Ford 4.0L Index of Articles

Bench testing the Ford 4 or 5 pin relay is not hard to do at all, and in this article I'll show you how to do it (there are two articles in site about bench testing a Ford... [read more]

Every now and then, the need arises to bench test a Relay to find out if it's really bad or not. This article will help you to bench test the Ford 20 amp multi-purpose... [read more]

Testing the alternator on your 4.0L V6 Ford Ranger (Mazda B4000) isn't hard. The best part is that you don't need any expensive testing equipment. This tutorial will... [read more]

The fuel injectors are one of the most challenging components to test on your Ford Ranger or Mazda B4000's 4.0L V6 engine. What makes the test a challenge is the fact that... [read more]

Confirming that your 4.0L Ford Ranger (Mazda B4000) has a blown head gasket problem is not difficult. In this tutorial, I'll explain four easy tests you can perform to... [read more]

In this tutorial, I'm going to explain in a step-by-step manner how to do an engine compression test. I'm also going to explain how to interpret its results. You'll... [read more]

Testing the upstream Oxygen Sensors (O2S11 and O2S21), on your OBD II equipped 4.0L Ford Aerostar, Explorer, Ranger, or Mountaineer,... [read more] at:

One of the most common problems, with MAF Sensor equipped Ford (Mercury and Lincoln) vehicles, is that the MAF Sensor’s Hot Wires... [read more] at:

You can easily test the starter motor with a few simple tools. In this tutorial, I'll share my starter motor testing method. You'll quickly find out if the starter motor is... [read more]

If you've been wondering if it's possible to test the thermostat (without replacing it on a hunch), the answer is YES! The Thermostat... [read more] at: