Skip the auto shop - Our mechanics make house calls

Q: When Should Engine Spark Plugs Be Replaced?

asked by on

When should engine spark plugs be replaced?

Regularly scheduled spark plug replacement should follow the prescribed manufacturer’s recommendations listed in your owner’s manual.

With today’s advanced ignition systems and use of exotic materials, spark plugs can live for about 100,000 miles before requiring replacement.

Other reasons to replace your spark plugs would include:

  • Repair of engine misfire issues
  • Worn plugs due to high mileage, long-term storage, or engine performance malfunctions
  • Poor fuel economy
  • Emissions test failures

This is not a comprehensive list by any means.

Spark plugs are vital to the proper operation of your engine. I have personally worked on several vehicles that had close to 250,000 miles on them before coming into the shop for repair. All of the ignition system components (spark plugs, plug wires, ignition coil, distributor cap and rotor) were original to the vehicle and they too had nearly 250,000 miles of wear on them. Needless to say, with the amount of neglect these vehicles showed, the engines were totally worn out and had to be replaced.

Replacing your spark plugs when necessary will help keep your engine running well, get the most mileage from every tank of fuel, and keep those pesky emissions at their lowest levels. Should you need any help with replacing your spark plugs, contact a professional mechanic who can service your vehicle at your convenience.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car not turning left or right

This is most likely a problem with the electronic steering lock. When you insert the key into the ignition slot the steering wheel should unlock, via an electric motor in the steering column. If this motor malfunctions, the wheel will...

Q: timing belt

Timing belts are not generally condemned and replaced on the basis of visual "inspections". Rather, vehicle manufacturers set forth specific replacement schedules, based on both elapsed time and engine mileage, and the belt is simply replaced "on schedule". This is...

Q: Can the wrong spark plugs cause problems like popping noise under the hood ? And cause the car the shit off?

To answer your question in one word - YES, the wrong spark plugs or incorrect spark plug gap can and often will cause a vehicle's engine to misfire or run incredibly inefficient. However, the issue of the vehicle shutting off...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...