Expert: Skip Bollinger - 3/16/2007

Question
When I tried to turn my car off the key wouldn't turn. It's like its locked. I finally had to disconnect the battery to get it off. It's stuck in start though. Is it the ignition or do you know? It's a 91 chevy blazer

Answer
Blair,
  Please let me preface with this: I'm a Parts Specialist, NOT a Tech. Okay?? With that being said, here we go..
  I'm a bit confused about your situation. Am I to understand your key will NOT turn? IF that is the situation, it is probably the lock cylinder. It is a rare situation but it could be the ignition switch also. To determine the culprit, you can disconnect the + battery cable. Next, unplug the ignition switch located on the steering column by the brake pedal. Unscrew the ignition switch and hold it in your hand. Try to move the lever on the switch. It is connected to a rod that runs up to your lock cylinder. IF it moves forward and back, it probably is okay and the problem in in the lock cylinder.
  Once you determine the problem (lock cylinder or ignition switch), you will need to tell your parts store if you have a K-5 Blazer or an S/T10 Blazer.
  In closing, one thing you said bothers me. You said you disconnected the battery to kill the engine. This action may have detrimental actions on the computer in the truck. Also disconnecting the battery should not kill the engine as it would still run off the alternator voltage...??? I'm not trying to open a can of worms but it may be too late.
  Good luck in your venture. I hope what I have offered is helpful. Just remember, I'm a Parts Specialist, NOT a tech. Thank you for your question.
Skip