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GMC Yukon XL and Yukon XL Denali

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#3963 of 4070 Re: Real world MPG [odysseyhunter] by nogmc Mar 08, 2006 (12:30 pm)
Replying to: odysseyhunter (Feb 10, 2006 8:26 pm) No way does a Denali get 15 to 19 mpg, no one makes a 5.7 liter engine with that fuel economy in the real world. You cannot use the cars computer to determine your mpg, you have to do it the old fashioned way. Run through a tank of gas fill it up and divde the miles driven by the # of gallons just entered. I have a Yukon XL and have never gotten more than 13 mpg city or over the road. On top of everything else these cars have terrible service records, run through brakes and tires and are not safer than a Honda Oddysey. In fact these larger trucks are less safe because people feel they have more protection and drive more hazardously. Obviously only thinking about their safety and not the guy they just ran into. Good luck.
#3964 of 4070 Tire change by ahightower Mar 15, 2006 (8:49 am)
Well I learned the value of OnStar, without even using it. I had my first flat tire. Not a blow out, just a slow leak due to a big nail.   Man, what a hassle to change the tire. I'm sure it will be easier and faster the next time, but the first run through was a challenge. That little jack sure moves slowly doesn't it? Like twenty turns to move it one inch. And at first, the spare tire didn't want to come all the way down, there is some sort of "catch". The manual said to try cranking it back up again until you hear two clicks. If that doesn't work, you have to balance the jack on the tire blocks and raise it up to release some lock or something. Luckily, it came down on its own eventually. Then once it was down, it took me a while to figure out how to turn that bracket just right so it would fit through the wheel.   I've learned my lesson - practice changing the tire on a new car in your free time so it's not a hassle and a completely new experience when you're in a real hurry. I really have been meaning to, but it's been a busy 7 months...   So I am definitely going to renew OnStar when it comes due. I hate to think of my wife trying to change a tire on her own. Much more laborious and time consuming than doing a donut on a regular car. She watched me do it and understands how it works, but it takes a long time. I hate to think of her working on the side of a busy road for so long, or in a parking lot attracting the attention of strange men. And truck tires are heavy (surprise surprise)! It was hard even for me to lift the spare into place, and then to get the flat up inside the back. If she's alone, I'd rather she just call for roadside assistance. Heck, I'd call OnStar myself if it was raining. I hate to look like a wimp, but that job takes a long time. You're going to get soaked, and you absolutely have to get down on the ground to place the jack and get the spare out.   Overall, I am impressed with the new vehicle. This is my first large SUV. The storage system for the spare is a neat design. It's a full size spare, and you can store the flat in the same place after changing. It has a lock that prevents other people from stealing the spare tire. And the TPMS is great. I had the kids loaded up and was ready to drive off when it warned me that I was low, down to 17 psi. I'm glad this is becoming a standard feature on new vehicles.
#3965 of 4070 Re: 2002 Yukon XL [isaace] by stldenali04 Mar 15, 2006 (12:44 pm)
Replying to: isaace (Dec 09, 2005 8:16 pm) I've got a 2004 Yukon XL Denali and am having to have the transmission relpaced at 43k. Dropped the car off at the dealership and within 5 min. got a call stating the problem and that they had contacted GM and GM would cover the repair less a $500 deductible. I don't even have an extended warrantiy. Talked to a fellow at the dealership 2 mo. ago who had a '04 Envoy who had has his tranny replaced at 15k and was having problems again at 30k. Sounds like GM knows there is a problem but doesn't want to announce a full scale recall. Replies to this message: tdoh (Mar 17, 2006 1:52 pm)
#3966 of 4070 Re: Yukon XL Cold Start Engine knock [terryasullivan] by gapjs40 Mar 16, 2006 (1:03 pm)
Replying to: terryasullivan (Jun 10, 2005 9:31 am) Since you were the only person to reply to the former message let me try this on you. Have you had any problem with stalling when slowing down. We know it's electrical but don't know if it is the ignition switch or what. WE also had to replace the fuel pump.   Thanks for the reply. Replies to this message: terryasullivan (Mar 20, 2006 11:48 am)
#3967 of 4070 Re: 2002 Yukon XL [stldenali04] by tdoh Mar 17, 2006 (1:52 pm)
Replying to: stldenali04 (Mar 15, 2006 12:44 pm) Man you got me worried--I own an '04 DXL too...on the "bright" side, I do have an extended warranty. But still...the fact that you have the same model and year as mine; I'm at 35k miles right now, and the thing that concerns me is that according to the tranny temp gauge, it doesn't take too long for my tranny to go past 150. After around 30 minutes or so of steady driving, it's in the 170 range...and that's even with an ambient temp in the 50's, and no towing or other heavy load.   Just curious--what kind of tranny temps do you get in your truck? I know it'll vary somewhat depending on outside temp, so if you could provide tranny temps at different outside temps (no tow, little or no cargo load)...I'd appreciate it! I ask because everywhere else I've read/asked, other folks say that their tranny temps hardly reach 150 even on a decently-warm summer day.   Thanks!
