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http://www.caranddriver.com/article.asp?section_id=4&article_- - - id=3604&page_number=1
FWIW, my previous vehicle, a '92 BMW 750iL (12 cylinder), returned 2 mpg better with regular unleaded than with premium. The car did not require premium per BMW, but when I bought the car I figured it should get premium. After talking to other owners, I was convinced to move back to regular fuel. I'm glad I did.
In such a circumstance, I like to get an authoritative statement in writing (such as a TSB) as opposed to one's opinion.
I run a lot of Chevron reg in my 2001 Denali and getting very decent mileage. Just returned from a weekend to my cousin's on Harstine Is.; about 90% hwy, but it was hot running the AC and 70mph for the most part, I got 17.4mpg(17.3 on the DIC)
I haven't tried comparing running reg with premium, but see no need.
http://www.chevron.com/prodserv/fuels/techrongas/faq.shtml
tidester, host
The clock on the NAV is satellite based, but your required to cycle the power on the vehicle after changing time zones for the change to take effect. Another irritating pain when traveling from St. Louis to Denver. Another unusual ‘feature’ of the NAV system is that the 6-disk changer cannot be used by the second row while another source is playing thru the main system. This requires the removal of the NAV disk to insert a cd for your child in the back so you can listen to the ballgame. This results in you pulling over at Walmart and purchasing a $35 player for your child since your $2000 system can’t handle it.
I know this sounds only like complaints, but if you’re about to purchase one it’s nice to know the areas you might have issues with. Most of my annoyances are in the NAV system so if your willing to drop the cool factor, buy the Rand McNally and put the $2k somewhere else. My daily driver car is a GS400 from Lexus and while I believe it’s a great car its far from perfect and has annoyances just like many other cars. Overall this is a great rig and after test-driving many SUV’s, we thought this won hands down
Any major changes coming in 2004?
Does anyone know if GM deleted the cabin air filters for 2003 or have they moved. If they are deleted it is clear GM is not interested in offering better products, just cheaper ones.
http://www.usatoday.com/money/autos/2003-07-30-premiumgas_x.htm
A separate issue that was not touched on by the article was detergent content. Higher octane gasoline typically has a higher detergent content. Higher detergent content results in a greater ability to avoid carbon build-up on the intake valves. Carbon build-up on the intake valves if not cleaned periodically, will result in drivability problems such as stalling.
While I am not advocating running premium in the Vortec engine, I do think that periodic usage of premium can be beneficial for intake valve deposit cleaning purposes. As to the precise ratio between tanks of 87 octane to tanks of 91 octane, I do not presume to have that answer.
What I have ended up doing is a compromise - I run the mid (89) grade gasoline in my Denali. In my 2001 Denali, over two years and 24,000 miles, I had no problems with stalling. I plan on following the same formula with my 2003 Denali (don't change what has worked in the past...).
FYI: I left my Business trip log on the DIC running for about the last 20k miles: AMPG = 15.4 @ AMPH = 36.3. This pretty much is on par with what I get in my daily commute which is about 70% hwy/30% street.
Doesn anyone here know about turning assist on all four wheels ? That may not be what it is called. I had a Suburban rental that was incredible - the turning radias was just like a car !!!! I called the dealer & they didn't know much about it ???? Is it available for 03?
Any thoughts on XL versus DXL?
Another question about ONSTAR changing it's communication format & will only work for a few more years. I can't remember where I heard or read that - any one know more info?
Thanks!
I received something from On-Star or maybe it was in their magazine (which I can't find right now as per Murphy's law) discussing that the support for analog communications systems was likely not going to be supported after 2006 I think it was. Digital overwhelmingly dominates the market and On-Star was developed as an analog system. They said they are working on some solutions, but...
What speed does your Denali idle at? I noticed that my Denali is idling a little under 500 rpm (tach readout) and sometimes appears to have a slight hesitation/rough idle. Earlier postings mention some throttle body issues; do the gaskets develop vacuum leaks on the throttle body? Is there a DIY fix for this? I was going to wait for it to get worse so that it will repeat itself at a dealership. This is on a Denali with 43k miles.
"Topic: Federal Ruling
Summary: Recently, the U.S. Federal Communications Commission (FCC) ruled that wireless carriers will no longer be required to support the analog wireless network after February 16, 2008. After that, if the carriers for OnStar elect to provide only digital service, beginning Feb. 16, 2008, OnStar service will only be available through dual-mode (analog/digital) hardware. As of June 2003, all OnStar systems utilize analog-only hardware. From the beginning, OnStar has relied on a nationwide analog wireless network to provide communication to and from OnStar-equipped vehicles."
all DIC calculated figures:
trip summary:
15.3 mpg
2383 miles
51.7 amph
155.4 gallons used
mostly open highway (but some construction, mountain and canyon, etc., all with A/C, 85%+ highway driving)
best leg:
17 mpg
57.1 amph
347.5 miles
included mountain passes (Denver to Utah)
fastest leg:
16.5 mpg
72.5 amph
256.9 miles
ethanol summer blend (MN fuel, not E87)
14.6 mpg
68.9 amph
288 miles
http://www.torquemaster.com/
http://www.magnecor.com
No rough idle for me.
