chirping noise but only at highway speeds

chirping noise but only at highway speeds

Postby gordo999 [OP] » September 1st 2020, 2:15am

2001 Safari cargovan RWD

Don't know where to post this yet. Just began noticing a chirping sound (no it's not birds or a small, furry animal :D ). Don't know how to describe it yet but it sounds shrill enough to be taken seriously. It comes from the passenger side or forward area, meaning I don't really relate it to anything toward the rear. Does not show up at normal traffic speeds.

I know the sound of a worn water pump, it has a hollow howl. It's not the sound of a slipping serpentine belt. It actually has a shrill, chirping quality when it's there but it is intermittent. When it starts I get a couple of chirps then the chirps become a bit longer but never continuous. Maybe one chirp every quarter mile or so. When I get off the freeway, it's gone.

I tried revving the motor in neutral...nothing. I have considered that the air-conditioner compressor bearing may be the problem but I have it turned right off at the moment with the relay pulled. I thought of brakes, especially the little metallic parts they use to indicate a worn brake pad but it happens without the brakes applied. Besides I've heard that sound and it's not what I'd call a chirp.

There is always the wheel bearings but it sounds too chirpy for that. I guess the first thing is to get under the van to see if anything is rubbing on a turning part but this sound is not really what I am used to from metal on metal.

Don't know if something in the transmission could cause such a sound and the rear end has been rebuilt within the past couple of years with the U-joints replaced on the driveshaft.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

  • Similar topics
    Replies
    Views
    Author
  • ticking noise
    by househusband » February 15th 2021, 9:16pm in Engines
    3 Replies
    73 Views
    Last post by sixsix View the latest post
    February 15th 2021, 11:53pm
  • strange noise when driving
    by Olivier02 » February 21st 2021, 5:39am in Engines
    3 Replies
    105 Views
    Last post by Olivier02 View the latest post
    February 22nd 2021, 2:54am
  •  
    9
    23
    Last post by AstroSafari.com View the latest post
    February 25th 2021, 8:46pm

Re: chirping noise but only at highway speeds

Postby Leeann_93 » September 1st 2020, 10:17pm

Alternator bearings
'05 Astro AWD vin X
'02 Astro LS AWD vin X
'00 Astro LS AWD - WIP
'99 Safari XLE AWD - broke
'93 AWD EXT vin W - real broke
User avatar
Leeann_93
Team Leader
Team Leader
Firing on 8 Cylinders (L7)
Firing on 8 Cylinders (L7)
Years of Membership: Leeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full years
Posts: 13718
Topics: 44
Images: 17
Joined: December 2008
Location: MD
Gender: Female
Alias (AKA):
Van Model Year: 2005
Van Make/Model: Chevrolet Astro
Extra Info: LS AWD

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 1st 2020, 11:02pm

Leeann_93 wrote:Alternator bearings
Hi Leeann, thanks for response.

That's one thing I had considered but I was hoping it is not the case. I replaced the alternator a couple of years ago after another replacement failed after a year or so. The noise is what I might expect from such a bearing since I am an electrician and have worked with electric motors/alternators. Worth following up on it.

I have been thinking of running a flexible tube into the engine compartment so I can listen through it as I drive. If I poke the end near the alternator that should pick it up. Then again, I need to be careful about piercing the firewall and dealing with CO from the motor compartment.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby MechBob » September 1st 2020, 11:17pm

Rock inside the rotor moving around,intermittently rubbing in dust shield?
User avatar
MechBob
Firing on 2 Cylinders (L2)
Firing on 2 Cylinders (L2)
Years of Membership: MechBob has been a member for 2 full yearsMechBob has been a member for 2 full years
Posts: 1257
Topics: 11
Images: 12
Joined: August 2018
Gender: Male
Alias (AKA): Bob
Van Model Year: 1994
Van Make/Model: Chevrolet Astro
Extra Info: 4x4

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 2nd 2020, 5:45am

MechBob wrote:Rock inside the rotor moving around,intermittently rubbing in dust shield?
Worth pursuing but why at highway speeds only (90 kph - 100 kph = 55mph - 60 mph)?
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 4th 2020, 6:37am

Leeann_93 wrote:Alternator bearings
Leeann...checked the bearing on the alternator using a long 1/2" plastic tube. Put one end to my ear and the other over the alternator at front and rear. All I hear is rushing air, no squeal/chirping or unusual noises. There is no squeal while the van is in Park and I rev the engine quite high.

One item I forgot is the hub around which the serpentine belt is wound. I think I have changed it twice but I won't be able to get the fan shroud off till tomorrow. While the belt is off I'll take a closer look at the alternator, the hub, the water pump, and the A/C compressor.

The noise is definitely from the passenger side and I'll need to take a look at the front passenger-side wheel.