#3968 of 4070 Reply to gapjs40 - stalling when slowing down by terryasullivan Mar 20, 2006 (11:48 am)
Replying to: gapjs40 (Mar 16, 2006 1:03 pm) I have not had this problem, but it sounds like one the the symptoms of a bad 'crankshaft position sensor'.
#3969 of 4070 Re: Real world MPG [odysseyhunter] by racermd Apr 15, 2006 (4:46 pm)
Replying to: odysseyhunter (Feb 03, 2006 9:59 am) I've got an '04 DXL and drive somewhat conservatively with an occasional thrill launch. That gets me roughly 14 MPG combined city/highway (about a 50/50 mix). However, your average MPG will vary greatly depending on what your city/highway mix will be. The Denali doesn't do so well around town as you might guess. It's a heavy vehicle that needs lots of power to get moving. Once it's moving and at-speed (such as a long highway ride), there's not much else that needs to keep it going.   I ran a round-trip from Minneapolis to New Orleans and got an average of just over 20 MPG! Even my "old" '01 Silverado couldn't get that.   The trick is to keep your speed from being excessive but also keeping it steady.   Also, keep in mind how much you're going to enjoy and spend on the vehicle in the long-run. There are much more imortant factors than simple fuel economy, even if your priorities might be tilted in that direction.
#3970 of 4070 What's the deal on trailer brakes? by 05yukonxl Apr 25, 2006 (10:25 am)
Does my '05 Yukon XL have a built in controller for trailer brakes? I recently rented a tandem axle trailer with a 7 pin wiring harness and was informed by the rental place that my Yukon controlled the trailer brakes. Is this true? Why are there aftermarket brake controllers if this is true? What does the "trailer brake" wire in the 7 pin harness do if it is not controlling the trailer brakes?   I routinely tow a 3000 lb. boat/trailer with surge brakes and it seems to work fine. Is there a reason to do anything differently? Replies to this message: terryasullivan (Apr 27, 2006 9:19 am) 05yukonxl (Apr 27, 2006 11:24 am)
#3971 of 4070 Re: YUKON PROBLEMS SHOULD BE RECALLED [gapjs40] by microstream Apr 26, 2006 (8:02 pm)
Replying to: gapjs40 (Nov 23, 2005 7:05 am) Knocking sounds: try amsoil high performance synthetic lubrication. The oil had a drain life of 35K miles. Grinding: probably front wheel bearings. Stalling: likely a failing fuel pump. Squeal: likely A/C compressor. Replies to this message: microstream (Apr 26, 2006 9:41 pm)
#3972 of 4070 Re: YUKON PROBLEMS SHOULD BE RECALLED [microstream] by microstream Apr 26, 2006 (9:41 pm)
Replying to: microstream (Apr 26, 2006 8:02 pm) Here's a list of recalls for the 2000 GMC Yukon XL:   http://www.autosite.com/content/own/service/index.cfm/action/RecallsView/seriesi- d/17581   Others can be referenced from the same site.

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