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How To Perform A Compression Test On Your Ford Mustang

Last Updated 7/10/2020 by Taylor Ward

Performing a compression test on your Mustang can be a very helpful tool when checking for bad compression. Check out LMR's easy and thorough steps.

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How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang

  1. Start by disconnecting the negative battery cable.
  2. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  3. Spray the engine bay with compressed air. This will include isolating the area around the coil on the engine.
  4. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  5. Remove the intake tube from the passenger side of the engine.
  6. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  7. We chose to remove the idle air and TPS sensor connectors to help free up some extra room.
  8. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  9. Disconnect the coil and injector harnesses.
  10. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang

    How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  11. Now you can remove the 8mm bolts holding the coil in place.
  12. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  13. Remove the coils from the vehicle and set aside.
  14. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  15. Spray off the spark plug holes one last time to ensure all dirt and debris is removed.
  16. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  17. Remove all of the spark plugs from the cylinder head.
  18. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  19. Now install your compression gauge on the number 1 cylinder.
  20. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  21. Reconnect the negative battery terminal. The point here is to have the engine turn over, but not start. This is also why we disconnected the injectors earlier.
  22. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  23. When moving inside the vehicle, start by pressing the accelerator pedal all the way to the floor. This puts your vehicle into clear flood mode which cuts all the fuel to the injectors.
  24. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  25. To make sure of no accidental startup, turn the key and make sure you spin the engine over at least four complete cycles. This will ensure all valves open and close properly.



  26. Document your reading on the gauge, clear your gauge, and move on to your next cylinder.
  27. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang


  28. Once completed, reinstall all components and check your work. Check our numbers below and also keep in mind you want all of your numbers around the same.
  29. How To Perform A Compression Test On Your Mustang - How To Perform A Compression Test On Your Mustang

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About the Video

How To Perform A Compression Test On Your Mustang

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Published on 2020-06-26
Have you ever wanted to check your Mustang for bad compression? Then follow along as Jay walks you through each step of figuring out if you've got an issue or if everything looks good!
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Due to factors beyond the control of LMR.com, we cannot guarantee against the improper use or unauthorized modifications of this information. LMR.com assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. LMR.com recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of LMR.com, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not LMR.com.