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how do you test coil packs?

Discussion in 'Stock 1991 - 1994 Explorers' started by 92xltriceeater, May 25, 2008.

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    1. 92xltriceeater

      92xltriceeater New Member

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      besides spark being totally absent how can you test coil pack? getting poor gas mileage and just did a full tuneup and wanna make sure my coil packs are still good and strong???
       
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    3. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    4. 92xltriceeater

      92xltriceeater New Member

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      key on engine off? while cranking?
       
    5. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    6. btprofessional

      btprofessional New Member

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      what should the resistance be?
       
    7. atistang

      atistang Active Member

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      idk, gm waste spark coil packs are like 40-60k ohms

      but you could always just compare them, if one is way off from the others then it is probably bad
       
    8. redneck21

      redneck21 Active Member

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      Get some on to sick a screw driver on it and crank it. If they scream then it's fine. Mint need 6 friends to check them all tho. lol
       
    9. seth247

      seth247 Well-Known Member

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      ^^^^^^^^^

      this test works pretty good.

      Dont forget to check the degree of burn on there hands. this can be a good indicator of coil condition.

      also make them sign a waver before hand. i forgot and the judge didn't seen to understand the logic behind my train of thought that led to the test.
       
    10. 91exploreron37

      91exploreron37 Well-Known Member

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      Anything less than a 3rd degree burn indicates a bad coil:D:rolleyes:
       
    11. redneck21

      redneck21 Active Member

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      You for got the smoking hair too.
       
    12. duke16

      duke16 Active Member

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      I have my coil packs off, but I'm confused as to how to check the resistance. My multimeter keeps reading "1" no matter what I do. What exactly do I touch to what?

      Thanks
       
    13. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    14. duke16

      duke16 Active Member

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      It's digital, but it has various ranges that need to be set manually.
       
    15. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    16. duke16

      duke16 Active Member

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      I tried them all.
       
    17. 90ranajo

      90ranajo The Little TJ that could Elite Explorer

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      1. Turn the ignition switch OFF, disconnect the battery, then detach the wiring harness connector from the ignition coil to be tested.
      2. Check for dirt, corrosion or damage on the terminals.

      PRIMARY RESISTANCE
      Use an ohmmeter to measure the resistance between the following terminals on the ignition coil, and note the resistance:
      1. B+ to Coil 1
      2. B+ to Coil 2
      3. B+ to Coil 3
      [​IMG]
      The resistance between all of these terminals should have been between 0.3–1.0 ohms. If the resistance was more or less than this value, the coil should be replaced with a new one.

      SECONDARY RESISTANCE
      Measure, using the ohmmeter, and note the resistance between each corresponding coil terminal and the two spark plug wire towers on the ignition coil. The coil terminals and plug wires towers are grouped as follows:
      1. Terminal 3 (coil 1) — spark plugs 1 and 5
      2. Terminal 2 (coil 3) — spark plugs 2 and 6
      3. Terminal 1 (coil 2) — spark plugs 3 and 4
      If the resistance for all of the readings was between 6,500–11,500 ohms, the ignition coils are OK. If any of the readings was less than 6,500 ohms or more than 11,500 ohms, replace the corresponding coil pack.
       
    18. duke16

      duke16 Active Member

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      Ah, well that makes more sense. Thanks.

      I got around 13.54 - 13.76 K between the 4 pairs. I compared those numbers to another set of identical coil packs and got numbers that were a little higher, 15.03 - 15.22 K. So seeing as the numbers on my coil packs were all in same ballpark and close to a set that a pulled of an Explorer that has no idle/hesitation trouble, are my coil packs OK?
       

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