2006 gmc envoy denali 5.3, no oil leaks, 61000 miles, steady vacuum gauge reading at 16, runs and starts very good. Takes 1 quart of oil per 1300 to 1500 miles, no exhaust smoking. Why so much oil ?

Question edited for clarity.
Question moved to model category.

Here are all your fuses

GMC Envoy (2002-2009) fuses and relays

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Hi Bryce, For the miles and engine in your vehicle, a bit of visible smoke from the tailpipe on cold start is normal. It indicates a small amount of engine oil is leaking past the "valve-guide seals" in the cylinder head. For now, I wouldn't let it concern you too much because it's actually a VERY small amount of oil making its way into the combustion chamber while you're snoozing.

It only takes a drop or three to produce a huge amount of visible smoke when it burns, and it probably won't even leave deposits on your spark plugs at this point.

This condition isn't harming anything except your nerves, and it won't cause a breakdown or leave you stranded. The oil lost (per mile) is too small to result in the need to check the dipstick more often, but you should get a sense of the loss-rate by periodic checks over a given number of miles.

Top off your oil, and check it every two or three fill-ups, and, my guess is, you won't have to add a quart before driving 1000-1500 miles, which is nothing to worry over, but determine how many miles it takes to use a quart, so you know when to add.

If you want to narrow it down, pop the plugs out and check for any light colored deposits, and note the particular cylinder from which a contaminated plug was removed. You'll probably see little, if any, deposits for now.

Oh, and there are NO magic snake-oil remedies, despite fancy promises on the labels of opportunistic, quick-fix makers. Don't fall for their distractions. The best you can do is to keep up on your oil maintenance. Running dirty oil causes accelerated seal wear.

Happy Motoring!!!

Last I looked around 14 ft lbs. I advise you to convert to inch pounds and evenly tighten as per manual bolt sequence in three steps. I will mention you should double check my memory... I am fairly certain 12 to 18 ft lbs, but just the same go to youtube for a bid showing the correct method of torquing bolts.
For what it is worth many parts stores will let you get a peak at a manual.

GMC Envoy problems and GMC Envoy repair histories -- car repair descriptions reported ... by car, to see how many repairs each car required and where the car is located. ... 5.3L V8; 2006 291-horsepower 4.2L I6; 2005 275-horsepower 4.2L I6; 2004 ... Advised by OnStar not to drive and have it towed. ----------------------------------------------
galletto 1260

Its your Throttle body going bad.. $400.00 at dealership

That is strange. Do not rule out the possibility that you have a leak somewhere in the vehical. I would check this out immediately, or it is going to cost more in the long run. Check the oil pan and the ground where you park your vehical.

A rod problem is a steady knock which increases with rpm. More likely you have a plugged air filter , a plugged fuel filter or a vacuum leak, ( vote fuel filter , people never change those often enough)

Oil Pressure Test Check for proper oil pressure at the sending unit passage with an externally mounted mechanical oil pressure gauge. A tachometer may also be needed, as some specifications may require running the engine at a specific RPM.

1. While the engine is cold, locate and remove the oil pressure sending unit.
2. Following the manufacturer's instructions, connect a mechanical oil pressure gauge and, if necessary, a tachometer to the engine.
3. Start the engine and allow it to idle.
4. Note and record the oil pressure reading when the engine is cold. The engine may need to run at a specified RPM, if so check the vehicle's specification.
5. Run the engine until normal operating temperature is reached.
6. Check the oil pressure reading again with the engine hot and record the value. Turn off the engine.

Compare the hot oil pressure reading to the specification. If the reading is low, check the cold pressure reading against the specification. If the cold pressure is well above the specification, and the hot reading was lower than the specification, the engine may have the wrong viscosity oil. Change the oil, making sure to use the proper grade and quantity, and then repeat the test.
Low oil pressure readings could be attributed to internal component wear, pump related problems, a low oil level, or oil viscosity that is too low. High oil pressure readings could be caused by an overfilled crankcase, too high of an oil viscosity or a faulty pressure relief valve.

At 40K miles it shouldn't burn that much oil, unless the motor has been abused or overheated. With no signs of oil leaks, the engine must be burning it via the exhaust,

Change the oil (use a good quality oil) and then observe oil consumption.

If it still uses excessive oil check further as below:-
1) if it blows blue smoke on steady accelleration (pistons or ring wear),
or
2) only blows blue smoke on initial accelleration after a period of steady coasting or de-celleration (faulty valve stem oil seals).

No it is not normal to lose two quarts,Have you seen any oil spots on the ground where you park your Envoy,
take a look under your Envoy to see if you have a small leak and the air from driving it is blowing the oil back towards transmission.