Grinding/Abrasive Noise while foot off Gas pedal

[polski]

Does anyone else have a slight abrasive noise coming out from the front of the car when they are just coasting with foot off the gas pedal? It sounds almost as if it's brake noise. The noise goes away once you start to accelerate again or while coasting you press in the clutch then the noise goes away? I am just gauging to see if anyone else has experienced something similar.

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[ABPDE5]

Wastegate rattle? If so, it's normal.

 

[optronix]

I'm actively looking to get a dealership to acknowledge EXACTLY what this noise is.

FWIW, there are quite a few threads on this topic (the consensus is that it is indeed associated with the electronic wastegate), so you can at least take some comfort in knowing there are a few of us dealing with this same thing and our cars haven't exploded... but it's annoying and the way my brain works I just can't go on living without knowing WHY.

My first episode with the dealer ended up with them fixing "something" that may or may not have been a noise, but I can still duplicate what you're describing at will so it's going back Tuesday. I'm going to insist a tech and/or service manager go on a ride with me so they can't pretend they fixed another make believe noise this time.

Also another important note to add, at least in my case- there's a pretty definitive vibration coming through the gas pedal when I go through the invocation motions to produce this noise. That's what has always had me skeptical that it's wastegate noise- feels drivetrain-related to me. But I'm just a dude on a forum that has dealt with this shit since I noticed my first week of ownership.

I will definitely keep the forum updated if I have anything of note to report.

 

[KingCollector]

I'm actively looking to get a dealership to acknowledge EXACTLY what this noise is.

FWIW, there are quite a few threads on this topic (the consensus is that it is indeed associated with the electronic wastegate), so you can at least take some comfort in knowing there are a few of us dealing with this same thing and our cars haven't exploded... but it's annoying and the way my brain works I just can't go on living without knowing WHY.

My first episode with the dealer ended up with them fixing "something" that may or may not have been a noise, but I can still duplicate what you're describing at will so it's going back Tuesday. I'm going to insist a tech and/or service manager go on a ride with me so they can't pretend they fixed another make believe noise this time.

Also another important note to add, at least in my case- there's a pretty definitive vibration coming through the gas pedal when I go through the invocation motions to produce this noise. That's what has always had me skeptical that it's wastegate noise- feels drivetrain-related to me. But I'm just a dude on a forum that has dealt with this shit since I noticed my first week of ownership.

I will definitely keep the forum updated if I have anything of note to report.

I feel it in the accelerator pedal as well. Another opinion I've seen is just a harmonic kind of vibration since it's always between 3/4K RPMs. I can get behind this explanation a bit more than EWG. But I still want it GONE! LOL

 

[Murry101]

I had a problem similar to what you describe, although I would not describe the noise my car made as abrasive. The gas pedal vibrated a lot, particularly in Sport+ mode between 3k and 4k rpm when I lifted off the throttle but kept my foot on the pedal. It was so bad my foot felt numb. So, I went to the dealer and asked if I could drive a new one for comparison. They obliged my request and I was able to confirm that my car was different and had an issue. I dropped it off a month ago and just got it back this week. They were able to duplicate the issue. After multiple test drives and troubleshooting attempts, a tech narrowed it down to something in the passenger side drive train. The vibrations stopped when they stopped the passenger side wheel. First they replaced a wheel bearing. When that didn't resolve the problem they replace some bearing assembly that bolts to the transmission. That did the trick. Way less vibration. Night and day difference. Hope this helps.

 

[optronix]

I had a problem similar to what you describe, although I would not describe the noise my car made as a grinding sound. The gas pedal vibrated a lot, particularly in Sport+ mode between 3k and 4k rpm when I lifted off the throttle but kept my foot on the pedal. It was so bad my foot felt numb. So, I went to the dealer and asked if I could drive a new one for comparison. They obliged my request and I was able to confirm that my car was different and had an issue. I dropped it off a month ago and just got it back this week. They were able to duplicate the issue. After multiple test drives and troubleshooting attempts, a tech narrowed it down to something in the passenger side drive train. The vibrations stopped when they stopped the passenger side wheel. First they replaced a wheel bearing. When that didn't resolve the problem they replace some bearing assembly that bolts to the transmission. That did the trick. Way less vibration. Night and day difference. Hope this helps.

