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Thread: Query about Unusual Engine Noise in Honda City iDSi

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    Default Query about Unusual Engine Noise in Honda City iDSi

    Salam PWers!

    From the past few days, I am hearing a rather unusual noise from the engine bay. It sounds like a proper loud 'kar kar'. This sound can only be heard when i have driven for about 2-3KM and AC's compressor is on. This sound goes away when i turn off the AC or press the clutch.
    When I start the car in the morning, let it warm up until it reaches the optimum temperature, and then turn on the AC the noise is not there. It only comes after I have driven for about 2-3KM.
    Could it be the compressor noise? If it is, then why does it go away when the clutch is pressed? Could it be the clutch? If it is, then why does it go away when the AC is turned off?
    This noise started when I got the rockers adjusted and TB serviced a while back. Could it be the noise of a faulty IAC Valve? As i do know, that the IACV is malfunctioning. Could it be sticking and hence making noise?

    Any suggestions and help will be deeply appreciated.

    Regards,
    Faizan Ahmed

    Bumper Sticker: "I feed off other people's rage, so drive carefully :-)."

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    Noise that goes away when you press the clutch pedal... sounds like a problem with the clutch throwout bearing.

    If it's an AC specific problem then it could be the compressor clutch bearing or idler pulley bearing.
    Never argue with an idiot, they drag you down to their level and beat you with experience.

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    If it was the Clutch Release/Throw-out Bearing, then why would the sound only come with AC on?
    If it was Compressor Clutch Bearing then why would the noise vanish when the clutch is pressed?
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    And idler pulley has whining sound and not a 'kar kar' sound.
    Do note that the sound is only prominent at the idle rpm of 800-850. Above this, the sound either vanishes or become suppressed by regular engine sound at higher rpm. When the AC is turned on, the rpm jumps to 1300 from 800 and then settles to 850.
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    strange... never witnessed such a sound in my car...

    btw yaar, did your rpm drop issue get rectified...?
    Agar chy bu'tt' hain Jama'at ki Aasteenon main - Mujhay Hai Hukm-e-Aazaan LA ILA HA ILL ALLAH...!

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    Quote Originally Posted by devilz_apprentice View Post
    If it was the Clutch Release/Throw-out Bearing, then why would the sound only come with AC on?
    If it was Compressor Clutch Bearing then why would the noise vanish when the clutch is pressed?
    If it only comes on with the AC, then that rules out the clutch throw-out bearing.

    I think its either the compressor clutch bearing or the idler pulley bearing. Both would sound like a 'kar kar' if bearing is bad.

    When you press the clutch does the RPM drop below 500? If it does then that could explain why the noise goes away when the clutch is depressed. That would disengage the compressor and thus the noise would go away momentarily, only to reappear once the compressor kicks back on.
    Never argue with an idiot, they drag you down to their level and beat you with experience.

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    when the clutch is pressed with AC on, the idle rpm remains steady at 800-850. This rpm is not suppose to go down. does pressing the clutch disengages compressor?
    The sound goes away only when the clutch is pressed (not depressed).
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    Quote Originally Posted by devilz_apprentice View Post
    when the clutch is pressed with AC on, the idle rpm remains steady at 800-850. This rpm is not suppose to go down. does pressing the clutch disengages compressor?
    The sound goes away only when the clutch is pressed (not depressed).
    'depressed' and 'pressed' mean the same thing.

    Yes, the RPM is not supposed to go down, it should stay between 800-850 RPM. What I was trying to say is that if RPM drops too low and the car begins to stall then the system is designed to disengage the compressor momentarily to stabilize RPM.

    But since you say RPM is stable, that is not the case here.

    The sound going away when clutch pedal is depressed is strange. But I am pretty sure that the 'kar kar sound is a bearing. Since it happens when the AC is turned on, I would start by checking compressor clutch and idler pulley first and then move on to other things.

    Posting a video would help in diagnosing the problem.
    Never argue with an idiot, they drag you down to their level and beat you with experience.

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    Get Compressor Bearing And Idler Pulley Bearing Checked 1st By Taking Off Belt......If Its Not Then Possibly Be So Many Things..

    Putting It On Load Can Make Bearing Noise Much More Worse....Make Sure W/o A/c And W/o Clutch Depressed....It Is Not There..Maybe Its There But Intensity Is Quiet Low So You Can't Hear....!!

    If Its Clutch Bearing...It Will Sound Constantly On Load

    Do It Goes Worse Or Better With Throttle Up And Down???

    And Its A Strong Kar Kar Noise ??? Or Humming Type....Mostly When Ball Type Bearings Go Bad They Usually Makes Humming Noise......Not Kar Kar Noise...till Something Is Broken ....!!
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    On optimum running temperature while idling, the noise only comes with AC on, compressor running and clutch not pressed.
    If i turn off the AC, the noise goes away and the engine 'purrs' like any other.
    With AC on and clutch pressed, the noise goes away then as well.
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    get a stethescope and put it on stuff to identify the noise, sounds like your belt adjuster, but the clutch playing part in it is strange.

    broken clutch plate springs can be the cause too - they emit a "rattle" when loose
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    by belt adjuster, you mean the idler pulley?
    What i fail to understand is that if was related to the clutch then why would the sound only with AC on? I have tried putting load on the engine without AC but there simply isn't any noise at all!
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    get a stethescope or use a pipe to "hear" the noise.
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    showed the car to the foreman of city sales. he said the the springs in the clutch plate are a little loose due to which such 'kar kar' noise is heard. he suggested that this noise is prominent only at idle due to the load of AC on idle. he told me not to change the plate as it's not much to be concerned about. suggestions please?
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    bump!!!
    Bumper Sticker: "I feed off other people's rage, so drive carefully :-)."

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    Default Honda City IDSI Vario 2004

    My City Vario is generating some strange noise (e.g kar kar kar) when I put the lever on D or R. The RPM also move down to even 100 or 150. I have changed the transmission oil (CVTF) but the starts again after 4 days. Although there is no noise while driving, it only comes in the start.
    I have no exact idea that is the sound coming from engine or gear.
    Any body knows whats happening

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    @poster u got the bearings checked?specially a.c compressor's?
    only a speculation btw.
    ''Peace is an unstable equilibrium,that can only be preserved by acknowledged supremacy and...equal power.'' ''We give up the fort when there is not a man left to defend it.''

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    <iframe width="420" height="315" src="http://www.youtube.com/embed/QS51Db5U_KQ" frameborder="0" allowfullscreen=""></iframe>

    Posting a video of the noise.
    The AC compressor turns off at 0: 07 and then turns back on at 0:16. From 0:18 onwards, the noise can be heard.
    It is not a rattling, it's a proper 'kar kar' noise.
    It is only be heard when the car is in neutral, AC on and clutch not pressed.
    As soon as the clutch is pressed, the sound goes away even though AC compressor is still on.
    Without pressing the clutch, if the AC compressor is turned off the sound still goes away.
    Any suggested remedy to the problem will be deeply appreciated.
    Bumper Sticker: "I feed off other people's rage, so drive carefully :-)."

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    ^^wow thats some slapping sort of noise. never heard that from my car. Btw, u need to get the small "cheen cheen' noise checked as well. Some bearing has gone dry and could cause a noisy havoc for u in the future.
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    that is actually the noise of the TB without air intake.
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