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Chevy Trailblazer spark plug replacement 4.2 I6

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Uploaded on Sep 18, 2011

A how-to video for replacing the spark plugs in a Chevy 4.2 I6 engine.

Always use AC Delco 41-103s in this engine. Yes they cost more then the $1.99 Autolites at Walmart but using other plugs can wipe out the ignition coils.

https://www.amazon.com/ACDelco-41-103...

NOTE: The AC Delco 41-103s are pregapped from the factory. That's why they have the plastic sleeve things in the box, so the gap won't change during shipping and handling. For what it's worth, I have replaced hundreds of the delco iridium plugs and haven't gapped a single one.

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