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Light fluttering sound under load

 
Old 10-05-2018, 10:50 AM
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Default Light fluttering sound under load

Hey all, I just got an 02 SiR (K20A3). I haven't driven a Civic in quite a while before this, so I'm not sure on this. I'm getting this light, high-pitched fluttering sound. It's not a rattle, squeal, or vibration; I would liken it to a constant cricket chirp, but quieter.

Some troubleshooting info:
  • Consistently heard under load, any gear, any speed, any RPM
  • Heard in neutral, but much quieter
  • Does not change pitch or volume with revs or throttle position. It's just on or off
  • I can only hear it from the interior. If I pop the hood and rev it by the throttle cable, everything sounds normal.
  • Everything else is normal, no power loss, runs smooth
I've changed oil and filter, changed air filter, checked fluids. Everything looks pretty good, though the service belts could probably be changed.Is this normal? What else should I be looking for?










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Old 10-06-2018, 01:10 PM
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Default Re: Light fluttering sound under load

Does it change with clutch position? i.e. clutch in, no sound, clutch out, chriping? Sounds like an input bearing or throw out bearing if that's the case.
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Old 10-06-2018, 01:27 PM
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Default Re: Light fluttering sound under load

Originally Posted by thisguyaves View Post
Does it change with clutch position? i.e. clutch in, no sound, clutch out, chriping? Sounds like an input bearing or throw out bearing if that's the case.
Nope. Clutch position makes no difference. In/out, sounds exactly the same.

If I listen very closely, I can hear the sound progressing upwards and downwards corresponding to the opening and closing of throttle. Also interesting, I can hear it somewhat when I rev in neutral while moving, but almost not at all revving while parked, which makes me think it's just air movement. Maybe this is just the way the intake sounds on this car and I'm not used to it?
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Old 10-06-2018, 02:20 PM
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Default Re: Light fluttering sound under load

a video would be helpful. Also check that any splash guards and engine bay plastics are secured. Any modifications to the intake? (Short ram / cold air?) My short ram whistles a bit hahah
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Old 10-06-2018, 02:22 PM
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Default Re: Light fluttering sound under load

a video would be helpful.
It never seems to work well without good recording gear, but I'll give it a try.

Also check that any splash guards and engine bay plastics are secured.
Will do.

Any modifications to the intake?
Intake is stock. Everything else looks to be stock as well.
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Old 10-06-2018, 05:33 PM
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Default Re: Light fluttering sound under load

OK, the recording actually turned out quite well: Recording of fluttering sound.
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Old 10-07-2018, 08:14 AM
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Default Re: Light fluttering sound under load

Sounds like CV axles to me. Jack the car up and give eash axle a solid shaek forward-backward, in-out and see if the rattle a lot. Notice it in the sharp turns?
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Old 10-07-2018, 08:17 AM
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Default Re: Light fluttering sound under load

Sounds like CV axles to me. Jack the car up and give eash axle a solid shaek forward-backward, in-out and see if the rattle a lot. Notice it in the sharp turns?
Thanks, I'll take a look, but I kind of doubt it. I just bought this car and it wouldn't have passed inspection if the CV joints were bad. Steering doesn't affect the noise one way or the other.

I was thinking maybe exhaust leak, but I thought those tend to be a lower, more rattle-like sound.
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Old 10-07-2018, 12:22 PM
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Default Re: Light fluttering sound under load

CV boots are fine.

If I bend down by the driver's side wheel, I can just barely hear it while it's idling. Maybe it's just the intake?
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Old 10-07-2018, 07:08 PM
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Default Re: Light fluttering sound under load

Hello,
From everything I am reading, a clicking when making sharp turns at low speeds seems to be the CV Axle. from the sound of it, it is coming form the drivers side. I am trying to get a hold of a replacement, but none of the parts stores have one in their system. I have a 2015 Accrod EXL V-6. If someone could point me in the direction of a part number and where I can buy it, I would be grateful.
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Old 10-07-2018, 07:22 PM
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Default Re: Light fluttering sound under load

Originally Posted by hdaug View Post
Hello,
From everything I am reading, a clicking when making sharp turns at low speeds seems to be the CV Axle. from the sound of it, it is coming form the drivers side. I am trying to get a hold of a replacement, but none of the parts stores have one in their system. I have a 2015 Accrod EXL V-6. If someone could point me in the direction of a part number and where I can buy it, I would be grateful.
Umm.... did you reply in the wrong thread?
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Old 10-07-2018, 07:33 PM
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Default Re: Light fluttering sound under load

I did, sorry. I was looking for a way to ask my question and it wasnt until i posted to your thread that i realized my mistake.
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Old 10-07-2018, 07:45 PM
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Default Re: Light fluttering sound under load

Originally Posted by hdaug View Post
I did, sorry. I was looking for a way to ask my question and it wasnt until i posted to your thread that i realized my mistake.
Haha no problem, got a free bump out of it
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Old 10-08-2018, 03:37 PM
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Default Re: Light fluttering sound under load

So, I had a mechanic buddy come along for a ride. He says it's just the intake sound, nothing to worry about.
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Old 10-09-2018, 11:23 AM
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Default Re: Light fluttering sound under load

That's good. Make sure the intake is still attached to the engine bay as well lol
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