Amp/sub install + loss of engine power
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This is a discussion on Amp/sub install + loss of engine power within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So two days ago i installed a sony 800 watt xplod amp with one 12" polk subwoofer. (got them for ...

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    Amp/sub install + loss of engine power

    So two days ago i installed a sony 800 watt xplod amp with one 12" polk subwoofer. (got them for free). Well before i actually removed the positive terminal and connected the amp, i hooked the ring terminal temporarily to the postive terminal on the battery to test the amp. Well yesterday i noticed that my car was running wayyyy smoother. it wouldn't buck when i let off the gas in 2nd and the shifts were incredibly smooth. but when i tried to get on it from a light it seemed like it was bogged down and not pulling as hard as usual.

    Also when i was removing the amp power cable from the positive battery terminal i got and electrical arc from the battery to the cable terminal. is there a way the arc could have reset the ecu or something of the like?

    So i guess what i'm asking is there any way that installing an amp and woofer could cause this or is it something different?
    Bugeye Mafia #306

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    Moderator Donkey's Avatar
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    Hard to tell but next time remove the negative battery cable when installing electrical equipment.
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    Quote Originally Posted by mbrown44 View Post
    i actually removed the positive terminal

    i noticed that my car was running wayyyy smoother. it wouldn't buck when i let off the gas in 2nd and the shifts were incredibly smooth. but when i tried to get on it from a light it seemed like it was bogged down and not pulling as hard as usual.

    ?
    Congrats, you reset the ecu .. when you disconnected the pos terminal you removed the constant memory power for the ecu. It then re-sets back to its original factory settings. Drive it for a few more weeks like you normally would and it will adapt back to how it was.

    The arc is normal, and should not have affected your ecu. Its caused by a difference in charge between the caps in the amp power supply and the battery.

    or even in a car without any external amplifiers.. if there is something in the system that creates a draw.. it will arc slightly when the battery is reconnected.
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    Quote Originally Posted by Donkey View Post
    Hard to tell but next time remove the negative battery cable when installing electrical equipment.
    I will keep this in mind next time i install anything.


    Thank you both for the insight and advice.

    also, my car is completely stock as far as mods but i've only had it for 2 and a half months. The previous owner was an older guy who said he didn't mod it. There was an owner before him that i suspect may have modded the car because the green plug that you unplug when installing an accessport in unplugged. so would there somehow be a left over map that i erased when i reset the ecu? or was it just adapted to my driving and it will eventually get back to how it was when it re-adapts to my driving?

    Thank you so much for the help
    Bugeye Mafia #306

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    Moderator Donkey's Avatar
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    Quote Originally Posted by mbrown44 View Post
    There was an owner before him that i suspect may have modded the car because the green plug that you unplug when installing an accessport in unplugged.
    You have it backwards.It is supposed to be unplugged. It is a diagnostic connector. If you plugged it back together,unplug it.
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    Haha nah i didn't plug it in. but there are a few other plugs in that same general area. is that normal?
    Bugeye Mafia #306

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    resetting the ecu wouldnt clear the map present on it

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    ok thanks for clearing up my confusion.

    I'm still kind of a n00b when it comes to most electrical car things
    Bugeye Mafia #306

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    Registered User EvoEatr's Avatar
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    Quote Originally Posted by mbrown44 View Post
    Haha nah i didn't plug it in. but there are a few other plugs in that same general area. is that normal?
    I'm assuming you have a bugeye...Yes there a few "unplugged" connectors down there or just the male or female ends of some...these are used to read codes from ABS and Airbag and sometimes other systems....

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