GM 4.2L Index of Articles

This tutorial will explain how to test the crankshaft position (CKP) sensor on the 2002-2004 4.2L Olds Bravada and on the 2004-2007 4.2L Buick Rainier with a... [read more]

This tutorial will explain how to test the accelerator pedal position (APP) sensors with a multimeter (no expensive diagnostic test equipment needed). Your test results... [read more]

APPLIES TO: This simplified TAC system wiring diagram applies to the following vehicles: 4.2L Buick Rainier: 2004, 2005. 4.2L Oldsmobile Bravada: 2002, 2003,... [read more]

You can easily and accurately test the accelerator pedal position (APP) sensors on the 2002-2003 4.2L Oldsmobile Bravada with a multimeter resistance test. In this... [read more]

As you're probably already aware, TPS 1, TPS 2, and the TAC motor comprise the electronic throttle body on the 4.2L Oldsmobile Bravada and Buick Rainier. The cool thing is... [read more]

This tutorial will walk you through the ignition coil testing process step-by-step on the 4.2L Oldsmobile Bravada and 4.2L Buick Rainier. With your test results you'll... [read more]

A blown head gasket can be diagnosed by performing one of four tests and in this tutorial, I'll explain how to perform them step-by-step. You'll quickly and easily find out... [read more]

APPLIES TO: This simplified TAC system wiring diagram applies to the following vehicles: 4.2L Buick Rainier: 2006, 2007. You can find the 2004-2005 4.2L Buick... [read more]

Testing the head gasket on the 4.2L Oldsmobile Bravada (Buick Rainier) is not difficult. In this tutorial, I'll explain how to perform the four most common blown head... [read more]