Since I retired over 4 years ago, I don't do a lot of work on cars, but I still do some, and I try to keep up on whats going on. On my wife's 2004 Buick Rainier, same as the Chevy Trailblazer, and GMC Envoy, with 4.2 leter 6 cylinder engine. It had an issue wi... Login to read more.