wsxcde

I have a 2011 TSX Tech with automatic transaction. I have about 32K mi on the car. Everything is stock. Recently, when I pressed the gas pedal lightly to accelerate (around 40mph 2000rpm on local street or 60mph 2000rpm on highway), I could hear a high pitch whistling noise. It was not loud but was noticeable. The noise stopped when I eased off the gas pedal. The audio was off. So it was not from the speakers. I could not reproduce this all the time. But it seemed that I could reproduce it only when the AC was on. Do you think this is a transmission problem, AC problem, or something else?

Thanks for any help.

BattleofXs

it could still be from the speakers if there is a bad ground somewhere

wsxcde

Thanks. But the noise is probably not speaker related since the noise from the engine compartment only happens when I step on the gas pedal lightly with AC on. The noise disappears when I let off the gas pedal.

BattleofXs

does the pitch of the noise increase with the rev?

BattleofXs

could be the compressor or the pulley

wsxcde

The noise does not change with the rev.

wsxcde

I just went to dealership for B1 service. They said they could not reproduce the noise during the test driver after the service. When I drove home afterward, I could hear the noise when I got on the freeway ramp. The service adviser claimed that the tech had checked the AC and transmission. When I looked at the paperwork at home, there was no mention of this.

Well, hope this intermittent noise is not something serious that I need to worry about (:

biliskner10

I have the same problem on my 2010 with manual transmission. I've taken it in three separate times and they have never been able to reproduce the noise. I even took the Service Manager with me so he could hear it. He seemed to think it was a valve on my AC compressor. They did some adjustment on it but the noise remained. I hope it's not a symptom of a larger issue especially with the unwillingness of the dealership to try and diagnose the problem.

boki_cu2

honda did advise there's a noisy pulley and no fix as of yet , well in aus anyhow

hirenp01

funny i just came across this yesterday when i got on highway. I though it was some other car passing me while I was getting on highway.
I also have 2011 with 16k
Lets see if anyone else this too
I will take it to dealer in near future.