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Old 09-10-2019, 02:21 AM   #38
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Join Date: Aug 2019

Originally Posted by Obi2winky View Post
Is this a common problem, spark plugs breaking inside?
I don't think it's a common problem but from my research it certainly has happened to more than one person.

I broke the new one while screwing it in...not the old one while screwing it out.

Originally Posted by Obi2winky View Post
I'm relatively new at doing my own maintenance work and I'm hoping to try changing the spark plugs on my 2012 Impreza for the first time soon. Unfortunately, I've neglected my poor car and it's got 180k miles on and its still the original plugs. Is there a torque limit that I should aim for? Maybe if the plug won't come out with a certain torque, I'll just take it to a mechanic before a I risk breaking it.
You could try PB blaster if it's stuck and you don't want to risk breaking the plugs using a breaker bar (or some other high-torque) rachet.

I just hand torqued the new ones in. I think the spec is like between 10-20 ft-lbs but I would do some research to confirm that first.
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