Chirping Sound
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,032
Likes: 4
From: Houston Tx
St. Jude Donor '06
Chirping Sound
Hi,
Just curious. I have my car in the shop right now for the Tube Torque Drive Shaft problem and while it is in I asked them to look into the chirping sound I have while in Sport or Track Mode (NPP) when the car switches from 8cy to 4cy. I know I have seen posts where several of you have experienced the same problem. Has anyone actually had this serviced and if so what was the solution? My service department is saying they cannot reproduce the sound which is ridiculous, I have it all day everyday. If I have to I will go down there and show them, just wanted to know if anyone knew the fix for this. Thanks so much.
Just curious. I have my car in the shop right now for the Tube Torque Drive Shaft problem and while it is in I asked them to look into the chirping sound I have while in Sport or Track Mode (NPP) when the car switches from 8cy to 4cy. I know I have seen posts where several of you have experienced the same problem. Has anyone actually had this serviced and if so what was the solution? My service department is saying they cannot reproduce the sound which is ridiculous, I have it all day everyday. If I have to I will go down there and show them, just wanted to know if anyone knew the fix for this. Thanks so much.
Le Mans Master
Joined: Oct 2004
Posts: 8,615
Likes: 60
From: Haymarket Virginia
My car started to do that around 1500 miles, took it to the dealership and the dealership as well as a GM Engineer said it was "normal" Yes, you read it right, normal...
Than again the GM Engineer said that Orange Peel on the paint is part of the design as well as a rattle I have in the back is normal due to the NPP exhaust.
Good Luck, let me know how the address the squeak.
Than again the GM Engineer said that Orange Peel on the paint is part of the design as well as a rattle I have in the back is normal due to the NPP exhaust.
Good Luck, let me know how the address the squeak.
Pro
Joined: Oct 2013
Posts: 536
Likes: 2
If it's one chirp each time it changes from 8 to 4 or 4 to 8, it sounds like the valves in the exhaust system opening and closing might be it.
Have them check both sets. If I'm remembering correctly, the best solution was a spray on lubricant
Have them check both sets. If I'm remembering correctly, the best solution was a spray on lubricant
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,032
Likes: 4
From: Houston Tx
St. Jude Donor '06
I would say it definitely is the baffles, and I had read somewhere that someone said they just needed a lubricant, but when I suggested that to the service guy he said that at the high heat in the mufflers the lubricant wouldn't last long. I just wondered if anyone has had this serviced yet and if so what their solution was.
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,032
Likes: 4
From: Houston Tx
St. Jude Donor '06
My car started to do that around 1500 miles, took it to the dealership and the dealership as well as a GM Engineer said it was "normal" Yes, you read it right, normal...
Than again the GM Engineer said that Orange Peel on the paint is part of the design as well as a rattle I have in the back is normal due to the NPP exhaust.
Good Luck, let me know how the address the squeak.
Than again the GM Engineer said that Orange Peel on the paint is part of the design as well as a rattle I have in the back is normal due to the NPP exhaust.
Good Luck, let me know how the address the squeak.
Also if it was normal it would be happening to everyone not just some. Watch for that rattle. I had it at first and attributed it to the NPP but it turned out to be the driveshaft instead. I will let you know what they find in the chirp, but my guess is I am going to get the same answer as you since they are trying to say they cannot duplicate it. Don't you just love when a problem they don't have an answer for becomes "normal". The baffles are probably too large and the only fix is a redesign and replacement of the NPP. Crazy.
Le Mans Master
Joined: Oct 2004
Posts: 8,615
Likes: 60
From: Haymarket Virginia
Wow, you are kidding, they said it was normal. Ridiculous. It completely takes away from the grumble of the mufflers to end with a chirp Also if it was normal it would be happening to everyone not just some. Watch for that rattle. I had it at first and attributed it to the NPP but it turned out to be the driveshaft instead. I will let you know what they find in the chirp, but my guess is I am going to get the same answer as you since they are trying to say they cannot duplicate it. Don't you just love when a problem they don't have an answer for becomes "normal". The baffles are probably too large and the only fix is a redesign and replacement of the NPP. Crazy.
Also if it was normal it would be happening to everyone not just some. Watch for that rattle. I had it at first and attributed it to the NPP but it turned out to be the driveshaft instead. I will let you know what they find in the chirp, but my guess is I am going to get the same answer as you since they are trying to say they cannot duplicate it. Don't you just love when a problem they don't have an answer for becomes "normal". The baffles are probably too large and the only fix is a redesign and replacement of the NPP. Crazy.
