Weird Humming Noise
#1
Driver School Candidate
Thread Starter
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I went out to my garage tonight after about 5 hours of my car not being driven. It was making an odd humming noise coming from underneath about midway down. It almost sounded like the gas purge sound that it makes when I shut it off. Any ideas? I don’t want to take it in just yet because I have no idea how to reproduce it. I turned it on and back off and the noise is gone.
#2
Pole Position
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I went out to my garage tonight after about 5 hours of my car not being driven. It was making an odd humming noise coming from underneath about midway down. It almost sounded like the gas purge sound that it makes when I shut it off. Any ideas? I don’t want to take it in just yet because I have no idea how to reproduce it. I turned it on and back off and the noise is gone.
#3
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The information below is copied from the NX300 technical training manual, and may explain your observation.
Typical set of conditions required to initiate an evaporative emission leak check:
5 hours have elapsed after engine turn-off; **
Altitude less than 2400M (8000 ft) above sea level;
Battery voltage greater than 10.5V;
Engine off;
Coolant temperature = 4.4C to 35C (40F to 95F);
Intake air temperature = 4.4C to 35C (40F to 95F).
** NOTE
If engine coolant temperature has not fallen to 35C, the elapsed time after engine turn-off is extended to 7 hours. If still not less than 35C, the elapsed time is further extended to 9.5 hours.
Typical set of conditions required to initiate an evaporative emission leak check:
5 hours have elapsed after engine turn-off; **
Altitude less than 2400M (8000 ft) above sea level;
Battery voltage greater than 10.5V;
Engine off;
Coolant temperature = 4.4C to 35C (40F to 95F);
Intake air temperature = 4.4C to 35C (40F to 95F).
** NOTE
If engine coolant temperature has not fallen to 35C, the elapsed time after engine turn-off is extended to 7 hours. If still not less than 35C, the elapsed time is further extended to 9.5 hours.
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ichitaka86
NX - 1st Gen (2015-2021)
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09-19-20 05:55 AM