Question about 2008 Hyundai Accent

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Bad coil pack, fouled plugs, bad sparkplug wires

Malfunction indicator light came on a few days ago while driving, then noticed car was sluggish on acceleration and making sputtering noise. computer diagnostic shows PO300, PO303, PO304

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  • Susan Oct 30, 2012

    the spark plugs have not been changed ever and the car has 71K miles... i know this model doesn't have plug wires, so maybe the plugs just need replacing or maybe bad coil pack??? car has not had any problems previously and then malfunction light came on...

  • teds repairs
    teds repairs Oct 30, 2012




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There is a lot issue with this motor with the po300,po303 ,po304 . it has the do with the head and valves. you need to found out which cylinder is mis firing

Posted on Oct 30, 2012

  • 6 more comments 
  • Susan Oct 30, 2012

    the spark plugs have not been changed ever and the car has 71K miles... i know this model doesn't have plug wires, so maybe the plugs just need replacing or maybe bad coil pack??? car has not had any problems previously and then malfunction light came on. it is a steady light and only flashes when first starting car then just remains lit.

  • Susan Oct 30, 2012

    also i drove the car today for the first time since the light came on a few days ago. car cranks fine just sputtering and low on acceleration. shop i called wants $80/hr to diagnose the codes... wtf

  • teds repairs
    teds repairs Oct 30, 2012

    ok that would answer it. change the spark plugs,but do not go cheap. In my shop I go close to factory spark plugs .please keep me updated

  • teds repairs
    teds repairs Oct 30, 2012

    this is the link to my garage and I am on facebook. if you want I can walk you through it,and you can change your own spark plugs or this one

  • Susan Nov 01, 2012

    hey ted. thank you. i bought a socket set and spark plug puller and changed the spark plugs (boy, do i feel empowered now...LOL) and also put some lucas fuel injector cleaner in my tank. light is still one but car does seem to be running some better. i swear i hear something that sounds like a loose vacumn hose but checked them all and can't find it., also when i jiggled a few of them yesterday, the light went off for a minute or two. i'm guessing i should go ahead and replace the pcv valuve with the mileage i have on the car, it couldn't hurt. the coil packs are $89 bucks apiece so i'm trying the less expensive options first.. your thoughts?

  • teds repairs
    teds repairs Nov 01, 2012

    Good morning Susan. That is good,and I was going walk you through changing thespark plugs..I did see the coils are very costly,but I can get them little cheap.Like to add you to my facebook,and stay up dated with your problem. If you go to my garage page and leave a comment I can add if you want.What did the old plugs look like.were they white on the ends. thank you Ted

  • Susan Nov 01, 2012

    k, will go to your page. the old spark plugs weren't white on the end, more of a tan, rusty color...

  • teds repairs
    teds repairs Nov 01, 2012

    when you are on my page just leave a comment or e mail and I will add you



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