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,032
Likes: 4
From: Houston Tx
St. Jude Donor '06
My chirp (squeak) usually can be duplicated by switching from Sport to Touring but wouldn't you know it, I couldn't get it to chirp that way when I was there. I will let you know the outcome. Thanks.
Le Mans Master
Joined: Oct 2004
Posts: 8,615
Likes: 60
From: Haymarket Virginia
I was able to duplicate mine every time and all they could say is that it's normal. It's more pronounced when it's cold outside with my car.
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Racer
Joined: Mar 2013
Posts: 287
Likes: 2
From: Salina Kansas
Hi,
Just curious. I have my car in the shop right now for the Tube Torque Drive Shaft problem and while it is in I asked them to look into the chirping sound I have while in Sport or Track Mode (NPP) when the car switches from 8cy to 4cy. I know I have seen posts where several of you have experienced the same problem. Has anyone actually had this serviced and if so what was the solution? My service department is saying they cannot reproduce the sound which is ridiculous, I have it all day everyday. If I have to I will go down there and show them, just wanted to know if anyone knew the fix for this. Thanks so much.
Just curious. I have my car in the shop right now for the Tube Torque Drive Shaft problem and while it is in I asked them to look into the chirping sound I have while in Sport or Track Mode (NPP) when the car switches from 8cy to 4cy. I know I have seen posts where several of you have experienced the same problem. Has anyone actually had this serviced and if so what was the solution? My service department is saying they cannot reproduce the sound which is ridiculous, I have it all day everyday. If I have to I will go down there and show them, just wanted to know if anyone knew the fix for this. Thanks so much.
However, I also have a faint chirp or squeak that can be heard mostly at city speeds on straight flat surfaces. I'm thinking it the NPP baffles opening and closing, but have not had it checked out.
Le Mans Master
Joined: Oct 2004
Posts: 8,615
Likes: 60
From: Haymarket Virginia
I didn't know that the C7 would change to 4cy in Sport or Track Mode? My 7 speed only goes to 4cy in Economy Mode.
However, I also have a faint chirp or squeak that can be heard mostly at city speeds on straight flat surfaces. I'm thinking it the NPP baffles opening and closing, but have not had it checked out.
However, I also have a faint chirp or squeak that can be heard mostly at city speeds on straight flat surfaces. I'm thinking it the NPP baffles opening and closing, but have not had it checked out.
Does your exhaust quiet down or get louder when you hear the squeak?
Racer
Joined: Mar 2013
Posts: 287
Likes: 2
From: Salina Kansas
That's a good question. I have my NPP set to open (loud) all the time. However, it still goes into quiet mode during steady city driving at speeds up to 45 mph. I only hear the squeak when the exhaust is quiet and it can happen even on smooth road surfaces.
Advanced
Joined: Aug 2014
Posts: 71
Likes: 1
SO GLAD I found this thread among others pointing to same problem/solution (temp fix as it were). I started hearing the chirp/squeak and thought it was my 4th gear, until I had it happen in 5th and 6th. Of course as soon as you hit the clutch it goes from v4 to v8 and anything over 4th it moves those baffles. It all added up. I did a temp wd40 and just tried to duplicate and it's gone.
Has anyone found a long/longer term solution?
thanks
Has anyone found a long/longer term solution?
thanks
Intermediate
Joined: Mar 2013
Posts: 30
Likes: 0
From: Reading PA
Mine does the exact same thing. Took it to the dealer and told them they can duplicate it by turning it from tour to sport. They heard it and told me the noise is normal. They also told me it only happens when it changes from tour to sport. I told them no, it happens every time I slow down to a stop and the baffles open back up. I get the chirp when switching from tour to sport, so figured it is the back valves. I verified the sound was the back valves by having my wife switch from tour to sport as I was behind it listening. I turned my auto sound off, figuring that would keep the back valves open, but they still must close and open because I still get the chirp, when slowing down to a stop and the engine switches from V4 to V8 (I have an automatic). I thought only the front valves would switch for the change from V4 to V8, but the back ones seem to still open and close also, even with the auto sound turned off.
Burning Brakes
Joined: Feb 2010
Posts: 878
Likes: 61
From: Louisa, Ky
I'm waiting on replies from owners with 15 models to see if any changes from factory yet for all this programming. My valves sure slam shut hard at about 30 mph with light throttle operation. Also when V4 kicks in.
Race Director
Joined: Sep 2006
Posts: 11,204
Likes: 1,139
From: Santa Rosa Beach FL
That's cause there's a computer generated stop-gap when dlrs are too busy. It senses when the car is brought in for service and it will not replicate.
Advanced
Joined: Aug 2014
Posts: 71
Likes: 1