Question about 2004 Honda Civic

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I have noticed my 2004 Civic vibrates a bit when I first start it and also when the a/c is on and I am not driving. Then the check engine light came on yesterday. Could that be related to the vibrating? What could it be and is it expensive to fix???

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Vibration in 4 cyl. vehicles is more common than in 6 and 8 cyl. engine vehicles. However, the check engine light might indicate that something is wrong in the ignition or emission system that could cost a significant amount to repair or fix.

I would have the system scanned for the codes to try to find out what exactly is wrong with the engine, whether it is a bad sensor, or bad ignition, or what not.

Today's car computers can detect hundreds of things that are possibly wrong with an engine/ transmission combination.

Posted on Aug 29, 2010

  • 3 more comments 
  • sonyag08 Aug 29, 2010

    Agh! Not the answer I wanted! One more question. I just noticed that my gas cap was not all the way screwed on when I put gas in my car today. The check engine light came on the day after I got gas the last time. If that was the problem, how long would it take the check engine light to turn off?

  • Duane Wong
    Duane Wong Aug 29, 2010

    The gas cap problem can be cleared with an OBD-II Scanner, or after about 40 or so cycles of starting the engine and shutting off the car if it's like a GM.

    Sears sells an OBD-II scanner for about $59 to $100 that can clear codes.

    Walmart sells one for about $98 that I bought that clears codes and describes in English which sensor is faulty or being tripped.

    OBD-II is a system of diagnosing used on 1996 and above vehicles.

  • Duane Wong
    Duane Wong Aug 29, 2010

    The gas cap problem may take less than 40 cycles of turning on and turning off the engine, I think, since that's a more common problem than other types of errors found in the computer system.

    But, I've never had a Honda that I have personally forgotten to screw the cap on tightly, and cycled it until it stopped showing up as a check engine error before. Just read about other people having this problem and rectifying it by screwing it back on and having the code cleared as soon as possible.

  • sonyag08 Aug 29, 2010

    Great, thank you for your help!!! I pray it's just the gas cap thing!!

  • Duane Wong
    Duane Wong Aug 29, 2010

    I hope it's just a gas cap not being screwed on tightly, because if it's something else that mimics this problem, like a leaky filler neck or something like that, then it could be more difficult to repair.

    However, I think that the rough idle doesn't really have anything to do with the low pressure in the gas tank, as a result of a loose gas cap, for instance.

    There probably is something else wrong causing the rough idle.



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