The power steering pump has crossed my mind but don't know if it would squeal while driving straight ahead. It definitely does not squeal while turning.

Have noticed the squeal at lower speeds now but it usually begins after running at freeway speeds. Very intermittent, not continuous.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby MmusicmanMmusicman is online! » September 5th 2020, 1:17am

You might have to put it in neutral while at highway speed, to determine if it's actually coming from the engine.
Are you sure it's not metal parts rubbing or vibrating, like hood hinges, body parts, or something similar? I used to get a chirp from the back of van (after being on the highway for a while).. turns out it was the rear window hatch.
Image
2000 Astro LS 4x4 | NP233 | 31" LT265/70R17 Tires | 8" LIFT | 10" TOTAL
92 Chevy Astro Cargo Shorty | V8-350
http://www.CruisinSouthFlorida.com
User avatar
MmusicmanMmusicman is online!
V8 Swap Achievement
V8 Swap Achievement
Firing on 8 Cylinders (L5)
Firing on 8 Cylinders (L5)
Years of Membership: Mmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full years
Posts: 4830
Topics: 73
Images: 49
Joined: June 2013
Location: Ft. Lauderdale, Florida
Gender: Male
Alias (AKA): Scott
Van Model Year: 2000
Van Make/Model: Chevrolet Astro
Extra Info: 2000 4x4 - 92 V8-350

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 5th 2020, 6:32am

Mmusicman wrote:You might have to put it in neutral while at highway speed, to determine if it's actually coming from the engine.
Hi MM. Been a while. Problem is the sound is so intermittent and unpredictable that I would not know when to put it i neutral. I called it a chirp because it's never sustained. Some chirps are longer than others but never more than a second or so.

Mmusicman wrote:Are you sure it's not metal parts rubbing or vibrating, like hood hinges, body parts, or something similar?
I get those sounds all the time since my van is full of stuff that vibrates and rattles. This sounds more serious, like metal on metal at high speed.

Picked up a belt tensioner today and the idler wheel that routes the belt between the alternator and the compressor. The idler wheel had a bit of play in it and so did the plastic belt wheel on the tensioner but no obvious grinding or squeaking.. Also, the tension in the tensioner spring did not seem as strong as when I last changed it. I thought both were due for a change. I'll get them in tomorrow and see if that's it.

When I got the belt off, I turned the alternator, compressor, and power steering hub. None seemed to have issues like noise or binding. I was curious about the P/S pump since that's the only one driven by the belt I have not changed. Tried to move P/S hub back and forth with belt off, seems stable.


Water pump seems OK and fan is free to run. Don't know if there's anything in fan clutch could cause that issue.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 11th 2020, 12:22am

I am not disrespecting Leeann's suggestion that the noise is due to alternator bearings. I am still considering that, however, I went into the dealer who rebuilds alternators and asked them about it. The guy tried to be honest but he thought a squealing alternator bearing would show up at low speeds as well. I don't know, maybe Leeann has had that particular experience and for me experience is far better than theory.

I noticed as I left the dealer's place, while I was driving past a long brick wall, that I could hear sharp, intermittent squeals reflecting off the wall that I cannot hear otherwise at such low speed. The other night, running down the freeway, the squeal came on and persisted for a good mile without a break. Then they stopped while I drove several miles at the same speed. The moment I got off the freeway and drove at slower speeds, I could not hear the squeal.

I am still considering MusicMan's theory about rubbing body parts. I do have various squeaks as the van moves. There is one oddity that I cannot track down. There is a very low level squeal on the alternator side after the engine warms up. It's really quiet in comparison to the squeal I hear related to the current post. Could be a slight continuous belt squeal.

Before I pulled the passenger-side front wheel the other day, I rotated it by hand. The only sound I could hear was the brake shoes dragging. Could not have been much because the wheel turned easily. No squeal. I did notice that a hunk of the curtain between the wheel well and engine compartment had broken off and was touching the wheel. I hoped that was the problem but no luck.

There was no movement when I grabbed the top and bottom of the tire and rocked it back and forth but while grabbing it on the sides and rocking there was a very slight movement. All this with the driver side tire on the ground. I have recently (2 years) replaced the ball joints, upper and lower, and the tie-rod ends.

I noticed a thin rubber hose going to an attachment on the wheel...not the brake hose. Could that be related to the ABS system and could something faulty in the ABS cause a squeal?

I plant to pull the wheel again and take the bearings out for a close up inspection. Maybe I have a roller bearing acting up in the bearing race. The noise definitely seems to be coming from the passenger side although I have been fooled by that before.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby sixsix » September 11th 2020, 1:06am

Geez, one of 'those' threads... ya know.
.

