Fixing engine whine? | Ford Escort Owners Association (FEOA)

Fixing engine whine?

Discussion in 'ICE (In Car Entertainment)' started by JamesGarfield, Jul 11, 2019.

  1. JamesGarfield

    JamesGarfield FEOA Donator

    Messages:
    454
    Likes Received:
    143
    Trophy Points:
    193
    Location:
    Central TX
    I've got one of those little units that plays SD cards through an FM link into the stereo.

    I'm hearing a soft, high-pitched whine in the background when the engine's on.

    I recall there's a capacitor you can connect to squelch ignition whine.

    What value capacitor is good for this, and does it go... on the alternator output, or the radio's power input?
  2. Pizzaman5000

    Pizzaman5000 FEOA Donator

    Messages:
    1,446
    Likes Received:
    421
    Trophy Points:
    183
    Location:
    Central OH
    I havent seen this problem in years. You can buy a "ground loop isolator" to help this.

    I believe cleaning grounds helps. It seems to be more common on boats where the grounds are wires instead of sheet metal. Don't ask me why... Idk.

    Ground loop isolators are a few bucks on eBay.
    zzyzzx likes this.
  3. denisond3

    denisond3 Moderator Staff Member

    Messages:
    9,836
    Likes Received:
    2,625
    Trophy Points:
    563
    Location:
    south TX or northern VA
    There is a capacitor between the connector to the coil pack and ground. I would think it is about a .01 or 05 mfd unit, of at least 100 volts. Might want to put one between the output of the alternator - and a nearby ground.
    I have never heard whine through my Escort radios. Though I do have some hearing loss. Its the high frequencies that go first and most. I can no longer hear the last 5 keys on a piano, nor anything about above 4th position on the E string of a violin.
    zzyzzx likes this.
  4. JamesGarfield

    JamesGarfield FEOA Donator

    Messages:
    454
    Likes Received:
    143
    Trophy Points:
    193
    Location:
    Central TX
    Well then, my old friend Denisond, we shall apply an ample dose of Dolby in our piano and violin pieces .

    Thank you for the refresher on the value and location on the noise suppressor capacitor. I seem to have solved the problem this morning. I had been using a power distribution thing, which takes the cig lighter and makes it into 4 power outlets. Apparently the ignition whine noise was getting picked up by the bunch of wires running around that thing, because when I plugged the SD player straight into the cig lighter port, the whine was gone and the music was beautiful again. Even the last 5 piano keys ;).
  5. denisond3

    denisond3 Moderator Staff Member

    Messages:
    9,836
    Likes Received:
    2,625
    Trophy Points:
    563
    Location:
    south TX or northern VA
    What? Talk louder and slower!
  6. neuspeedescort

    neuspeedescort Moderator Staff Member

    Messages:
    8,121
    Likes Received:
    92
    Trophy Points:
    348
    Location:
    wenatchee, wa
    my first question is. is it a stock stereo or aftermarket?
    denisond3 and zzyzzx like this.

Share This Page