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Discussion Starter #1
Guys i got my first problem with my car. I am getting a "flapping or a baseball card in the spokes sound" when i am accelerating at different speeds. Cannot trace the origin of the sound because it sounds like it is coming from the left or right rear, or the front of the car. Looked under it and noticed nothing hanging. Car and transmission are running great. Seems to be getting worse, as i give it gas it makes sound, when i release gas it stops. Does not happen all the time. Occasional.

Any suggestions or links to previous posts on this would be appreciated. Again car is running great.
 

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If you were outside of the car, do you hear anything at idle with the hood up? Loose spark plug? Loose or cracked header or exhaust? Just a few ideas...
 

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Eddie, you may want to take someone with you to concur about the sound, or see if it can be repeated going by someone standing out side the car.
 

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Discussion Starter #4
Guys thanks for responding. Piranha there is no sound outside the car that resembles this noise i am hearing. I only get it when i am accelerating but as i said not all the time. Norm i brought my brother in laws with me on two occasions, when i made the sound, he said it sounded like right rear area of car, i said no it sounded like left rear area. Now as of last night the sound seems to be in front of the car. I am totally perplexed right now. But again it sounds like something flapping or the baseball card in the spokes sound.

Just to ad. I researched this online and Camaro owners were complaining of this sound also. Someone said possible stone(s) in the wheels?
 

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Guys thanks for responding. Piranha there is no sound outside the car that resembles this noise i am hearing. I only get it when i am accelerating but as i said not all the time. Norm i brought my brother in laws with me on two occasions, when i made the sound, he said it sounded like right rear area of car, i said no it sounded like left rear area. Now as of last night the sound seems to be in front of the car. I am totally perplexed right now. But again it sounds like something flapping or the baseball card in the spokes sound.

Just to ad. I researched this online and Camaro owners were complaining of this sound also. Someone said possible stone(s) in the wheels?
Pebble or small stone in a tire could certainly be the culprit. And if you drive in an area or through an area with pebbles/small stones you could be periodically throwing one out from the tread and the sound will stop, then pick up another in a different tire and the sound starts again.
 

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Hi Eddie - I have a thought on this - having experienced some similar sounds on occasion. Are you driving with the windows down next to a close boundary on the right, like a sound wall, guard rail or even thick forest? If so, i believe the sound is related to the spoked tires cutting through the wind, and echoing off whatever your driving next to. Hence the "cards in spoke" sound. I have the 5 spoke base wheel and i see you do as well. I like to use the "Occam's Razor" approach to problem solving and it might just fit in this case ;)
 

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Discussion Starter #7
Frank i will give you a silver star for your effort. But not the gold one. I had my car out tonight put about 100 miles on it driving to a casino from Rhode Island to Conn. Car ran as perfect as it should be. Transmission shifted fine car floated along without issues, power to pass was there etc. But the noise was also there. Started about two miles into my trip neighborhood roads, main roads, up hills, level ground, down hills. Also i was on the highway and it did it there, when the car was in v-4 mode and at cruising speed in v-8 mode. What i did notice now is that i can go for example 5 miles no noise, then get it 3 times in the next 5 miles. Then i can go 25 miles get it only once. ( this is including stop and go traffic red lights etc. On the highway i went a 42 mile stretch then did not get it at all. Different speeds accelerating to pass decelerating for cars etc. I am not an expert and certainty do not know this car as well as other members but, given the way the car is performing can it be a rock(s) tucked up under the car somewhere? Maybe a plastic bag from the road? Possibly a piece of plastic hanging as i result of something i ran over? Until i get it on a lift i have just ideas no answers. I am due for an oil change in about 800 miles if the car does not get any worse, should i ride it out? As always thanks again..I am stumped
 

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Hmmm, well it was worth a shot - do you hear it with the windows up? Does it only happen above a certain speed? Perhaps its still environment related. One thing for sure i have come to find out that these beasts rip and snort and tick and rumble and sometimes its just the "nature of the beast!". Good luck on your quest for the answer.
 

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Intermittant sounds are always the most difficult to track down, as it's tough to rule out anything such as road condition, weather-related conditions, etc. Perhaps walk around the car, check for loose body panels, loose wheel house liners (the fuzzy pieces in the wheel wells) by gently tugging on lips and edges. If a retainer is missing or broken, its possible cross-winds or air flow at certain speeds could allow a loose panel to flap intermittantly. Also look through the wheel spokes to see if some road debris is lodged in the suspension near a wheel or even in a brake caliper. Once you can get it on a lift check wire harnesses, hoses, hard fluid lines for any that may be loose, missing retainers, etc. It may seem tedious, but you'll need to follow a plan to eliminate possibilities one at a time. Hope you find the problem soon!
 

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Eddie; What kind of tranny do you have? When you hear this sound is there a load on the drive-line, either by you or by an incline in the road? Have you tried to either downshift or upshift to see if it affects the noise in any way?
 

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Discussion Starter #11
Chip. I have the a8. If i am accelerating i get the sound, it doesn't matter if i am on a straight away or an incline. If i take my foot off the gas, the sound stops. If i immediately accelerate again the sound comes back. Again i must stress and i sound like a broken record but it happens when the car wants it to happen. See my post number 7. Only happens when i am accelerating. If i am driving normal like a steady highway speed i will not get the sound at all.

Thanks
 

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This is a wild guess, check both of your NPP hardware behind the exhaust tips, see if anything is loose. :confused:
 

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My guess is, there is a rotating part of the drive train lightly hitting something. When accelerating, maybe the car moves down on its suspension, it hits, and when not accelerating, there is enough clearance where it does not hit.
 

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On my Z06 the factory do not install the 4 rear screws securing the large, flat plastic panel covering part of the bottom of the engine compartment ... allowing that panel to hang down a bit, etc

Perhaps ???
 

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Discussion Starter #15
I am taking the car out tonight going to try to get a video of the sound with my wife's iphone. Going to look over the car again for something loose and will check the npp. Will get back to you.
 

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Eddie; Here is an odd ball request. Find a place where you can safely back your car with a quick pace and see if you hear that noise over the tranny whine in reverse. Be safe doing it though, and I think you would be better off / safer doing this during the day rather than @ night! Not sure what this will prove, but you never know what you can find out...
 

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Discussion Starter #17
Car is going in for an oil change soon. I am going to ride the noise out till it gets on the lift. I am convinced that it is not a mechanical issue. Will keep you posted with an updated thread....
 

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Discussion Starter #18
Well its official i am taking my car in next week to diagnose and hopefully fix this sound i am getting. It has gotten worse and is noticeable if people are walking down the street as i pass by, car is running fine other wise. Well get back to you when i have some results from the dealer.
 

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You may be a candidate for the "warbling" sound covered in this and another Corvette forum. Most of us drive 2016s but I believe there are 2015s as well. The sound occurs in any gear but the most common thing is that it comes and goes at right about 1500 RPM. Doesn't make any difference what mode you're in, how the NPP is set-up, whether you've pulled fuses or not to disable the NPP. It almost sounds like a rattle but it isn't quite that. Some folks have had their trannys and rears changed out to no avail. Others have had the exhaust changed out with no joy. Several of us have cases open with GM on this. The latest theory of many thus far is that it's an exhaust component and the GM has a bad bunch that they've installed. It has occurred in my car since the day I bought it new. Still there after 2600 miles with no apparent harm done but we're still waiting on GM to get their act together and fix this.
 
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