Humming sound from Toyota 2007 Camry

noises

#1

I have 2007 Camry that makes a humming noise when A/C and audio are on at the same time. Pitch increases as I press on the gas pedal and decrease to a steady level as I depress on the gas pedal. What could be a cause of this phenomenon?

Thank you in advance.


#2

Have you replaced the alternator lately? What you are describing sounds like noise interference. I have seen some of the cheap alternators cause all kinds of strange issues. I would also check your electrical grounds.


#3

Agree with @SteveC76 and I will add that old spark plugs and cables can also cause this problem. BTW…it only takes one bad plug or cable to cause noise interference.


#4

Those are all good starting point. Thank you @SteveC76‌ and @missileman‌ for awesome suggestions.


#5

Alternator or coil on plug. Grounds great idea too.