Replacing spark plugs and new ones wont go back in. Old ones were corroded but came out.<\/p>\n\n\n\n
First make certain your new plugs are the exact same as the old ones. See if you can install one of the old plugs and remove it. DO NOT cross thread the spark plug hole. But try to install the new ones again if they are the same as the old ones. If you are still having an issue return tot he store with both sets of plugs and ask for some that match your old ones. <\/p>\n\n\n\n
If you are unable to install the old ones or new ones because there is no longer any thread then you will need to repair it. This will require cutting new threads and installing a new insert. Here is the Plug Hole Repair kit <\/a>you will need to do it yourself. <\/p>\n\n\n\n