ok have a 05 zx3 2.0 i was waiting in a drive thru when i start to hear this loud humming noise then the cars turns off turn back on and the noise is gone this has happend twice so far any suggestions?
If it goes away when you give it gas (rev up) then it might be your altenator.
I just had to replace mine yesterday. I ignored it so long that it was to the point where it would heat up and start to smell toxic. That smell started coming through the vents. So run by a battery shop and have them check it out.
Alternators make humming/electrical noises before they fail completely....quite common. Check it with a stethoscope as suggested when the noise is present. It might pass a load test if you have it checked......
Never herd an alternator hum . Herd a lot of relays hum and control modules .On my 06 the fuel pump control mod is under the right rear passenger seat don’t know if yours is in the same place? If the Alt. proves good and not the problem look at the fuel pump control mod or a bad relay.