2008 GMC ENVOY check engine

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Page 267 of 468

GMC ENVOY 2008  Owners Manual Hill and Mountain Roads
Driving on steep hills or through mountains is different
than driving on �at or rolling terrain. Tips for driving
in these conditions include:
Keep your vehicle serviced and i

Page 270 of 468

GMC ENVOY 2008  Owners Manual You can run the engine to keep warm, but be careful.
{CAUTION:
Snow can trap exhaust gases under your
vehicle. This can cause deadly CO (carbon
monoxide) gas to get inside. CO could
overcome you and k

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GMC ENVOY 2008  Owners Manual Driving with a Trailer
{CAUTION:
If you have a rear-most window open and you
pull a trailer with your vehicle, carbon monoxide
(CO) could come into your vehicle. You can not
see or smell CO. It can ca

Page 291 of 468

GMC ENVOY 2008  Owners Manual Passing
You’ll need more passing distance up ahead when
you’re towing a trailer. And, because you’re a good
deal longer, you’ll need to go much farther beyond the
passed vehicle before you can

Page 293 of 468

GMC ENVOY 2008  Owners Manual When You Are Ready to Leave After
Parking on a Hill
1. Apply your regular brakes and hold the pedal down
while you:
start your engine,
shift into a gear, and
release the parking brake.
2. Let up on

Page 295 of 468

GMC ENVOY 2008  Owners Manual Service............................................................5-3
Accessories and Modi�cations..........................5-3
California Proposition 65 Warning.....................5-4
California Pe

Page 299 of 468

GMC ENVOY 2008  Owners Manual If you want to do some of your own service work, you
should use the proper service manual. It tells you much
more about how to service your vehicle than this
manual can. To order the proper service ma

Page 300 of 468

GMC ENVOY 2008  Owners Manual Gasoline Octane
Use regular unleaded gasoline with a posted octane
rating of 87 or higher. If the octane rating is less than 87,
you might notice an audible knocking noise when you
drive, commonly ref