Here's a breakdown of troubleshooting steps, from least to most invasive:
1. The Obvious Checks:
* Wiggle the key: Gently wiggle the key back and forth while trying to turn it. Sometimes a bit of debris or misalignment is the culprit.
* Check for obstructions: Look closely into the keyhole for anything blocking the key's movement, like broken key pieces, dirt, or even a small piece of metal. Use compressed air (carefully!) to blow out any debris.
* Try a different key: If you have a spare key, try that to rule out a problem with the key itself. A worn or damaged key is a common cause.
* Steering wheel lock: Ensure the steering wheel isn't locked. If it is, gently try to move the wheel back and forth while turning the key.
2. Lubrication:
* Graphite powder: A very small amount of graphite powder (available at hardware stores) applied to the key and inside the keyhole can help lubricate the mechanism and free up a stuck tumbler. Use sparingly; too much can gum things up.
* WD-40 (use cautiously): WD-40 is a solvent and lubricant, but it can attract dirt over time. Use it only as a last resort before more serious solutions, and ensure you follow it up with graphite powder. Do not use excessive amounts.
3. More Involved Techniques (Proceed with Caution):
* Tap gently: With the key in the ignition, gently tap the ignition switch housing with a small hammer (wrapped in cloth to protect the surrounding area). This might help dislodge a stuck component. Use extremely light taps and only attempt this if you're comfortable with it.
* Remove the ignition switch (advanced): This requires removing the steering column shroud and potentially other components. It's a complex job best left to a mechanic unless you have experience with automotive electrical systems and disassembly. A damaged ignition switch might require replacement. This involves specialized tools and knowledge.
4. Professional Help:
If none of the above works, it's best to call a qualified mechanic or locksmith experienced with classic cars. They have the tools and expertise to diagnose and repair the problem safely and effectively. Trying to force the issue can cause irreparable damage to the ignition system.
Important Considerations for a 1974 Corvette:
* Age and wear: Parts in a 49-year-old car are likely to be worn. Replacement of the ignition switch or even the entire ignition column may be necessary.
* Electrical system: Be aware that you are working near the car's electrical system. Disconnect the battery's negative terminal before any major work to prevent accidental short circuits.
Remember safety first. If you're not comfortable working on your car's electrical system, seek professional help. A damaged ignition switch can lead to much larger and more expensive repairs.
