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noise from MW when on the move Vauxhall Zafira

Discussion in 'ICE, Sat Navs & Dash Cams Forum' started by rbartlett, Apr 22, 2005.

  1. rbartlett

    rbartlett
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    Hi guy's
    I only listen to R5 so medium wave it is. On FM it's fine

    I recently bought a s/h Zafira. All was well in London town as I drove home but as I got further away the interference became intollerable.
    I tried both frequencies and it was drowned out by the noise.

    However when I stop the noise stops. If I drive very slowly you can hear it clicking which speeds up as the car does.

    I took it to a local car hifi specialist -who has been in business for donkey's- and he just shrugged his shoulders and said "dunno,it's probably the engine management system best take it to the dealers"

    Not quite the answer I was looking for...........

    I understand that DAB is probably the way forward in the long term but if anyone has got some idea on this I'd love to hear...

    Cheers

    Richard
     
  2. lynx

    lynx
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    This type of interference can be difficult to source, the most likely culprit is liable to be the alternator. Check if Zafira has an antenna connection (possibily mounted behind a front kick pannel ?) that has come loose as this may also cause interference. My gut feeling would be to start with the alternator though, checking all connections are secure and also check if it has a resistor to eliminate interference.
     
  3. rbartlett

    rbartlett
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    I wonder how the alt can be at fault when if you rev in netural there is no noise but as soon as you move the interference starts??

    confuzzed

    cheers

    richard
     
  4. pauldrage

    pauldrage
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    one could spend years trying to trace fault like that mate. :thumbsdow
     
  5. rbartlett

    rbartlett
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    slight update which may/may not shed some light..

    I have a pda gps which although BT requires charging. I found on my old car it was best to hardwire to a perm live so it's always charging and I can leave it on constantly.

    so I popped out the radio to find perm.live earth.

    now I found them and just to check put a meter -and here's the crux- found the earth has a resistance of 16.5 ohms to the crossmember behind the radio and 65 ohms to the door closer.

    These strike me as high and wonder if the earth isn't quite what it should be

    any ideas??

    cheers

    richard
     

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