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2019 Sportage LX
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17 Posts
Discussion Starter #21
If I had to hazard a guess without seeing your car, it sounds like it may be an alternator whine which does get louder when idling or accelerating as you are putting more load on the alternator in those circumstances.
According to dealer, they tested the alternator. Of course they also said they could not hear the noise my first trip there, now they say to "run a couple of tanks of 89 octane through to see if that fixes it. Car dealers have a well deserved reputation.
 

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2018 Sportage EX
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162 Posts
If the noise doesn't change in any way that is connected to the engine RPM or road speed then you most likely are looking for something attached to the car, but nothing drivetrain related.

A vibration or bearing tick connected to a wheel would increase in frequency the faster the wheel spins.

A transmission noise on the input side would increase in frequency with engine RPM, while an output side transmission noise will increase frequency with road speed.

An engine or engine accessory making noise would increase in volume or frequency when the engine RPM speed increases.

If none of these situations are present then it's some other accessory causing the noise. Something that will run on it's own as needed.

Have you checked your electric fans? They do not run al all times and will turn on and off as needed. Be careful because electric fans have hurt more than a few people poking around an engine bay when they start suddenly.
 
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