Fuel Injector Resistance Test (1997-2000 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:

  • As you're removing bolts, nuts, etc., from the intake plenum, place them in a container and away from the engine compartment.
  • After removing the plenum, cover the open intake runners with clean shop towels (or clean rags). The shop towels will keep things (like a bolt or nut) from falling into them.

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!

Removing anything that has fallen into the open intake runners (after you've started the engine) will require the removal of the cylinder head(s). So be alert and be careful.

Removing the plenum can be done without complications or unhappy endings by simply following some precautions.

One last thing, if you 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