Tips For Testing Your Vehicle’s Fuel Injectors – F150

If you own a Ford F 150, which utilizes a 4.6L engine, you may run into a fuel injector problem. Remember that this specific model is equipped with 8 individual fuel injectors and it is more than possible for each to malfunction separately. Grab yourself a multi-meter, because it’ll make the process tremendously easier. Once you’re ready to go, you’ll want to proceed to the information below.

Signs Of A Problem

Diagnosing a bad fuel injector isn’t overly difficult, but the symptoms can align with other problems as well. Below, you’ll find a list of things to look for, when attempting to identify the problem.

  • Decreased power
  • Vehicle hesitates, when you begin to accelerate
  • Vehicle idles erratically and roughly
  • There are numerous trouble codes associated with this unique problem. They include P0300 – P0308.

It is possible for the injectors to become clogged to the point that they’re unable to inject a sufficient amount of fuel. On the other hand, the internal coil winding may short out, which will prevent the injector from injecting any fuel all together.

Inspecting Internal Resistance

If you believe the injector has stopped injection fuel all together, you’ll want to check its resistance. This simple procedure will help to confirm your assumption. Be sure to grab your multi-meter. Remember that a properly working fuel injector will maintain a resistance rating of 11 to 18 Ohms. Once you’re ready to go, you should follow the steps below to check each and every one of the fuel injectors.

  • All fuel injectors should be removed from their wiring harness connectors
  • Set the Multi-Meter to the Ohms mode
  • Take the measures and write them down

If one of the injectors has failed to produce the proper resistance, you’ll need to replace it immediately.

Locating A Clogged Fuel Injector

If you inspecting the internal resistances of each injector and they checked out fine, you will want to try and diagnose a clog instead. Although each mechanic will have a unique procedure that they follow for this unique problem, the most effective will be provided below for your consideration.

  • First and foremost, you’ll need to locate the dead cylinder. You can utilize a scan tool to obtain a misfire code to help you identify the problematic cylinder.
  • Carefully inspect the cylinder’s fuel injector. Make sure that it is not damaged in any way. Unfortunately, this is a common occurrence with 4.6L Ford engines.
  • If everything checks out, you need to check and make sure the fuel injector is receiving a spark. Be sure that the spark plugs are clean and not dripping with engine oil or carbon residue.
  • If the cylinder is receiving a spark, you’ll need to carefully inspect its compression. Make sure that the engine has the appropriate compression.
  • If the compression is good and the cylinder receives a spark, you’ll need to perform a fuel injector Noid light test. You’ll need to acquire and utilize a Noid Light to help you perform this check.

If you’ve made it this far and all of the checks above discovered nothing out of the ordinary, you’ll want to switch out the problematic injector for its neighbor. If the misfire continues, despite this change, you’re dealing with a clogged injector. In order to rectify this problem, you’ll need to thoroughly clean or replace the injector.


-Henry Avera

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