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ignition coil

  1. 2013+ Chevrolet Trailblazer Forum
    2003 Trailblazer lt 4.2, cylinder 3 started misfiring a couple weeks ago and I determined the ignition coil for that cylinder went bad by first unplugging #3 coil and noting there was no difference in how rough the engine was running then unplugging #2 to note how much rougher it ran with two...
  2. OEM Issues
    About a month ago we got a check engine light and very rough idle. The code indicated misfire on cylinder 4. I replaced the spark plugs and cleaned the throttle body, but that didn't help at all. I then replaced coil pack # 4 and it worked fine. I cleared the code and it didn't come back. A few...
  3. General
    As I was replacing the coil pack on cylinder #5, my worst nightmare happened....the bolt broke. The space is too small for me to get a drill and extractor into. I was thinking of just RTVing or gluing the coil pack down and calling it good. Any thoughts? Ideas? Appreciate the insight! Chris
  4. General
    Hello all... New guy here with what I'm hoping are not major 2005 Trailblazer (4WD) issues. Background on problems: Approximately 2 weeks ago we had several days of subfreezing temps here in Louisiana. The 2005 Trailblazer had not been run during this period and had sat idle for +/- 10 days...
  5. General
    Does anybody have any experience or advice on how to remove a broken ignition coil bolt (cylinder 6). It snapped while I was installing the new coil. Is the bolt required for grounding? If not, could I just place some gasket sealant around the flange of the coil and call it a day?
  6. OEM Issues
    It started with my 05 TB turning on the check engine light. I checked the code, and it mentioned something about the knock sensor going off. I checked around and decided to replace the spark plugs in the truck. When that was done, I though everything was fine, except coil pack 4 and 6 didn't...
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