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Spark Plug Replacement at your home

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Spark Plug Replacement Service

How much does a Spark Plug Replacement cost?

A Spark Plug Replacement is usually between $100 to $200, including the cost of labor. The price will depend on the type of vehicle you drive.

What do Spark Plugs do?

Spark plugs are one of the key components of your vehicle’s ignition system. They light up gasoline and air inside of your engine. This gives your engine the power to drive you down the road. The spark plug receives high voltage electricity from the ignition coil and generates a spark at just the right moment during the engine’s combustion cycle. This provides the engine the best mix of power, fuel economy and low emissions. However, the electrode at the end of the spark plug eventually wears out and can produce performance issues.

How often do you need to change spark plugs?

Replacement should follow the vehicle maintenance schedule. You should change your spark plugs every 50,000 km for most vehicles. It is likely in some cases that a spark plug might fail before the service schedule, but that’s rare.

It is also suggested that you change your Spark Plug Wires at the same time, or you may still encounter misfires or other problems.

Bad Spark Plug Symptoms:

  • Trouble starting your car.
  • Examine engine light for a misfire code.
  • Flashing check engine light during acceleration for misfire, this can result to engine damage.
  • Reduced fuel economy and/or power.
  • Rough idle and/or inexplicable engine vibration.
  • Failed emission testing.
They should always be changed in sets even if only one spark plug is found to be faulty. Most engines will require 4,6, or 8 spark plugs.

How to change spark plugs:

Spark plugs are threaded into the engine’s cylinder head(s). Most cars have one plug per cylinder, so a four-cylinder engine will have four plugs; a six-cylinder engine will have six plugs, and so forth. The mechanic will:

  • Have the precise spark plugs on hand for your vehicle
  • Pull any diagnostic trouble codes that may be associated to worn spark plugs.
  • Take out the original spark plugs and look at removed spark plugs for any clues indicating engine mis-operation exists, such as excessively rich mixture, pre-ignition damage, oil burning, etc. Notify owner of any found unusual conditions.
  • Install new plugs using a torque wrench.
  • Finally, a road test of the vehicle to approve normal operation.

Is it safe to drive with worn spark plugs?

Yes, however, spark plugs that are worn enough to cause engine-misfiring have the possibility to cause overheating of the catalytic converter and engine damage. If the engine misfires or runs inefficiently, the plugs must be examined for defects regardless of the age of the plugs or mileage. In general, spark plug failure will not keep the engine from running, but in cases of extreme wear, you may experience a limitation in the speed at which you can drive the car. If the maintenance schedule suggests the plugs should be changed, it is best to do so on time.

Spark Plug Replacement Reviews

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