Thermo
technical advisor
- Joined
- Apr 18, 2011
- Posts
- 1,407
- Reaction score
- 65
Soldier, I would first recommend doing a visual inspection of the top of each of your COPs. If you look at them, you will see a clear top to them. If you see a white line in any of them (the white line means there is a crack in the epoxy top), you are getting a little bit of water inside the coil and it is affecting the amount of spark, leading to the misfire. I would first check 3 COPs though as they are the most likely suspects (in order of most likely to fail): #4, #3, #7. The two on the passenger side are tucked in a low air flow area and they tend to get really hot, which will lead to their failure. #7 (driver's side) is right under the EGR piping. ANother one that sees a lot of heat.
After that, odds are you are looking at having to pull each COP and seeing if the rubber boot is in good condition and not shorting through the boot to the wall of the plug tube. I have heard that roughly have of the "bad COPs" were attributed to bad rubber boots. If you talk with your local auto parts store, you can buy just the boots.
After that, odds are you are looking at having to pull each COP and seeing if the rubber boot is in good condition and not shorting through the boot to the wall of the plug tube. I have heard that roughly have of the "bad COPs" were attributed to bad rubber boots. If you talk with your local auto parts store, you can buy just the boots.
