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2008 gmc envoy_denali
3 Posts
Discussion Starter · #1 ·
Just did these a week ago and although it took me about six hours of scraping and squeezing my fat hands into the engine compartment, My gas mileage has gone up!
If you do this, don't drop anything! There are some VERY hard to reach nooks and crannies right below the work area on the passenger side. Also, have a long and short socket extension, as well as a pivoting elbow. I found the slimmer profile on my craftsman wrench and it's ratchet switch to be far superior to my other wrenches.

Also, Auto Zone gave me a $3 per plug rebate on the ACDelco Iridium tip. So hurry up there and grab a few if you are thinking about doing it yourself!

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