and gain access to Reviews and Discussion of the 2016 and 2017 Ford Explorer Tech Tips, How to Articles, Off-Road Modifications and Events, Street Truck Mods and Events, and much more! Since 1996 our community has covered every aspect of the Ford Explorer, Ford Ranger and all vehicles based on this platform.

Register Today It's free! This box will disappear once registered!

How to accurately test ignition coil pack

Discussion in 'Stock 1995 - 2001 Explorers' started by mikepier, February 11, 2009.

  • Searches ExplorerForum.com
    1. mikepier

      mikepier Active Member

      Joined:
      December 24, 2008
      Messages:
      287
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Long Island, NY
      Year and Model:
      99 XLT
      I have a 99 XLT, I'm trying to troubleshoot a slight rough idle problem. I suspect it might be the coil pack. I tested it according to the Haynes manual, it says you should get this:

      Terminal 3 (coil 1)-spark plugs 1 and 5
      Terminal 2 (coil 3)-spark plugs 2 and 6
      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.

      But I'm consistently getting a reading of more like 13,000 ohms on each terminal. Is this normal? Anyone else get the same readings?
       
    2. Support EF


      Join the Elite Explorers for $20 a year

      Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose and fix problems yourself, and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no ads, add your own profile photo, upload photo attachments directly to your posts and Media Gallery, create more private Conversations, and more. Join Today. Your support is greatly appreciated.



      to hide adverts.
    3. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

      Joined:
      November 11, 2005
      Messages:
      50,868
      Likes Received:
      18
      Trophy Points:
      58
      City, State:
      Brooklyn, NY
      Year and Model:
      88 89 93 95 96 Aerostars
      If Haynes says that it's out of spec, and you are experiencing a rough idle, then I think this might be the answer. Check the resistance of a new coil before you buy it to compare your readings.
       
    4. mikepier

      mikepier Active Member

      Joined:
      December 24, 2008
      Messages:
      287
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Long Island, NY
      Year and Model:
      99 XLT
      Thanks, I think I found my problem. Was not the engine at all, it was the muffler. look for my post on how I found it.
       
    5. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

      Joined:
      November 11, 2005
      Messages:
      50,868
      Likes Received:
      18
      Trophy Points:
      58
      City, State:
      Brooklyn, NY
      Year and Model:
      88 89 93 95 96 Aerostars
    6. Orleans

      Orleans Member

      Joined:
      October 5, 2010
      Messages:
      90
      Likes Received:
      0
      Trophy Points:
      6
      Year and Model:
      2005 Ford Explore Limited
      Hi,

      I used this image for the test and the figures obtained were not accurate, they were swinging, it's normal?

      Thanks

      [​IMG]
       

    Share This Page






    We Support Our Troops!