily increasing RPM from 900 – 1k RPM.
There are no maintenance light of CEL’s on. There are no unusual indicators, gauges all look normal, driveability is excellent and there are no other indications that there is something awry.
The only thing I’ve noticed recently is that my coolant levels were a little low. I’ve topped it off, but so far the noise persists.
Here is a video doing my best to capture the sound. It’s hard to tell because there is so much engine / fan noise but the engine RPM is slowly increasing from idle – 2k rpm
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