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Thread: Engine noise with M2-atx

  1. #11
    Maximum Bitrate Injector's Avatar
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    Quote Originally Posted by ggcr View Post
    what did you tap into get you power. Fuse panel areas causes alot of noise issues. It best when you get straight from the battery then tapping into a power such as the radio.
    i didn't tap into anything, i used an amplifier kit to wire the pc, so BATT+ comes all the way fused from the battery.

  2. #12
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    Thats good. It must be the wire coming out of the computer to the back of the headunit. did you run line out wire with your power? if so try running it a different route away from that power wire. did you have a aux on the headunit or you used a hi-low converter? Also the quality of the wires you use will be a big factor. The cheap ones tend allow radiant noise. They are not shielded as well as the higher priced one. Let me know how it turns out.

  3. #13
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    Quote Originally Posted by ggcr View Post
    Thats good. It must be the wire coming out of the computer to the back of the headunit. did you run line out wire with your power? if so try running it a different route away from that power wire. did you have a aux on the headunit or you used a hi-low converter? Also the quality of the wires you use will be a big factor. The cheap ones tend allow radiant noise. They are not shielded as well as the higher priced one. Let me know how it turns out.
    it's a line out cable to the aux port on my head unit, but the power cable runs on the passenger side, data lines run on the driver side and the audio cable runs by itself on the middle (aux port is inside my armrest/console) also if it was RF it would have made the noise when i plugged in my laptop, but it didn't.

  4. #14
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    Re-reading your original post, I was just curious how the music sounds if you just let it ground through the radio. Does it still make noise?

    A couple of other questions - any noise when the car is off or only when it is running?

    Also, unplug the lineout and listen to it through headphones. Any noise?

    I think you may be down to either a ground loop isolator or trying a USB sound card. I'd go with the soundcard if audio quality is important to you. Some people have reported success with them and others claim it clips some of the frequencies.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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  5. #15
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    Quote Originally Posted by Bugbyte View Post
    Re-reading your original post, I was just curious how the music sounds if you just let it ground through the radio. Does it still make noise?
    you mean if i unplug all the grounds and just leave the headphone jack plugged in?

    A couple of other questions - any noise when the car is off or only when it is running?
    when the engine is off i have hard drive noise, it crackles when the hard drive head moves, with the engine running i get hard drive noise and alternator whine
    Also, unplug the lineout and listen to it through headphones. Any noise?
    great minds thinks alike because i tried this already, i tried it straight from the pc and at the end of the extension cable, i could not hear the noise but i think it was because the volume was too low, or because with the headphones not grounded the electricity has no path to flow

  6. #16
    Maximum Bitrate Injector's Avatar
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    i took some pictures with my multimeter to get resistance readings.
    they were all done at the 200M rating on the multimeter.

    also i noticed that after i turn on an accessory the resistance gets higher, is this normal?


    By crashinjector, shot with FinePix A345 at 2008-12-07


    By crashinjector, shot with FinePix A345 at 2008-12-07


    By crashinjector, shot with FinePix A345 at 2008-12-07


    By crashinjector, shot with FinePix A345 at 2008-12-07


    By crashinjector, shot with FinePix A345 at 2008-12-07

  7. #17
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    Looking at some of the other posts on this issue, one person had success by isolating the power supply from the PC case.

    Have you seen this guide on troubleshooting interference noise? It may be helpful and suggests at a minimum using a ground loop isolator to pinpoint the cause of the noise.

    Here's a guy that had a similar type of problem and it turned out to be his radio.

    Based on those articles, it sounds like your PC sound output sees two different grounds - one at the PC side and another on the radio side. While you have grounded everything to the same location, there must be some issue at the radio itself because listening to the line output with headphones, it sounds clean (you can further test this by hooking up some desktop PC speakers so you can hear it better) and also when you play an ipod into the radio it sounds clean.

    Final thing to test to isolate the radio as the source is to play the iPod using the RCA cable that runs from the PC to the radio. Try it both with and without the car running and with/without the PC running. If you don't hear anything, then the cables are not the source of the noise and you'll know it is the radio itself.

    In that case, it sounds like a GLI will work for you or the alternative is to replace the radio.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  8. #18
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    well i kept playing with my multimeter and i narrowed it down to to the pc grounding through the speaker wire so i broke down and and bought a ground noise isolator and it's now as quiet as a cemetery, all the noise is gone, no hard drive noise nor alternator noise.

    thanks for all your help guys.

  9. #19
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    Glad to hear it. You ran that problem right down to the ground and squashed it. Enjoy.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  10. #20
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    I've been dealing with the same issues (same car) and have been hesitant about buying one. I'm using a USB DAC and don't really want to take the chance of degrading signal (as some low end GLI's do). What kind did you get/where did you get it if you don't me asking?

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