Fuel Injector Resistance Test (1990-1996 4.0L Ford Ranger And Mazda B4000)

Important Precautions When Removing The Intake Manifold Plenum

If you need to remove the intake manifold's plenum to get to the three fuel injectors underneath it, keep in mind the following suggestions:

  • Be careful that no foreign object, like a bolt, a nut, or any metal piece/part, falls into the open manifold port runners.
  • After removing the plenum, place a clean rag or rags on the open intake runners. These rags will keep things from falling into them.
  • As you're removing bolts, nuts, etc., from the intake plenum, place them in a container and away from the engine compartment.

If anything falls into the open intake runners, without you knowing, and you start the engine, you're going to be in a big world of hurt! Since you'll need to remove the cylinder head(s) to retrieve the part that fell in. So be alert and be careful.

Removing the plenum is not an out-of-this-world thing that no one can do since it's done around the country in many shops without complications or unhappy endings by simply following some precautions.

One last thing, when you reinstall the plenum, use new gaskets. Install these gaskets without any sealant, like RTV silicone. Using a sealant like RTV silicone may cause vacuum leaks down the road, and you're back to square one (removing the plenum).

More 4.0L Ford Ranger (Mazda B4000) Tutorials

You can find a complete list of 4.0L Ford Ranger (Mazda B4000) tutorials in this index:

Here's a small sample of the tutorials you'll find in the index:

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Ford Vehicles:

  • Ranger 4.0L
    • 1990, 1991, 1992, 1993, 1994, 1995, 1996

Mazda Vehicles:

  • B4000 4.0L
    • 1994, 1995, 1996