There can be several reasons an ignition key will not turn. To give an accurate and useful answer requires more in depth knowledge of a particular situation, but here are a few possibilities.
Step 1
Apply pressure to the key and turn the wheel back and forth to attempt to find a free spot where the key turns. The steering column lock can be in a bind and exert pressure against the ignition mechanism.
Step 2
If you have an automatic transmission, check and make sure the selector is in park. Some cars will prevent you turning the key if the selector is in any position other than park or neutral.
Step 3
Clean and lubricate the lock cylinder. Spray a liberal amount of electrical contact cleaner to flush away dirt and grime, followed by a quick spray of silicone or a drop or two of liquid graphite to lubricate. Be careful not to allow it to drip on upholstery or carpet. Keep the car open to prevent accumulation of fumes, and avoid sparks and open flames.
Step 4
On some lock cylinders, a tumbler may bind in a locked position, and the springs are unable to to push it back out. Firmly tapping the face of the lock cylinder can release the stuck tumbler. A tack hammer is about the perfect size and weight for most key cylinders.
Step 5
Place the key on a very flat, solid surface, and observe if it lays flat or is arched up from the surface either at the ends or in the middle. If it is, take a block of wood, or some similar hard object which to strike the key and bend it back to a flat shape. Do not use a hammer or other steel or hard metal object, the key is made of fairly soft metal such as brass, and the grooves may be damaged when it is struck.
Tips
- The order of situations and possible remedies is from most to least likely.
- You may be tempted to force the key..as in gripping it with a pair of pliers, but the metal of the key is soft and breaking or twisting the key will not solve the problem.
- On several Ford vehicles, you might need to turn the steering wheel in one direction or the other while turning the ignition key. This is because of a weird column locking mechanism that prevents the key from being turned if its locked.
Warnings
- Never use oil or grease on lock cylinders. Oils attracts dirt and dust, and will prevent the tumblers from moving as needed to unlock. Use only dry lubricants such as silicone, graphite or other products specifically designed for lubricating locks.
- Never clean lock cylinders with products that leave a film or residue. Films and residue are usually oils and will attract dirt. Electrical contact cleaning products work great on lock cylinders and leave no film or residue.
Things You'll Need
- Electronic cleaner (quick drying formula)
- Graphite lube (dry powder - extra fine)
- Paper towel or rag for clean-up
- Tack hammer (if applicable)
