Do I change all four coils when I change one spark plug that is faulty

Question

My nephew changed my spark plugs and coils. I have a 2011 Buick Regal and one of the spark plugs blew when I started it, so he removed it and replaced it with an old Prius spark plug. I would like to know, should I change all of the coils? What could possibly cause it? The car doesn’t start immediately like it normally does.

Answer 1

You shouldn't need to change the spark plug coils unless they are faulty, so the answer to your question is no, you don't need to replace the coils again.

There probably wasn't a need to replace all of the coils in the first place. Maybe there was an ignition fault that your nephew decided it was just easier to replace all the coils and plugs to fix, but a bit more diagnosis may have identified the faulty coil.

Spark plugs are a service part, since they do wear out.

You really need to tell us what happened to the new spark plug. If it actually blew out of the spark plug hole, then this would indicate that the threads in the cylinder head that the plugs screw into may be damaged. If that is the case, then it will likely happen again and will need repairing properly.