I Wanna Go Fast

This morning my spark plug shot out the engine and through the coil. Replaced both the plug and coil. A few mins ago same thing happened same cylinder. WTF is happening?!

SpiderX1016

Were you able to thread the new spark plug in and torque it to spec?

Turbonut

iTrader: (1)

Chances are the spark plug threads are gone.

I Wanna Go Fast

the weird thing is the new plug wouldnt tighten up in that cylinder so I took one from another cylinder and it went in fine. I need to know why this is happening in the first place in the same cylinder?

SpiderX1016

Either bring it to a Mechanic or take the head off and bring it to a machine shop, they may be able to repair the threads with the head still in the car so check with them first.

pohljm

threads are gone! it can be repaired without removing the head but it takes skill and experience. make sure you have that available, or pull the head.

I Wanna Go Fast

Sent it to the dealer...$120 to re-thread it. I just wanna know how this happens

SpiderX1016

That's not too bad of a price imo.

Over time, the spark plugs get loose and/or poor assembly from the plant.
When they get loose, what usually happens is the combustion gasses go up into the threads and fuses the spark plug to the head and when you go to pull out the plug. You'll pull the threads along with the plug if you're not patient.

The plug shooting out is a little more rare to see but it happens. So take out all the coils and check the other spark plugs to see if they're tight, unless the dealer does it for you.