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GMC Yukon / Yukon Denali

3260 messages,  Last post on Apr 28, 2009 at 7:02 AM

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What is this discussion about? GMC Yukon Denali, GMC Yukon, SUV

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#2995 of 3260 Re: '02 vs '05 Denali [acefield] by circutmann Oct 04, 2005 (9:14 am)
Replying to: acefield (Oct 03, 2005 4:38 pm) Check the rear end (axle) gear ratio of the 05 & that of the 01. My guess is that you probably had 3.73 gears in the 01, and have something much lower numerically, like 3.42 or 3.21 in the 05. The lower numeric ratio should give you better fuel economy on the road, but has less accelleration & towing capacity. If the gear ratios are the same, then I would definately suspect some other problem, as I believe the 05, 5.3L engine is rated at more HP than that of the 01.   I currently have an 01 YXL w/ the 5.3L & 3.73 gears & have been satisfied with the performance. My 01 was rated at 14/16 MPG, & I bet your 05 is rated much higher. I even tow a 34' travel trailer, weighing in excess of 8000 lbs w/ no problems. I know I am pushing the limit, but I had the 01 YXL before we upgraded to the bigger trailer. Next time I'll probably go with a 3/4 ton & 4.11 gears for more towing capacity. Enjoy your new truck, & hopefully better fuel economy.   Good Luck, Dave Replies to this message: acefield (Oct 06, 2005 3:09 pm) beach15 (Oct 07, 2005 12:17 pm) arrie (Oct 08, 2005 8:05 am)
#2996 of 3260 Re: Denali Nav System, Lights [cornellpinoy] by tdoh Oct 04, 2005 (11:24 am)
Replying to: cornellpinoy (Oct 03, 2005 4:00 pm) I assume you mean that the SS fog bulbs are hard to come by, as opposed to asking if such bulbs exist...in which case, you just gotta search a bit harder. Replies to this message: cornellpinoy (Oct 04, 2005 5:13 pm)
#2997 of 3260 Re: Denali Nav System, Lights [tdoh] by cornellpinoy Oct 04, 2005 (5:13 pm)
Replying to: tdoh (Oct 04, 2005 11:24 am) That is what I meant - haven't seen SS fog bulbs at any of the auto parts stores I shop at. Not really a big issue for me since I rarely use the fog lights.
#2998 of 3260 '07 roll out by steve_ HOST Oct 05, 2005 (10:27 am)
GMC Pulls Wraps Off Redesigned 2007 Yukon (Inside Line)   Steve, Host
#2999 of 3260 NAV system software ? by gipper2nd Oct 06, 2005 (10:23 am)
I own an '03 Denali with the Nav system. I would like to update the map C.D., but almost choked when the dealer said the cost was $375.00 for a new C.D. Anyone know where to get one other than the dealer? P.S. the one that came with the car was dated 2002. Replies to this message: tdoh (Oct 12, 2005 9:03 am)
#3000 of 3260 Re: '02 vs '05 Denali [circutmann] by acefield Oct 06, 2005 (3:09 pm)
Replying to: circutmann (Oct 04, 2005 9:14 am) Thanks a-lot. You are apparently correct. I don't recall the axle ratio in my "01, and I no longer have the papers. However, my "05 has a 3.42 gear ratio has you suggested, which is quite low. I bet this is a lot of the problem, but I still think something else is different perhaps in the timing or timing advance, because I still have a very unresponsive accelerator and it sputters and coughs at low speeds such as 1st and 2nd gear. Still awaiting the evaluation from the dealer. I greatly appreciate your input. Happy trailering!   Charles Replies to this message: beach15 (Oct 07, 2005 12:17 pm) arrie (Oct 08, 2005 8:05 am)
#3001 of 3260 '00 Denali Turn Signal Problem??? by blackstang Oct 06, 2005 (7:30 pm)
Turn signal combination relay keeps clicking even after the turn signal is off. I changed the relay and it still does it, what would you guys suggest? Any help is much appreciated 2000 GMC Yukon Denali 4x4 5.7 Vortec
#3002 of 3260 Re: '02 vs '05 Denali [acefield] by beach15 Oct 07, 2005 (12:17 pm)
Replying to: acefield (Oct 06, 2005 3:09 pm) Another difference between your '01 and '05 would be the accelerator itself--it was the typical cable-controlled system through '05, and then switched to a computerized throttle for '03+, which basically means you're now stepping on a computer sensor of such that attempts to open the throttle to the level it thinks you want.   We went from an '02 Avalanche 1500 2wd Z66 with the 5.3L and the 3:73 axle to an '04 Suburban 1500 2wd also with the 3:73 axle, and I've noticed very little difference between the two in feel--in all honesty, the Suburban has the same level of grunt, more accelerates more smoothly because of the electronic throttle. With the older style on the Avalanche, it would often buck and roar like a bronco if you didn't keep your foot 100% steady--the Suburban's pedal compensates for that and smooths things out a bit.   Another change in '05-06 models is electric fans, but that actually should make it feel MORE powerful because of less draw on the engine than the old mechanical fans.   Then again, if your new '05 "sputters and coughs" something else might definately be wrong.