"Ban gerrymandering" out 1 side, then says, "We really need to get rid of the electoral college for starters, there is no way in hell that the person that receives fewer votes wins, simply crazy."
So only CAL, ILL & NY Elects

.
User avatar
sixsix
Firing on 6 Cylinders (L5)
Firing on 6 Cylinders (L5)
Years of Membership: sixsix has been a member for 6 full yearssixsix has been a member for 6 full yearssixsix has been a member for 6 full yearssixsix has been a member for 6 full yearssixsix has been a member for 6 full yearssixsix has been a member for 6 full years
Posts: 4679
Topics: 38
Images: 1320
Joined: May 2014
Location: Edgewood, Northern Ky.
Gender: Male
Alias (AKA): Mike
Van Model Year: 1992
Van Make/Model: Chevrolet Astro
Extra Info: LT W CPI - RWD 200K

Re: chirping noise but only at highway speeds

Postby AstroWill » September 11th 2020, 1:08am

gordo999 wrote:I thought of brakes, especially the little metallic parts they use to indicate a worn brake pad but it happens without the brakes applied. Besides I've heard that sound and it's not what I'd call a chirp.


Yea, they usually make noise when you are NOT on the brakes. Does the noise stop when you are on the brakes?

Trolls take away from productive work, best to ignore & go about your business.
Report terrorists and anyone inciting violence to FBI @ fbi.gov and 800-CALLFBI (225-5324)
User avatar
AstroWill
Technical Director
Technical Director
Firing on 8 Cylinders (L7)
Firing on 8 Cylinders (L7)
Years of Membership: AstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full yearsAstroWill has been a member for 12 full years
Posts: 11602
Topics: 108
Images: 471
Joined: February 2009
Alias (AKA): Critical Thinking+Common Sense
Van Make/Model: Chevrolet Astro
Extra Info: I love peaches

Re: chirping noise but only at highway speeds

Postby Leeann_93 » September 11th 2020, 1:19am

It was a suggestion for a place to start, not an ‘it must be that’ statement. It’s almost impossible to diagnose a noise over the internet, especially without a video/sound clip.

First thing, I’d have someone increase the idle speed while you see/hear what you can hear.
'05 Astro AWD vin X
'02 Astro LS AWD vin X
'00 Astro LS AWD - WIP
'99 Safari XLE AWD - broke
'93 AWD EXT vin W - real broke
User avatar
Leeann_93
Team Leader
Team Leader
Firing on 8 Cylinders (L7)
Firing on 8 Cylinders (L7)
Years of Membership: Leeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full yearsLeeann_93 has been a member for 12 full years
Posts: 13718
Topics: 44
Images: 17
Joined: December 2008
Location: MD
Gender: Female
Alias (AKA):
Van Model Year: 2005
Van Make/Model: Chevrolet Astro
Extra Info: LS AWD

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 11th 2020, 3:12am

AstroWill wrote:Yea, they usually make noise when you are NOT on the brakes. Does the noise stop when you are on the brakes?
Hi, AW. I'll need to check that out. I have seldom heard that sound but as I recall it's more of a hi-pitch nag than a shrill-type squeal. When I say shrill, it still does not sound critical, more something to be concerned about.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 11th 2020, 3:17am

Leeann_93 wrote:It was a suggestion for a place to start, not an ‘it must be that’ statement. It’s almost impossible to diagnose a noise over the internet, especially without a video/sound clip.

First thing, I’d have someone increase the idle speed while you see/hear what you can hear.
Hi Leeann...thanks for clarification. I will have friend working with me soon. I'll get her to rev the motor while I listen. Also, she has offered to walk beside the van to listen for chirps. If it's making that sound at low speed but not when the motor is revved, it may be related to something else, like the driveshaft.

Also, I have been focused on the front, passenger-side and maybe it's in the rear? Seen that before, almost like the van is a ventriloquist.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby MmusicmanMmusicman is online! » September 11th 2020, 1:56pm

If it's a BAD bearing... you'll soon find out which one .. :shock:
Image
2000 Astro LS 4x4 | NP233 | 31" LT265/70R17 Tires | 8" LIFT | 10" TOTAL
92 Chevy Astro Cargo Shorty | V8-350
http://www.CruisinSouthFlorida.com
User avatar
MmusicmanMmusicman is online!
V8 Swap Achievement
V8 Swap Achievement
Firing on 8 Cylinders (L5)
Firing on 8 Cylinders (L5)
Years of Membership: Mmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full yearsMmusicman has been a member for 7 full years
Posts: 4830
Topics: 73
Images: 49
Joined: June 2013
Location: Ft. Lauderdale, Florida
Gender: Male
Alias (AKA): Scott
Van Model Year: 2000
Van Make/Model: Chevrolet Astro
Extra Info: 2000 4x4 - 92 V8-350

