GM 4.2L Index of Articles

The spark plugs on your 4.2L Chevrolet TrailBlazer or GMC Envoy are designed to last a very long time. But as the engine wears and it accumulates lots of miles, you're... [read more]

In this tutorial I'm going to show you how to test the engine compression on the 4.2L equipped 2002-2009 Chevrolet TrailBlazer or GMC Envoy. The engine compression test... [read more]

Testing to see if your 4.2L Chevy Trailblazer or 4.2L GMC Envoy has a blown head gasket is not difficult at all. In this tutorial I'm gonna' explain the four most common... [read more]