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Mysterious engine sound 308 GTB

Discussion in '308/328' started by Andreas Engesvik, Aug 11, 2025 at 5:23 PM.

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  1. Andreas Engesvik

    Andreas Engesvik Karting

    Mar 4, 2020
    150
    Oslo, Norway
    Full Name:
    Andreas Engesvik
    #1 Andreas Engesvik, Aug 11, 2025 at 5:23 PM
    The sound occurs only when cold starting - and then It disappears after a few minutes. The engine runs fine - euro dry sump 77. Thanks
     

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  2. DanielGA

    DanielGA Karting

    Mar 19, 2018
    160
    Midwest
    Full Name:
    Daniel A.
    #2 DanielGA, Aug 11, 2025 at 5:29 PM
    Well audios in videos are not ideal for this but.....

    1. sounds like a loose screw....but that going away would not be expected.
    2. could be a crack/hole that upon warm-up seals...I had a maybe similar noise because one for the airpump plugs in exhaust header got lose...easy fix.
    3. you are pointing at the water pump...is that where it is coming from? if you put your hand on it, does it vibrate?
     
    Andreas Engesvik likes this.
  3. Andreas Engesvik

    Andreas Engesvik Karting

    Mar 4, 2020
    150
    Oslo, Norway
    Full Name:
    Andreas Engesvik
    #3 Andreas Engesvik, Aug 11, 2025 at 5:41 PM
    Thanks - sound both like a loose screw - small stone caught somewhere - and almost like static electricity. I have driven the car approx 500 km since this sound first appeared last week.
    No vibrations from the water pump either. The sound is difficult to locate. I will check the air pump plugs.
     
  4. Dockboy

    Dockboy Formula Junior
    Silver Subscribed

    May 11, 2013
    614
    Maryland
    #4 Dockboy, Aug 11, 2025 at 6:31 PM
  5. spirot

    spirot F1 World Champ

    Dec 12, 2005
    15,145
    Atlanta
    Full Name:
    Tom Spiro
    #5 spirot, Aug 12, 2025 at 9:04 AM
    Most likely its accessory belt slap. The belts take on a "set" if not used regularly, so when you start the car the belt snaps up and down on the pully. Not a horrible thing, use some belt dressing to improve its adherence, but best to change out the accessory belt. This is not the TIMING BELT - its the Accessory Belt for water pump, alternator and AC.
     
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  6. moysiuan

    moysiuan F1 Rookie
    Silver Subscribed

    Nov 1, 2005
    4,199
    Canada
    #6 moysiuan, Aug 12, 2025 at 10:30 AM
    Pretty sure that is the belt. There is a hard plastic spine inside these thin section a ccessory belts, it takes a set with age and makes this kind of static popping sound, especially if the belts are a bit loose. It would go away after the belt heats up.

    The accessory belts are supposed to be checked and retensioned after initial installation. Many would not do this, so the belts can be a bit loose on many cars.

    If your belts are indeed new and not due for change, you could just try retensioning.
     
  7. flyngti

    flyngti Formula 3

    Jul 16, 2009
    1,249
    Snohomish, WA
    Full Name:
    Eric L
    #7 flyngti, Aug 12, 2025 at 1:09 PM
    For the love of all that is holy, DO NOT buy this particular piece of garbage. I bought one and immediately threw it in the bin the first time I tried to use it. Don't get me wrong, automotive stethoscopes are very useful for tracking down noises. Just don't waste your time and money on this one from HF
     

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