#3003 of 3260 Re: "Stolen" Keyless Entry Remote - Solution? Help! [berob] by arrie Oct 08, 2005 (7:16 am)
Replying to: berob (Sep 01, 2005 10:39 am) I thik the remotes CAN be re-programmed. You buy new remotes and at the GMC or Chevrolet dealership they teach the car what remote frequencies to work with.   I assume they can disable the original frequency too.   I think you were misinformed as it would be stupid if GM would build cars where the remote frequencies could not be disabled as you must not be the only person who had keys lost/stolen, but of course, I'm not 100% sure...   Arrie
#3004 of 3260 Re: '02 vs '05 Denali [acefield] by arrie Oct 08, 2005 (8:05 am)
Replying to: acefield (Oct 06, 2005 3:09 pm) Charles,   I have a '04 Tahoe with the 5.3 L Vortec Z-engine. I have posted a lot of it in Tahoe forum and if you are interested go there and read.   In a nutshell, I think my main problem was LOOSE INTAKE MANIFOLD BOLTS. It is hard to believe but all 10 bolts that hold the plastic intake manifold down were loose.   Before I went to inspect these bolts I checked all sensors and replaced half of them while trouble shooting the issue. And I had to do this all by myself during warranty period. My Chevy dealer would not even believe I had a problem.   My Tahoe at first was good and powerful but after about 1500 miles it started acting up. Gas mileage went very low, only about 14 - 15 MPG highway. What also was bothersome was that the engine was so weak. When GM advertise it to have almost 300 hp you would think it to be a little bit faster from standstill.   One interesting symptom was that when I started from a complete stop and tried to make fast acceleration my Tahoe would first hesitate and when speed went high enough the power suddenly kicked in. It felt like power was in the engine but it would not come out before certain engine speed was reached.   This all lead me think about possible intake vacuum leak, which I also could hear under the hood, just didn't know it really was an intake leak sound.   Intake vacuum controls engine timing and I thought that perhaps timing is off due to leak and engine can not give out all power because of that. Then when accelerating and vacuum builds in engine power suddenly kicks in.   To verify this I made an intake vacuum delay apparatus to see if it really is an issue with vacuum level. I had bought another MAP sensor earlier so it was easy for me to do. I bought dia. 1/8", 3 ft long vacuum hose that I connected to the new MAP sensor. I T-ed off of the vacuum line to the fuel pressure regulator and of course connected the map sensor harness to the new MAP sensor. THIS MADE A BIG IMPROVEMENT IN POWER OUTPUT.   After my little experiment I went to check intake manifold gasket. I found a GM Techlink page in the net where they explain about the intake gasket problem and how they need to use the green color gasket in the L59 engine instead of the orange gasket. Mine was green but all of the bolts were loose.   There was a lot of dirt build-up under the manifold also, which I think is because the leak in gasket pulled dirt in there. That much dirt should not be present since there are good foam seals at each end of manifold to seal the cavity between intake manifold and engine valley cover.   From the gaskets and sealing surfaces I could clearly see how the gasket had not even touched all the surface around intake ports. This problem comes from the fact that the plastic intake manifold is slightly off shape and if bolts are not tightened correctly the surfaces don't compress on the gasket correctly.   I bought a set of new gaskets (about $93 + tax) and installed using bolt tightening instructions in Haynes repair manual and MY TAHOE JUST GOT RE-BORN.   The power from the engine now comes almost immediately when I step on gas pedal. That power kick now happens when it is supposed to happen. I have not even tried my vacuum delay apparatus with it since the gasket change.   I think my intake manifold gaskets still have a small leak problem because the engine still runs rough idle at times.   Rough idle is also a clear sign of gasket leak, which you might also be experiencing.   Go read my posts in Tahoe forum (and Suburban). There is a lot of writing I did but I think my problem really was the intake manifold gasket leak, which I covered here.   Here is the link to GM Techlink that explains about the gasket problem.   http://www.gmtechlink.com/images/issues/may05/TLmay05e.html   Arrie

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