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?... [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... [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... [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... [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... [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... [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... [read more]