Hello, I have a faint buzzing sound when the ignition is on. It does not come on when auxiliary power is on. It is not the buzzer for leaving the key in the ignition when you open the door. It is much quieter than that. Seems like it is coming from center/under the dash but I am not positive, it is hard to tell.
Any help finding the sound is appreciated.
Regards,
Terry
Full Version: Faint buzzing sound when car running
You're sure it's not your fuel pump? That's a necessary buzz 
QUOTE(friethmiller @ Apr 29 2022, 05:47 PM) 
You're sure it's not your fuel pump? That's a necessary buzz
That’s a good question. It is not as loud as when you turn the key to cycle the fuel pump, but it is a similar sound. I replaced the fuel pump a couple thousand miles ago. I will get under the car and listen for that. That might be why I’m having trouble finding it. I don’t think it was always this loud. Could there be a resin that it would get louder?
QUOTE(tsvo @ Apr 29 2022, 04:58 PM)
QUOTE(friethmiller @ Apr 29 2022, 05:47 PM)
You're sure it's not your fuel pump? That's a necessary buzz
That’s a good question. It is not as loud as when you turn the key to cycle the fuel pump, but it is a similar sound. I replaced the fuel pump a couple thousand miles ago. I will get under the car and listen for that. That might be why I’m having trouble finding it. I don’t think it was always this loud. Could there be a resin that it would get louder?
did you get wax cleaned out of your ears?
hearing deterioration is always a serious consideration when i consider myself!
if it is the fuel pump - maybe its mounting bolts have worked loose. and its vibrating.
or - its deteriorating. assuming you have the fuel pump in front location.
check the filter. perhaps its dirty and fuel pump is fighting it.
I learned a good way to identify noises is a 3 foot piece of old garden hose.
Start car, put one end of hose on fuel pump, listen in other end.
If not, then you start moving around to areas, listen to alternator, etc etc
Start car, put one end of hose on fuel pump, listen in other end.
If not, then you start moving around to areas, listen to alternator, etc etc
QUOTE(wonkipop @ Apr 29 2022, 06:13 PM)
QUOTE(tsvo @ Apr 29 2022, 04:58 PM)
QUOTE(friethmiller @ Apr 29 2022, 05:47 PM)
You're sure it's not your fuel pump? That's a necessary buzz
That’s a good question. It is not as loud as when you turn the key to cycle the fuel pump, but it is a similar sound. I replaced the fuel pump a couple thousand miles ago. I will get under the car and listen for that. That might be why I’m having trouble finding it. I don’t think it was always this loud. Could there be a resin that it would get louder?
did you get wax cleaned out of your ears?
hearing deterioration is always a serious consideration when i consider
if it is the fuel pump - maybe its mounting bolts have worked loose. and its vibrating.
or - its deteriorating. assuming you have the fuel pump in front location.
check the filter. perhaps its dirty and fuel pump is fighting it.
I am slightly older than the car. Hearing is an increasing issue!!!!
Fuel pump is moved up front. I’ll check bolts and filter.
QUOTE(r_towle @ Apr 29 2022, 06:57 PM)
I learned a good way to identify noises is a 3 foot piece of old garden hose.
Start car, put one end of hose on fuel pump, listen in other end.
If not, then you start moving around to areas, listen to alternator, etc etc
Good idea.
Dumb question, would an alternator buzz?
Anything that moves can change tone, buzz, whir etc
You said it changes tone when a different electrical load happen.
I go for alternator, regulator etc etc
Fuel pump first.
You said it changes tone when a different electrical load happen.
I go for alternator, regulator etc etc
Fuel pump first.
Did your car come from California?
It could be the flasher relay and a slight electrical leak via the ebrake switch or the master brake cylinder switch.
Two ways to check this: one is to remove the relay and see if the buzzing stops. The other is to remove the ebrake switch wire and the MC warning switch wires and see if the buzzing goes away.
Two ways to check this: one is to remove the relay and see if the buzzing stops. The other is to remove the ebrake switch wire and the MC warning switch wires and see if the buzzing goes away.
QUOTE(r_towle @ Apr 29 2022, 07:28 PM)
Anything that moves can change tone, buzz, whir etc
You said it changes tone when a different electrical load happen.
I go for alternator, regulator etc etc
Fuel pump first.
Thanks for your input. I will start checking.
QUOTE(Front yard mechanic @ Apr 29 2022, 07:50 PM)
Did your car come from California?
Not in any recent history. Not sure long term. Why do you ask?
QUOTE(Spoke @ Apr 29 2022, 08:50 PM)
It could be the flasher relay and a slight electrical leak via the ebrake switch or the master brake cylinder switch.
Two ways to check this: one is to remove the relay and see if the buzzing stops. The other is to remove the ebrake switch wire and the MC warning switch wires and see if the buzzing goes away.
Thank you, These are great tips. I did replace the ebrake switch last summer. Maybe it is from that.
seat belt buzzer on the fuse panel?
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