GM 4.8L, 5.3L, 6.0L Index of Articles

Finding the exact cause of a misfire can sometimes be a challenge that can have you pulling out your hair (and spending money on parts that don't solve the problem). Why? Because anything from a BAD COP Coil to low engine compression can cause a...   read more >>

The mass air flow sensor on your 2003-2008 GMC Savana van or Chevy Express van can be easily tested in three steps and without a scan tool. All you need is a digital multimeter that can read Hertz frequency. At the bottom of this page you'll...   read more >>

This test tutorial will help you diagnose a P0120: Throttle Position (TP) Sensor 1 Malfunction with the Throttle Actuator Control (TAC) Throttle Body in a step-by-step manner using only a multimeter. In case you're wondering what the heck is...   read more >>

In this tutorial, I'm gonna' present to you my ‘Cheat Sheet’ of resistance values that I use to quickly test the Throttle Actuator Control (TAC) Throttle Body. This ‘Cheat Sheet’ is just a list of multimeter resistance...   read more >>

Testing the GM Coil-On-Plug ignition coils on your pick up truck or SUV is pretty simple and this article will show you just how to do it. Every step is explained in plain English and with photos to guide you every step of the way. So if your GM...   read more >>

Testing the Accelerator Pedal Positions (APP) Assembly, to see if APP Sensor 2 is bad or not, is not that hard. In this test tutorial, I'll help you diagnose a Accelerator Pedal Position (TP) Sensor 2 Malfunction diagnostic trouble code in a...   read more >>

This test tutorial will help you diagnose a Accelerator Pedal Position (TP) Sensor 1 Malfunction diagnostic trouble code in a step-by-step manner using only a multimeter. If you've done any type of research (before finding this tutorial), you...   read more >>