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Persistent, constant, high-pitched tone #4781991
06/09/18 08:20 AM
06/09/18 08:20 AM
Joined: Sep 2012
Posts: 27
Pennsylvania
FriboRage Offline OP
FriboRage  Offline OP

Joined: Sep 2012
Posts: 27
Pennsylvania
Iím just looking to pick some brains and see if someone more knowledgeable than me can provide some direction.

Iíve got this high pitched tone, itís like (beeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeep) but constant, thereís no start and stop. Itís almost like an audio whine if you have power wires too close with speaker wires. Sometimes it borders on a buzzing, but itís always closer to the beep. Itís unchanging and independent of engine speed or load.

At first I thought it was an audio issue, but itís most audible under the car and with all the doors and windows closed, though itís also very noticeable inside the car. I settled on a fuel pump since itís so loud under the car, changed the pump with a brand new oem ac delco pump. Still there... though at 14 years old and 150k it probably could use the pump anyway. Iím going to change the fuel filter today.

It happens at key on and goes for about 2-3 seconds, then stops forever until I start the car.. then itís constant. Thatís the main reason I went with fuel pump.

So now Iím trying to figure out whatís happening. I only had 1 DTC that I cleared and never came back... P1811, max adapt long shift. Can the noise be the tranny fluid pump?

I havenít had a chance to check the fluid level, Iím planning to change the fluid and filter today since itís been a few years.

Last edited by FriboRage; 06/09/18 08:24 AM.
Re: Persistent, constant, high-pitched tone [Re: FriboRage] #4781997
06/09/18 08:25 AM
06/09/18 08:25 AM
Joined: May 2012
Posts: 1,406
Georgia
AVB Offline
AVB  Offline

Joined: May 2012
Posts: 1,406
Georgia
That is normal fuel pump noise.

Re: Persistent, constant, high-pitched tone [Re: FriboRage] #4782000
06/09/18 08:28 AM
06/09/18 08:28 AM
Joined: Sep 2012
Posts: 27
Pennsylvania
FriboRage Offline OP
FriboRage  Offline OP

Joined: Sep 2012
Posts: 27
Pennsylvania
It canít be, itís ear-piercing... I know the pump whines at key-on and while running but thats more like a hum.

Even my girlfriend who knows nothing about cars was like, what is that horrible noise... after riding in this car for 10 years.

Unless the fuel filter is blocked up somehow and the pump is straining way harder than it should... in which case Iím changing that filter today so Iíll find out.

Last edited by FriboRage; 06/09/18 08:34 AM.
Re: Persistent, constant, high-pitched tone [Re: FriboRage] #4782011
06/09/18 08:39 AM
06/09/18 08:39 AM
Joined: May 2010
Posts: 9,846
out there
spasm3 Offline
spasm3  Offline

Joined: May 2010
Posts: 9,846
out there
See if there is a fuse for the fuel pump, pull it and see if the sound goes away. If it does wink. If it goes away, i'd change the fuel filter first and see if there is any change, then the fuel pump.


13 elantra 75k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 9500 miles m1 0w30
Re: Persistent, constant, high-pitched tone [Re: FriboRage] #4782012
06/09/18 08:39 AM
06/09/18 08:39 AM
Joined: Jun 2003
Posts: 34,068
ME
eljefino Offline
eljefino  Offline

Joined: Jun 2003
Posts: 34,068
ME
Whack the bottom of the tank with a 2x4 and try throwing some 2-stroke oil in.

It might be some other gadget related to the fuel system like a regulator or some EVAP thing.

Re: Persistent, constant, high-pitched tone [Re: FriboRage] #4782014
06/09/18 08:44 AM
06/09/18 08:44 AM
Joined: May 2012
Posts: 1,406
Georgia
AVB Offline
AVB  Offline

Joined: May 2012
Posts: 1,406
Georgia
Try the filter, I always replace the filter when I install a new pump. I believe that is a requirement for the pump warranty.

Re: Persistent, constant, high-pitched tone [Re: FriboRage] #4782024
06/09/18 08:55 AM
06/09/18 08:55 AM
Joined: Mar 2014
Posts: 3,794
NJ
Leo99 Offline
Leo99  Offline

Joined: Mar 2014
Posts: 3,794
NJ
Maybe pull some fuses and see if the sound stops.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles (RIP)
2004 Corolla 125,000 miles
2004 Rav4 370,000 miles
2015 Camry 70,000 miles
Re: Persistent, constant, high-pitched tone [Re: FriboRage] #4782044
06/09/18 09:14 AM
06/09/18 09:14 AM
Joined: Jan 2015
Posts: 972
missouri
ragtoplvr Offline
ragtoplvr  Offline

Joined: Jan 2015
Posts: 972
missouri
1.. fuel filter. Most auto fuel pumps have brushes. the pumped gas flows over the pump motor to cool it and lube it. So 100% of the brush wear, copper and bearing wear end up in the filter. Always change it.

2. Check to see if some of the isolator rubber for the tank mounting and things around it have deteriorated. I suspect that some noise isolation rubber is gone somewhere.

Rod

Last edited by ragtoplvr; 06/09/18 09:20 AM.
Re: Persistent, constant, high-pitched tone [Re: FriboRage] #4782269
06/09/18 01:57 PM
06/09/18 01:57 PM
Joined: Dec 2017
Posts: 1,719
US
JLTD Online shocked
JLTD  Online Shocked

Joined: Dec 2017
Posts: 1,719
US
Telling us what car you have might be really helpful.


I use the overseas owner's manual to choose my oil.

Using AMSOIL‚ĄĘ

Hers: 2008 Jeep Liberty 138k, SS 5w30/Amsoil

His: 2015 4Runner 45k, OE 5w30/Wix

Re: Persistent, constant, high-pitched tone [Re: FriboRage] #4782926
06/10/18 10:01 AM
06/10/18 10:01 AM
Joined: Sep 2012
Posts: 27
Pennsylvania
FriboRage Offline OP
FriboRage  Offline OP

Joined: Sep 2012
Posts: 27
Pennsylvania
Sorry, itís a 2004 Grand Prix GTP. Iím used to posting on a forum where my car is in a signature.. I donít have that set up here.

Anyways, I did the fuel filter and itís 200% better. Not only is the noise gone, but itís dead silent... not even a quiet whine or hum. Better than before the problem started!

Thanks everyone for your input!

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