In this this tutorial, I'll show you one of the ways to test for a BAD fuel injector by doing a fuel injector resistance test.
Since the 4.7L V8 engine is equipped with 8 fuel injectors, I'll also show you a specific diagnostic strategy you can use to find the or BAD fuel injectors.
Here are the contents of this article at a quick glance:
The three most common ways that a fuel injector fails are:
No matter what the root cause, a BAD fuel injector will cause the engine to idle rough and miss when you accelerate it down the road.
What throws a ‘wrench into the works’... is that the PCM won't always set a specific fuel injector trouble code. But if it does, you'll see one of the following:
From personal experience... I can tell you that around 90% of the time, when you do have a BAD fuel injector, you'll see a misfire trouble code:
And well... the other symptoms your vehicle may experience are:
To do a fuel injector resistance test, you don't need a whole lot of stuff, since the most important tool you'll need is a multimeter (which can either be an analog multimeter or a digital multimeter).
Here's a basic list of tools you'll need:
“For instance, on the planet Earth, man had always assumed that he was more
intelligent than dolphins because he had achieved so much —the wheel,
New York, wars and so on —whilst all the dolphins had ever done was
muck about in the water having a good time. But conversely,
the dolphins had always believed that they were far more
intelligent than man —for precisely the same reasons!”
The Hitchhiker's Guide to the Galaxy