I am working on a friends car they just recently got and he went to change the spark plugs only to find out that it was cross threaded but I do t think the car even had 100,000 mi on it yet and the fact that as soon as they bought the vehicle two days later the check engine light came on and he has helped me in the past so I wanted to do him a favor and try to save home a lot of money seeing how he’s a retired Air Force veteran if anyone has any idea if this is something I can fix at home to avoid shop fees or advice. I did attach images I hope that they are able to be reviewed and someone has a good idea it’s a 2014 Chevy Cruz 1.4 straight 5 turbocharge with aluminum block I hope that the heads don’t have to be taken apart or that they don’t have to be replaced I am hoping that there is hope still seeing how the spark plug is still there and no damage was done
From the photos it seems like the spark plug is broken off which is not a good start.
If you are able to remove the old spark plug, you may use a thread repair tool matching the spark plug threads to repair them if that fails you need to replace the head.
In any case, please perform these tasks with the head removed from the block because any metal shavings dropping into the cylinder will damage the motor
While the correct approach would be to pull the head, this is not always cost-justified. If the car is not worth much, I would consider extracting the plug, and then using heli-coil or other insert to mate the cylinder head with a new plug. Use plenty of compressed air, and I would probably move the cylinder to near TDC, just to minimize the volume that you will be cleaning out.
To clean out, I would use compressed air, and a thin copper tubing extension, so that you can provide different directions of air. I would figure an hour to tap, and two hours to blow chips out, with a rag to catch any chips so that you get an idea as to how many you are getting out. You could also drop a magnetic pickup tool into the cylinder when you start to extract more of the steel debris.
Most of your chips will be aluminium, and the ones which stand a greater chance of scoring the cylinder walls are steel.