I am not sure if it is better to remove them when the engine is hot or cold? The reason I am asking is I am doing A tune up and had some problem with the replacing the plugs and one is really in there and I am afraid of the stuck plug braking or striping out. So what is the best way to appro…

Removing spark plug in aluminum cyl,head

pleasedodgevan December 28, 2008, 5:24am 8

The Haynes manual for the 2002 GMC Sierra says to allow the engine to cool completely before removing the plugs. I guess you can then install the new ones at any temperature…