Can an IGBT be intermittent?

Discussion in 'Automotive Electronics' started by NMNeil, Jun 18, 2019.

  1. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
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    What he said.
     
  2. NMNeil

    Thread Starter New Member

    Jun 18, 2019
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    While waiting for my repaired PCM to arrive I took a closer look at the coil from cyl #6. Primary and secondary resistance was well within specs, no sign of arcing or burning. Took a closer look with a 40X jewelers loupe and discovered that the epoxy sealing the connector to the top had a small crack all the way round the perimeter. Looking closer I found a hairline crack, difficult to see even at such high magnification, running from the connector to the center of the coil. I pulled the other 2 coils from the front bank this morning and they are both showing exactly the same cracking.
    So despite being within specs for resistance something is obviously very wrong inside the coil. Not even going to check the rear bank, just changing them all out.
     
    narkeleptk likes this.
  3. bwilliams60

    Senior Member

    Nov 18, 2012
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    Good choice in changing all your coils. Well worth the money and time. I don't warranty a PCM repair on Fords if customer chooses not to replace with OEM new coils. I don't even warranty them with aftermarket coils because they are sure to fail as well.
    On another note, any chance you have any pics of these cracks in the coils? I would be interested in seeing the cause of the problem. Moisture obviously takes part in this equation by the sounds of it.
     
    Last edited: Jul 3, 2019
  4. NMNeil

    Thread Starter New Member

    Jun 18, 2019
    14
    2
    I'll try and get some photos but the macro option of my camera is not so good.
    I've been researching coils and it's a minefield. Amazon have OEM Motorcraft coils for sale at around $40 each but many of the reviews say they are Chinese knock offs, not the real thing. Just out of interest I checked to see who actually makes Motorcraft coils and it seems the OEM is Denso, and they are made in the Denso factory in China!. So it seems that whatever the brand of the coils it's going to be made in China either at an official OEM factory or a local counterfeiting factory.
    Gone are the days when you would find a "Made in the USA" label on auto electric parts.
    Given the pot luck situation I ordered a set of aftermarket coils ($49 the set with a 2 year warranty and good reviews) I'll just make sure I change the plugs and coils out every 6000 miles or so.
     
  5. bwilliams60

    Senior Member

    Nov 18, 2012
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    Speaking from experience, I think you are going to spend more money on repairs and frustration than what those OEM coils would have cost you. I hope I am wrong for your sake but knockoffs never pan out. There is a reason they are cheap. It can be as simple as the wire or core they use to the fillers that they use for the plastic which will take on water like the Titanic. Let us know how you make out.
     
  6. NMNeil

    Thread Starter New Member

    Jun 18, 2019
    14
    2
    My point was that even if you buy the new, branded Motorcraft coils you still have no guarantee that they are the genuine Denso made in China version.
    When all is said and done the path of least resistance will be to get the car running then sell it, so the whole coil PCM issue becomes someone else's problem.
     
  7. bwilliams60

    Senior Member

    Nov 18, 2012
    1,125
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    When you buy OEM, they are built to specific standards and you know you are buying something made for the vehicle. When you buy a knockoff, it is a reverse engineered product with inferior parts. It does not matter that they are both made in China. One has standards and one does not, that is all I am trying to say. I was not aware that you were going to fix it and then sell it off. Just trying to save you some cash in the long run. All good, carry on. Poor pity the guy buying it lol.
     
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