Question about 1987 Honda Civic

1 Answer

My battery light in dash and high idle.

I can use the lights without the key in, my fan runs fine without the car started. Unplugging the battery from the car after it's running results in a still running car. It's a carburated engine which will not idle down it stays above 2K and will creep up towards 3K. Very occasionally the idle will drop, but once engine is revved over 2K it sticks there.

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  • 7 more comments 
  • devon_slavko Feb 01, 2009

    The only light that's on besides my brakes is a little red battery. It looks like a box with two posts and a + on one side and - on the other.

  • devon_slavko Feb 01, 2009

    Would a bad battery keep my idle high?

  • devon_slavko Feb 01, 2009

    So you suggest I try with a new battery? I tested the volts on DC with car off it's on 12, and with car on it's about 13

  • devon_slavko Feb 02, 2009

    So if this isn't my battery or alternator, what else could it be? How do I eliminate the battery and alternator as a problem?

  • devon_slavko Feb 02, 2009

    This just a month old battery though, is it possible I was sold a bad battery?

  • devon_slavko Feb 02, 2009

    Is it safe, I guess for me just as much as my car, for me to drive it to the nearest autoparts store to get it tested?

  • devon_slavko Feb 03, 2009

    Well, after a 90 dollar alternator piece, the thing still works thanks a lot :D

  • Roberta Smith
    Roberta Smith May 11, 2010

    battery or alternater appears to be the issue then. as the vehicle runs when you unhook the battery i would suggest it is the battery



    Robert

  • Roberta Smith
    Roberta Smith May 11, 2010

    check engine light is on ?



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  • Master
  • 5,158 Answers

It may mess up the voltage to the sensor giving it false information and changing the idle speed.

Posted on Feb 01, 2009

  • 2 more comments 
  • Roberta Smith
    Roberta Smith Feb 02, 2009

    the extra voltage should be the alternator charging... 12 isn't completely accurate... more like 13.8 i believe

  • Roberta Smith
    Roberta Smith Feb 02, 2009

    You have basically already done the test. to decide if the battery or alternator is at fault is by unplugging the battery when it is running. if i keeps running... the battery has issues.... if it had died... it would have been the alternator... you mentioned unplugging the battery and it kept running. so that only leaves the battery needing replacement





  • Roberta Smith
    Roberta Smith Feb 02, 2009

    Ok i was reading that over and i can't see where you originally said that was a new battery... be that as it may... have the alternator output check

  • Roberta Smith
    Roberta Smith Feb 02, 2009

    should be fine....

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