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  • Life of ignition Coils

    Hi, Can anyone tell me what the general life span of ignition coils are?

    My 2004 V6 prado has been misfiring (mainly when under load at low revs) recently and my mechanic mentioned there was water in one of them when I had the 200000km service undertaken. The problem was still apparent for a couple of hrs afterwards then no issues. Considering where I take the vehicle to remote places I am thinking of changing all coils just to be safe and considering it has done 200000km.

    I got a price of $175ea from Toyota and Repco closer to a $100 for variouse brands…

    Any help is much appreciated

    Thanks,

    Nick

  • #2
    Originally posted by damicon View Post
    Hi, Can anyone tell me what the general life span of ignition coils are?

    My 2004 V6 prado has been misfiring (mainly when under load at low revs) recently and my mechanic mentioned there was water in one of them when I had the 200000km service undertaken. The problem was still apparent for a couple of hrs afterwards then no issues. Considering where I take the vehicle to remote places I am thinking of changing all coils just to be safe and considering it has done 200000km.

    I got a price of $175ea from Toyota and Repco closer to a $100 for variouse brands…

    Any help is much appreciated

    Thanks,

    Nick
    Electronic components that can fail, but the Toyota ones are pretty good.
    Keep your plugs changed as per schedule it will help look after the coils.
    It only takes a little water, if they didnt quite get it all out, the rest may have evaporated.
    If it was soaked for a while, rusty/corroded on end? I'd replace the one......
    If they start playing up for no reason, misfiring etc, first it's plugs, if t plays up still you throw a set of coils at it.
    The good news is your not going to break down if 1 plays up.
    Maybe carry 1 spare? Easy to swap.

    I'd say 200k is a point where they are more likely to play up.
    I've had vehicles with much lower Klm's paying up, but then most will be fine for much longer.
    It was more ignition leads I could say change them every 100,000klms, but they are all but gone.
    Coils is a fix as it fails deal.

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    • #3
      If you get the ones from Repco and the part # starts with ÌGC--- they come from a supplier Premier Auto Trade and will be genuine ND coils even in Toyota Packaging.

      Comment


      • #4
        I know the factorh service manual for my 90 says replace plugs, coils and leads every 40k , I have only just replaced the originals at 180k
        2018 GXL 2.8 1GD,

        Comment


        • #5
          G'Day guys and thank you for your responses. Sorry for the delayed response.

          So since I posted the above. I still had more misfiring and rough idling issues. I then decided to purchase a whole set of new coils even though cylinder 1 coil seemed to be the culprit.

          Upon changing the coils with relative ease, I got to the last one being cylinder 1. This was the most difficult to access. I immedietly noticed it was not tightened correctly from the previous service and subsequently found they cross threaded the bolt holding it in. I then found the base of the head of the ignition coil had been partially but substantially broken off, thus creating virtually no seal. So it was clear that this is what caused the water to enter in the first place. You think the mechanic would have told me of this since the whole reason for the repair was because of water ingress within the ignition coil tube. No!. Then I realised they were the first to change the plugs for the very first time in a previous service, hence it was broken by them and they did not tell me.

          I then checked the spark plug in this cylinder and it just did not look to be a two week old (1000km) spark plug. Especially when I saw the water line still on it from the previous problem. I mean had they replaced the plug, any residual water within the tube after blowing out of the tube using compressed air, would have fallen in the combustion chamber by gravity. It just does not make sense to me and does immedietly raise suspicion.

          The engine now fires nicely since I changed the coils and a new plug in cylinder one.

          I am now in discussions with the mechanic and am gaining professional opinions on the age of the plug I had removed that was supposedly brand new. I may be wrong, though, I have every reason to investigate further at this point. Not only that, they caused the problem in the first place by breaking the seal of the coil.

          To date three mechanics have look at the plug and suggested that in no way is it 1000km old.

          Many thanks for any further feedback…

          Nick
          Last edited by damicon; 03-06-2015, 06:05 PM.

          Comment


          • #6
            Sounds pretty dodgy.

            If you can accurately pin it on them, hit them for the coils & all. Looks like they (butchers) have caused your grief.
            Toyota coils are usually very good. You really have to watch who you let work on your vehicles.
            Water is usually involved with any misfiring that is not normal, eg; a commodore will misfire without water, the coils do fail = normal lol.....

            Comment


            • #7
              I d be pulling out all the plugs to photograph them side by side , the old one should stand out , pride in good workmanship is lost or few and far between these days
              2018 GXL 2.8 1GD,

              Comment


              • #8
                Originally posted by brissy View Post
                I know the factorh service manual for my 90 says replace plugs, coils and leads every 40k , I have only just replaced the originals at 180k
                I have my spark plugs replaced every 80,000-100,000km and never had an issue.
                My wife's previous car was a Kia Rio and it was throwing a coil pack every 10,000km almost after it reached 150,000km. It was still perfectly drivable, just that it'd miss on occasion. We'd get the ignition system tested and the coil pack replaced within a week, then the same issue again 10,000km later.
                Brett1979
                Avid PP Poster!
                Last edited by Brett1979; 26-06-2015, 07:17 PM.
                2005 120 series V6 Grande, 2 inch susp lift (King/EFS combo), 32 inch MT’s, Safari Snorkel, rear diff lock, breathers, Light Force spotlights, UHF, dual batteries.

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