ANY more details at all would be helpful.

If they have another one at the dealer on Tuesday I'm going to ask if I can drive it.

 

[SilverRocket]

I had a problem similar to what you describe, although I would not describe the noise my car made as a grinding sound. The gas pedal vibrated a lot, particularly in Sport+ mode between 3k and 4k rpm when I lifted off the throttle but kept my foot on the pedal. It was so bad my foot felt numb. So, I went to the dealer and asked if I could drive a new one for comparison. They obliged my request and I was able to confirm that my car was different and had an issue. I dropped it off a month ago and just got it back this week. They were able to duplicate the issue. After multiple test drives and troubleshooting attempts, a tech narrowed it down to something in the passenger side drive train. The vibrations stopped when they stopped the passenger side wheel. First they replaced a wheel bearing. When that didn't resolve the problem they replace some bearing assembly that bolts to the transmission. That did the trick. Way less vibration. Night and day difference. Hope this helps.

Thank you! When you have a chance, can you let us know the specific part. I might bring mine in for this, it's starting to annoy me TBH.

 

[Murry101]

Thank you! When you have a chance, can you let us know the specific part. I might bring mine in for this, it's starting to annoy me TBH.

I'll call the dealer and ask. I checked the paperwork and it makes no mention of the part in question. They did pilfer it from a brand new Type-S that was damaged in transit because there are none of these parts around. They had to overnight the wheel bearing from California when they replaced it.

 

[dockleryxk]

It's the wastegate actuator. Pop your hood and poke around on it. You'll see why it makes the noise. It's just how it works. Buy some of those ring earplugs or something lol

 

[polski]

Yeah I've seen a few people mention the wastegate rattle but the noise to me wouldn't seem like a rattle noise but more like something brushing against something else like medal on something abrasive but if we are all describing the same thing and it's something normal then I am fine with it. I also do not have any vibration in the pedals only the noise that I mentioned.

 

[Evolving_e63]

Yeah I've seen a few people mention the wastegate rattle but the noise to me wouldn't seem like a rattle noise but more like something brushing against something else like medal on something abrasive but if we are all describing the same thing and it's something normal then I am fine with it. I also do not have any vibration in the pedals only the noise that I mentioned.

I get a loud screech from the brakes. I think it's just a rock or pebble gets wedged in there. When I accelerate it goes away

 

[polski]

I get a loud screech from the brakes. I think it's just a rock or pebble gets wedged in there. When I accelerate it goes away

Yeah I've had that in this car before but this does match up with everyone else saying it's heard while coasting but then goes away when the clutch is depressed

 

[Evolving_e63]

Yeah I've had that in this car before but this does match up with everyone else saying it's heard while coasting but then goes away when the clutch is depressed

When I coast it's a different noise all together. Coasting it sounds like when your brakes are wearing out and u get that noise to tell u it's time to change em. Everyone says it's the wastegate so I just deal with it

 

[Victorofhavoc]

I'll just point out that the throttle is electronic, not cable, so if you're getting vibrations in the pedal, there must be some contact happening against the unibody that would transfer that vibration to the firewall area for the pedal box. This is absolutely abnormal and should never occur.

If you're getting the high pitched metallic whistle/grinding noise, it's definitely the wastegate. The design of it has way too much tolerance for movement.

Will it break anything? No
Is it normal? No, it's lazy design.
Will the dealer and acura insist that it's a characteristic of the platform, so it's a normal noise to expect? Yes... As much so as the huge tolerance in the window play and mismatched body panels.

 

[StingertimeNC]

When I coast it's a different noise all together. Coasting it sounds like when your brakes are wearing out and u get that noise to tell u it's time to change em. Everyone says it's the wastegate so I just deal with it

I feel like this is a rock in between your heat shield and the rotor. May be worth trying to isolate which wheel it is and pop that wheel off and have a look with a flashlight.

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