Fuel Injector Tutorial Summary

In this section, I want to give you some personal experience input, on how to diagnose a bad fuel injector on your 2.4L Nissan Frontier (or Altima or Xterra). These are my basic troubleshooting tests and I usually follow them in this order:

  1. Check for misfire codes.
    1. Unfortunately, the PCM usually doesn't set a specific bad fuel injector code, but when a fuel injector does go bad, you WILL see a misfire code.
    2. This is when owning a scan tool comes in handy.
  2. Check for spark.
    1. I do this, to make sure that the COP ignition coil or spark plug wire is not bad and the cause of the misfire problem.
  3. Check the condition of the spark plug(s).
    1. I do this by removing the spark plug of the dead cylinder and check it for cracks and/or carbon tracks.
  4. Check engine compression.
    1. This is a fast and easy test but is so often overlooked.
    2. You can find this test here: How To Test Engine Compression (Nissan 2.4L).
  5. Check fuel injector resistance.

So, the gist of all of the above testing, is to eliminate all of the most common problem areas that can cause a miss (after all, when a fuel injector goes bad, you'll have an engine miss).

If everything checks out, and the internal resistance of the fuel injector is not within the average resistance value of the other 3, I now have the confidence to buy a new one.

More Nissan 2.4L Test Articles

You can find all of the Nissan 2.4L test articles here: Nissan 2.4L, 2.5L Index Of Articles.

Here's a sample of the tutorials you'll find in the Nissan 2.4L Index:

  1. How To Test The Starter Motor (Nissan 2.4L -Frontier, Xterra).
  2. How To Test Engine Compression (Nissan 2.4L).
  3. How To Troubleshoot A Blown Head Gasket (Nissan 2.4L, 2.5L).
  4. How To Test The Throttle Position Sensor (1996-1997 2.4L Altima) (at: easyautodiagnostics.com).
  5. How To Test The Power Transistor 2.4L Nissan Frontier, Xterra (1998-2004) (at: easyautodiagnostics.com).
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Nissan Vehicles:

  • 240SX 2.4L
    • 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
  • Altima 2.4L
    • 1993, 1994, 1995, 1996, 1997, 1998, 1999
  • Frontier 2.4L
    • 1998, 1999, 2000, 2001, 2002, 2003, 2004

Nissan Vehicles:

  • Pick Up 2.4L
    • 1996, 1997
  • Xterra 2.4L
    • 2000, 2001, 2002, 2003, 2004