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coil pack

  1. Second replaced coil pack in one month

    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...
  2. 2003 GMC Envoy XL Coil Brand important?

    I am getting misfire error codes and sure enough one of my coils is damaged and must be replaced. Question is... Have any of you had bad experiences with 3rd party coils that are not AC Delco? Auto parts is charging me over $120 each coil and online i see some places charging about $160 for ALL...
  3. Cylinder #5 Ignition Coil Bolt

    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. Cyl 6 misfire/ coil pack problem

    OEM Issues
    I have searched and havent been able to find a solution. I have been dealing with a cyl 6 misfire that I have not been able to solve. A while back i changed spark plugs and the cyl 6 spark had a bit of rust but hadnt been misfiring at that point. This morning a felt ambitious and went under the...
  5. Rough Idle / How do I Check a coil? / TCCM

    OEM Issues
    Hello everyone, and thanks in advance! '02' Envoy SLT 4.2L I-6 90,000 (bought it from my sister 2 yrs ago it's been babied) And I Love it! I've had some common problems. Battery went dead shortly after I got it. It set the "service 4WD" light Installed new Battery, tried all the tricks had to go...
  6. Misfire after a number of fixes

    OEM Issues
    Whats up, I am having problems with the 05 Tb. I have changed my spark plugs, cleaned my throttle body and changed 2 coil packs and I am still getting a p0300 error. Also, if I get the rpm's over 2k the ses flashes. I have stopped driving it. It all started when it was pouring down rain and...