Skip to content
Trust My Mechanic
Trust My Mechanic

Your Free Car Repair Advice and Auto Repair Help

  • Home
  • About Me
  • Contact Me
  • A/C and Heater
  • Auto Repair Questions
  • Battery – Alternator
  • Brakes
  • Check Engine Lights
  • Coolant Leak
  • Exterior Care
  • Front End
  • Head Gasket Repair
  • Auto Insurance
  • Auto Loans
Trust My Mechanic

Your Free Car Repair Advice and Auto Repair Help

How To Tell If Spark Plugs In Car Have Been Changed?

Car Dude, October 13, 2023October 13, 2023


If you’re unsure whether the spark plugs in your car have been changed and you’d like to inspect them, you can follow these steps to help determine their condition:

  1. Check your vehicle’s maintenance records: The easiest way to find out when the spark plugs were last changed is to review your car’s maintenance records. This will tell you when the last spark plug replacement occurred.
  2. Look for visual signs:
    • Pop the hood of your car and locate the engine.
    • Locate the spark plug wires (or ignition coil-on-plug) and follow them to the spark plugs.
    • Carefully remove the spark plug wires or coils from the spark plugs. Be sure to do this when the engine is cool to avoid burns.
    • Examine the spark plugs. They should be clean and dry. If they’re covered in oil, carbon deposits, or other contaminants, this could indicate a problem.
  3. Check the spark plug gap: Use a gapping tool to measure the gap between the center and ground electrode on the spark plug. Refer to your vehicle’s manual or specifications for the correct gap. If the gap is not within the recommended range, it might be an indication of wear.
  4. Inspect the electrode condition:
    • The center electrode should be smooth and free from erosion.
    • The ground electrode (the bent one) should also be in good condition without excessive wear or erosion.
  5. Consider the mileage and maintenance schedule: Spark plugs have a recommended replacement interval based on mileage and vehicle manufacturer recommendations. If your car has exceeded this mileage or the recommended time frame, it’s a good idea to replace them.
  6. Listen to your engine: If your engine is misfiring, running rough, or experiencing poor acceleration, it could be a sign that the spark plugs are worn and need replacement.
  7. Smell the exhaust: If your car’s exhaust has a strong gasoline or unburned fuel smell, it may be an indication of inefficient combustion, possibly due to worn spark plugs.
  8. Consult a professional: If you’re uncertain about the condition of your spark plugs, it’s best to have a mechanic or automotive technician inspect them. They can provide a more accurate assessment and replace the spark plugs if needed.

Keep in mind that spark plugs can wear out at different rates depending on factors like driving conditions, fuel quality, and the type of spark plugs used. Regular maintenance and following your vehicle’s recommended service schedule will help ensure that your spark plugs are changed when necessary to keep your engine running smoothly and efficiently.

https://youtu.be/n-gheoNP5bc?si=SzNaV4gMND_MTM0o

Related Posts:

  • How to change spark plugs and wires
  • How to connect spark plug wires to coil
  • How to change spark plugs and wires : A Step-by-Step Guide
  • How to Change Spark Plugs in Your Vehicle
  • SYMPTOMS OF BAD SPARK PLUGS
Auto Repair Questions

Post navigation

Previous post
Next post
  • (no title)
  • Front and rear Brake Pads and Rotors
  • How do disc brakes work in cars and light vehicles
  • How do hydraulic brakes in cars and light vehicles work 3D animation
  • Look at How Far my Project Car has Come in a Year
  • 7 Things You Shouldn’t Do In an Automatic Transmission Car
  • How to Change EVERY FLUID in your Car or Truck 
  • 10 Winter Car TIPS & TRICKS you NEED to Know
  • How Much Weight can you REMOVE from your Car?
  • What Happened to the LEMONS BMW?
  • What it Actually Takes to Race a $500 Car for 24 Hours!
  • How to Install Windshield Wiper Brakes
  • How to Replace a Hybrid Battery in a Prius
  • How To Install A Flex Fuel e85 Conversion Kit In Your Car
  • How To Fix A Leaking Rear Axle 
  • How to Install Windshield Wiper Brakes
  • How to Perfectly Maintain Your First Car
  • How To Make Your Car Last A Long Time – Simple Checks
  • 12 Things To Check Before Buying A Used Car
  • Priced for Perfection: The World’s Most Expensive Cars
  • How To Drive A Manual Transmission + Rev Match + Heel Toe Downshift
  • How to Buy a Car To Flip for a Profit 
  • How to Buy a Used Car Interior and Exterior Inspection
  • How to Inspect a Used Car for Purchase

©2025 Trust My Mechanic | WordPress Theme by SuperbThemes