Re: chirping noise but only at highway speeds

Postby MechBob » September 11th 2020, 5:06pm

Pull off the rotor and dump the rock out of the reluctor.
User avatar
MechBob
Firing on 2 Cylinders (L2)
Firing on 2 Cylinders (L2)
Years of Membership: MechBob has been a member for 2 full yearsMechBob has been a member for 2 full years
Posts: 1257
Topics: 11
Images: 12
Joined: August 2018
Gender: Male
Alias (AKA): Bob
Van Model Year: 1994
Van Make/Model: Chevrolet Astro
Extra Info: 4x4

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 11th 2020, 11:29pm

sixsix wrote:Geez, one of 'those' threads... ya know.
Hi 66 ... :shock:
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 11th 2020, 11:38pm

Mmusicman wrote:If it's a BAD bearing... you'll soon find out which one .. :shock:
That's what I'm thinking as one solution, run it till it burns out and hope I'm not too far from home. :D

I plan to take the doghouse out and run it down the street to see if the noise shows up from inside the cab. Have to change the rotor cap in the distributor anyway.

I recall a couple of years ago that I was getting a squeaking when I turned the drive shaft. It was at the end of the transmission housing in the little removable section at the tail end. There is a dust cap and a bearing in there but I think I changed both.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 11th 2020, 11:47pm

MechBob wrote:Pull off the rotor and dump the rock out of the reluctor.
Are we still talking alternator? Don't see any smileys so I presume you are serious or have a very dry sense of humour. The only reluctor would be in the distributor housing and no rock is going to get in there. Already listened to the front and rear bearings on the alternator with a long vinyl tube, no rock sounds, quiet as a mouse with heavy breathing issues. No noise at high RPM either.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Re: chirping noise but only at highway speeds

Postby gordo999 [OP] » September 13th 2020, 7:21am

Beginning to notice a lower level version of the squeal at low speeds. Tonight, taking a regular road home, at speeds around 60 kph, it started. I had no one following me so I waiting till the sounds started and lightly tapped the brakes. Seemed to stop it.

Just recalled that when disk brakes are installed, a lube is applied to the back of the disks to stop squealing. Will that kind of squealing occur when the brakes are not applied? Seems to me the manufacturer claimed my last set of disks did not require that lube since they were treated with something?

Anyone experienced such squealing from the disks? I have more than 3/16" still left on the pads. That's an estimate, on the outer pad only.
Original Poster [OP]
gordo999
Firing on 7 Cylinders (L1)
Firing on 7 Cylinders (L1)
Years of Membership: gordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full yearsgordo999 has been a member for 6 full years
Posts: 747
Topics: 71
Images: 5
Joined: October 2014
Gender: Male
Alias (AKA):
Van Model Year: 2001
Van Make/Model: GMC Safari
Extra Info: Cargovan 4.3 RWD

Next

 
  • Related topics
    Replies
    Views
    Last post

Return to Engines

It is currently February 25th 2021, 8:46pm

Engines Forum
Engine Repairs, Modifications, Diagnostics, Tuning, Upgrading, Questions.

<a href="https://ad.doubleclick.net/ddm/trackclk/N8334.275400VERTICALSCOPEINC./B20209277.204028354;dc_trk_aid=407011718;dc_trk_cid=94070067;dc_lat=;dc_rdid=;tag_for_child_directed_treatment="target="_blank"><img src="https://tpc.googlesyndication.com/pagead/imgad?id=CICAgKDrrqWwMRCAARgcKAEyCN4sAjjtai4k" border="0" align="right">
<IMG SRC="https://ad.doubleclick.net/ddm/trackimp/N8334.275400VERTICALSCOPEINC./B20209277.204028354;dc_trk_aid=407011718;dc_trk_cid=94070067;ord=;dc_lat=;dc_rdid=;tag_for_child_directed_treatment=?" BORDER="0" HEIGHT="1" WIDTH="1" ALT="Advertisement">
Moderator: chevy57bert
To create a new topic in Engines, click this button:
Previous topic Next topic
Recent Image Attachments
Attached by:
Ken2.7
in Engines
Views: 178
Comments: 10
Date: Yesterday
Time: 2:02am
» Read last comment
Attached by:
Attached by: Mmusicman
MmusicmanMmusicman is online!
in Engines
Views: 178
Comments: 10
Date: Feb 23 '21
Time: 8:38pm
» Read last comment
Attached by:
Attached by: Mmusicman
MmusicmanMmusicman is online!
in Engines
Views: 178
Comments: 10
Date: Feb 23 '21
Time: 8:41pm
» Read last comment
Attached by:
Attached by: WinnieVan
WinnieVanWinnieVan is online!
in Engines
Views: 178
Comments: 10
Date: Feb 23 '21
Time: 8:07am
» Read last comment
Attached by:
Ken2.7
in Engines
Views: 178
Comments: 10
Date: Feb 22 '21
Time: 11:43pm
» Read last comment
Sponsors

Who is online

Users browsing this forum: MmusicmanMmusicman is online! and 19 guests