Someone tried to steal my 90 GMC and broke the plastic steering column cover to gain access to the ignition mechanism on the left side of the steering column. A part of the starting mechanism was broken and now I can’t turn the key. The key cylinder doesn’t look damaged. I hear these vehicles are easy to steal with only a screwdriver to pull back on the mechanism and then the vehicle starts. Do you think that the damage to the mechanism is causing the key to not turn? I have a replacement kit for the mechanism and cover but not the ignition tumbler. Thank you for your help.
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You should be able to remove the key and tumbler assembly and test the action to see if it needs to be replaced.
You can also check the rod with the tumbler assembly removed. One push forward would unlock the steering wheel, and so forth.
While I’m thinking about it, You did try wiggling the steering wheel back and forth to make sure it wasn’t just bound up a bit???