Question about 2005 Hyundai Elantra

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Engine light flashing whole car shakes and motor sounds like a helacopter..... tested it and it said spark plug 4 misfired........... replaced all 4 spark plugs and it's still reading as a misfired spark plug

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  • Anonymous Mar 18, 2014

    misfire plug #4

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Sounds like it's either a coil pack or an injector to me, try switching the number four coil pack with any of the other coil packs if the miss follows the coil pack you need to replace that coil pack. if not it's either a fuel injector or a mechanical problem inside the motor, I would rent noid lights from a local auto parts store and look for injector pulse in the cylinder with a misfire, if the noid light is flashing it may be better to leave it to a professional as it is likely internal engine damage. hope that helps. chris

Posted on Feb 15, 2014

Testimonial: "Thanks Chris, I just took it down to auto zone to see if it was the spark plug wires, the looked fine...... but the guy said it could be internal too. he said it could be the coils...... but I don't know how to change them, i'm not much of a car buff"

  • Coreena Overbey
    Coreena Overbey Feb 15, 2014

    I also don't know where the injector is or how to find the pulse

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  • Hyundai Master
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Blocked exhaust system causing pressure to build up

Posted on Apr 11, 2015

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Posted on Jan 02, 2017

maklean
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SOURCE: Misfire on cylinder 1 and 3

Do you observe abnormal idle speed? It may be just an indicator fault; not a really engine firing problem.
Sign up free at link http://ww.hmaservice.com/
You will find a lot of technical information for your model.

Posted on May 20, 2008

ghost4548
  • 776 Answers

SOURCE: Changing spark plugs on 2007 Hyundai Sonata 4 cylinder

You are correct. The plugs are accessed below these coils. Disconnect the coil connectors and remove the 4 10mm bolts which hold the coils in place -- then you'll have access to the plugs. Here's a pic

4ff53b2.jpg By the way, how many miles on this 2007 Sonata? You know the powertrain is under warranty (1st owner 100,000 miles). If you're having problems, have Hyundai dealership diagnose it and fix it under warranty.

Posted on May 30, 2009

ghost45
  • 1280 Answers

SOURCE: Locating and changing spark plugs on 2007 Hyundai Sonata 4 cylinder

They are directly below the coil packs (10mm bolts).


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Posted on Oct 25, 2009

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