Occasional rattling sound at idle

  1. rjschof

    rjschof Member

    Joined:
    Feb 20, 2017
    Posts:
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    Location:
    Virginia Beach, VA
    Car(s):
    Honda Civic 2016 EX w/ Sensing
    Okay, here's the deal. I am going to try and describe this with as much detail as I can to see who else has the problem and what might fix it. This is extremely difficult to diagnose because it is intermittent, but it is always for a few minutes after the car is turned on.

    Occasionally, when I first start the car, I get a fairly loud vibration/rattle that sounds like it is coming from the engine compartment. The sound remains when I turn the AC/blower fan off. When I start moving, the sound goes away, but if I stop and idle, the sound is back. The sound tends to be noticeable more often when I am shifted into Reverse or Drive. After everything warms up, the sound appears to go away. The pattern of the rattling sound itself is similar to the sound that the exhaust makes when you stand by it if the car is on.

    My theory is that the exhaust rattles a lot and the vibration itself is moving all the way up to the engine. This is causing the sound to sound like it is coming from the front of the vehicle when I am sitting in the driver seat.
    1. Does anyone else have a similar issue?
    2. Did anyone get this resolved by a dealer?
    3. Do you think it is actually the exhaust, or something else?
    If it will help, I will try to get it on video and upload it here.
     
    MutatedMango thanked this.
  2. neaux

    neaux Member

    Joined:
    Mar 3, 2016
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    Location:
    STL
    Car(s):
    2016 LX
    Did you ever figure this out?
     
  3. hicompb18c1

    hicompb18c1 Senior Member

    Joined:
    May 22, 2017
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    Location:
    San Diego
    Car(s):
    2019 Civic Si Sedan, 2018 Accord LX (wife's)
    Bumping. My Si (1.5) only has 5k miles on it and i get a weird intermittent noise like this at idle too. It's not the normal DI "clicking" sound.

    It sounds like a squeaking or rattling, like maybe something is rubbing or vibrating. The sound appears loudest towards the back & driver's side of the motor, but I can't tell.

    - It only happens at idle, giving it even the tiniest bit of gas makes it go away instantly

    - Happens with the AC on or off

    - Doesn't sound like it's coming from any of the belts... Again, not 100% sure

    - Motor is stock and I haven't added/moved anything in the engine bay.
     
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