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Troubleshooting
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Why Won't My Car Ignition Switch Turn?
Why Won't My Car Ignition Switch Turn?
Introduction
An ignition switch is designed to utilize a key that controls the
main electrical
switch in your car. This switch controls the engine starter, main control
systems and other various systems. The key is used to keep unwanted users
from operating the vehicle. This key and lock are much like any other lock and
key assembly. All lock assemblies have a periodical maintenance schedule. This
lock service includes cleansing of the key and internal lock assembly. After the
cleaning maintenance has been performed a small amount of lock lubricant should
be added to the internal lock tumbler. The car ignition lock is subject to
pressures and vibration through normal usage. When this condition occurs the key
switch will not operate, this could mean the switch will need to be replaced.
There are various other conditions can cause the ignition switch not to turn, we
have listed the most common ones below.
 
READ COMPLETELY BEFORE BEGINNING!
- Step 1 - Most cars have
power steering, the
power steering uses hydraulic pressure to assist the driver in steering the car. When the engine
is shut off the hydraulic pressure is relieved. If the steering wheel is turned
when the car is shut off the "lock pin" that holds the steering wheel in one
place is now under pressure. Place your hand on the steering wheel and pull
it in one direction and then the other while turning the ignition switch. This
should release the lock pin and allow the switch to operate properly. (Note:
always shut the car engine off when the steering wheel is in the straight position)
- Step 2 - Dirt and debris inside the key lock can cause
the tumbler assembly to malfunction by not allowing one or more of the key
followers to operate. Protect your eyes and use pressurized air to clean the
internal lock mechanism. Next, clean the key with a mild detergent and dry.
Then use a lock lubricant and move the key in and out of the lock tumbler
while trying to turn it.
- Step 3 - The ignition key is designed to hold the key
followers in the correct place to allow the cylinder to turn. If the teeth
of the key wear down it will not operate the lock properly. Try a spare key
in the lock, if a spare key works the lock, have copies made of that key and
discard the key that doesn't work anymore.
- Step 4 - A car with
an
automatic transmission utilizes an
interlock cable that holds the car in park when the key is in the off position.
If the gear shift selector is not completely in park it can cause the ignition
switch to malfunction. Check the gear selector to make sure it is completely
in the park position.
- Step 5 - The ignition switch has many components; on some
vehicles the actual ignition switch is down on the steering column and connects
the key and tumbler by a mechanism. If this mechanism or the switch fails it
could cause the key switch not to turn. To repair this problem disassemble the
steering column and repair or replace the broken parts as needed then reassemble
and recheck.
WARNING! Always have the vehicle under inspection on level
ground, in park with the emergency brake on. Always wear protective eyewear, gloves
and necessary clothing before inspection or work begins. Never crank an engine over
when anyone is near the battery or engine. Always have an operational fire extinguisher
close by, obey all first aid instructions in the event of an accident. Never stand
in front or behind a vehicle when cranked over or running. When engine is cranked
over keep hands and clothing free from rotating components.
Troubleshooting
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Why Won't My Car Ignition Switch Turn?
Additional Resources
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Stalls at Idle Questions and Answers
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