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EricFromCT, ASE Certified Technician
Category: Acura
Satisfied Customers: 3958
Experience:  ASE Master certified L1, L2, Diesel Certified 16 years experience
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My 2005 MDX, the ignition coil broke off and I can't get it

Customer Question

my 2005 MDX, the ignition coil broke off and I can't get it out.
Submitted: 2 years ago.
Category: Acura
Expert:  EricFromCT replied 2 years ago.
Hi. So did the hold down bolt break, or did the ignition coil break causing the boot to remain stuck in the cylinder head?
Customer: replied 2 years ago.
The boot.
Expert:  EricFromCT replied 2 years ago.
The boot can be very stubborn especially when broke. What works best is a pair of long needle nose pliers and grab the outside of the boot and twist it to break it free then get a firm grip on it and pull it out. Let me know if that works for you. Thanks.
Customer: replied 2 years ago.
I have been using the needle nose for over two hours along with vise grips, WD40 and various screwdrivers. Have you ever done this on this car? Until I get the core out you can't pick at the sides. Then at some points something must be melted, then what?
Expert:  EricFromCT replied 2 years ago.
Yes I have encountered this on this car before. You did not mention the coil was melted. That actually is a bigger problem then just a broken coil. More than likely the engine computer, ECU, has faulted and caused the coil to stay on for too long and melted it. This sometimes "fuses" the coil to the plug. I have seen instances when the spark plug threads in the cylinder head have become damaged when this happens, and the plug comes out with coil. Other times I have seen the coil and plug be so melted together that they can not be removed. You need to chisel away, or try and destroy the piece of the coil to get it out.
There is a very good chance that the cylinder head will have to be removed, and even possibly replaced, and the ECU replaced to complete this repair. Please respond with your thoughts or further questions on this.
Customer: replied 2 years ago.
Of no help, provided no insight.