Question about Hyundai Motor 2003 Elantra

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2003 Hyundai Elantra It sounds the backfiring

2003 Hyundai Elantra It sounds like the backfiring noise that has been happening might be coming from the back. A few responses so far said it may be a sensor,my fuel pump,or even the transmission...Hopefully my mechanic will look at this tomorrow for me...I went after work today but he was too booked...I had the transmission fluid checked today and its full. This backfiring sound has been going on for the last 10 weeks or so...If it was the tranmission don't you think it would have gone by now. The noise doesn't happen all the time though. Most of the time that it happens is when I am driving locally and not on the highway. Please advise

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At first blush, sounds like the knock sensor making the car misfire. Other possibilities are:

  • fouled spark plug; might not notice it at idle but would misfire at higher speeds; check the plugs as well as the valve cover gasket for oil seepage
  • if you've noticed a sulphur smelling exhaust or excessive heat from the exhaust, it could be the catalytic converter (more likely if there is high mileage on the car). Another symptom would be very bad performance and poor gas mileage.

Posted on Jul 22, 2009


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2003 Hyundai Elantra It sounds like the backfiring noise that has been happening might be coming from the back. A few responses so far said it may be a sensor,my fuel pump,or even the...

Doesn't sound like transmission, but lets wait & see what your mechanic finds, as it's hard to tell with description your giving , but I know your telling all you can. If your doubtful at all with his diagnosis, all you have to do is say , you'll need time to think about it, and perhaps get back to us, or stop elsewhere for a second opinion.
Good Luck, let us know.

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