What about rough Idle. I had a problem that appeared to be cured with fuel injector cleaner but I still feel a slight surging or maybe a jumpy throttle at low speeds. Is there a TSB relating to this problem? Seems like several members have experienced similar surging idle problems.
Took it into the dealer and they took care of the issue. On my receipt...
"Run Diag. Throttle Actuator Signal Dropping In & Out. Replace Throttle Actuator."
I purchased my 01 YDXL with 43000 miles, so I have no warranty. How can you tell if a TSB will be covered by GM on an out of warranty vehicle. Or, is it simply the owner's problem once the warranty runs out.
Anyone care to respond the the cold start knocking issue??????
This sound is definitely NOT like the classic piston slap which is one or two per rev deep raping sound that lasts for 15 or more seconds. I've had that on previous 5.3L and 5.7L vehicles.
The dealer noted my problem and has advised we monitor it.
I'm puzzled !!
Barry
1. Front end gear noise
2. All interior lights flicker at idle
3. Tranny hesitates when shifting from 1st to 2nd gear
4. When leaving a red light, the tranny will sometimes fall out of gear, free rev the engine, and then bang in to gear (this is horrible for a AWD vehicle)
However, the main problem I am claiming is the gear noise from the front axel because I can duplicate the noise every time. It drives me crazy!!!! GM kept my vehicle in the shop over 50 days and spent over $8,000 of GM’s money to fix. Nevertheless, they have yet to fix the problem. Finally, the Area Svc Mgr (I am in Atlanta, GA.) drove my truck and said it is supposed to make that noise. YEAH RIGHT! It is funny that the svc dept hears the noise and attempts to fix but he claims that the noise is normal. I disagreed and began the BBB Auto Line process. I am set to arbitrate on the 26th of August. Do you have any suggestions? Also, I took my truck to another dealership and acted like I knew nothing about cars and asked them to test drive. They drove it and put in writing that there is something wrong with the front end. Was this a good move to prove to the arbitrator?
Any feedback from anyone would be helpful!!!
Thanks in advance for everyone help!
In doing so, they made a tear on one of the leather seats and failed to re-attach the center storage bin lamp. Service dept. couldn't "recreate the problem" regarding that lamp. I ended up disassembling the bin/console myself to find the lamp assembly tucked away where it didn't belong.
Let me know how your repair goes.
I had the trans on my '02 Denali replaced when it was only a week old. It still doesn't feel right to me.
Thanks!
1. Tranny hesitates when shifting form 1st to 2nd:
a. Happens when cold and at normal operating temps
b. Only happens under light throttle (never under hard acceleration)
c. Feels as if it wants to shift in to 2nd by learching back and forth but doesn’t
d. It stops once in 2nd gear
e. Summary, GM claimed that the clutches were slipping in the rear end. They drained the rear end and filled with new oil and additive. This did not solve the problem.
2. Tranny falls out of gear and slams back in gear:
a. Does not happen all the time.
b. Only happens after fully warm and have been driven for a while.
c. It always happens at red lights. The light turns green; I hit the gas (with it in gear of course) the engine free reves and suddenly bangs in to gear. I always look in my rear view to see if I left any tranny parts on the road.
d. Please note: If it ever happens as I attempt to merge in front of traffic I will either blow up the engine or tranny due to hard acceleration.
e. Summary, GM cannot duplicate the problem so they have not fixed. Nevertheless, they claim that there is a TSB out there.
I love the truck; I hate the problems. Why did you have the tranny changed in your truck? Please explain. Also, do you have problems with front gear noise of pulsing lights?
I could go on all day but will not bore everyone!!!
I have 18K miles on the truck now and on rare occasions it does hesitate during the 1-2 shift.
I feel the same way - I love the truck but hate the problems (I still have others).
Good luck to you!
Annapolis to Wheeling, WV. 16.1mpg, speeds 65-70.
Wheeling to St Louis, 17.0mpg speeds 75. (lots more level ground).
All from DIC on '03 YDXL, 3 adults, 2 little ones, rear full to roof.
Barry
TSB: 03-04-17-005
· Replace the front propeller shaft with an internally tuned dampened shaft*
If so, please respond back and let me know what the results were. This seems to be a “Cover Up” solution. Why would the “front end” gears whine while the “rear end” gears are quite? I can’t seem to figure it out and neither can GM.
As always, thank you for the feedback.