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[QUOTE=stanigu;546128]So I got CEL code indicating misfire on cylinder 4, and the car was hesitating on low RPM under load.
I had replaced all the ignition coil less than 1000 miles ago with Beru coils. I pulled the one from cylinder 4 out, and saw that it was cracked badly!
I replaced it, and the car runs fine now. But I was wondering what might cause this...just a defect, or is there a root cause that I should look into?
Hard to tell from your picture, but that kinda looks like it was not seated properly on the plug then tightened down with the plug hard against the edge of the extension opening and the localized pressure caused the fracture. Is the extension straight or bowed? and is there any indentation at the point of the crack? Anyway that appears to be a stress fracture and not a defect. My .02.
Last edited by 911monty; 08-04-2017 at 10:17 PM.
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