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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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#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
#3005 of 3260 Saving Passenger Settings with Numered Keys by rsuazo11 Oct 09, 2005 (5:23 am)
Hello everyone, I just got a new 2005 Denali XL. So far so good. My dealer said if you setup everything the way you want, then hold the UNLOCK button on the key simultaneously with the corresponding seat number on the door until it beeps - then it will "remember" the driver's settings based on which key starts the car. 2 questions: 1. Is that the correct procedure? I can get it to beep, but doesnt seem to save anything. Not sure it's doing anything different than if you just saved the seat setting by itself. 2. What all exactly is supposed to be saved? He thought the radio and satellite settings would be saved as well, but I can't seem to get those to save (I could be doing it wrong).   Thanks much to anyone who takes the time to respond. -RS Replies to this message: lobsenza (Oct 10, 2005 8:32 pm) tdoh (Oct 12, 2005 9:11 am)
#3006 of 3260 Re: Saving Passenger Settings with Numered Keys [rsuazo11] by lobsenza Oct 10, 2005 (8:32 pm)
Replying to: rsuazo11 (Oct 09, 2005 5:23 am) I think that feature may hgave deleted for the 2004 or 2005 model year. Replies to this message: tdoh (Oct 12, 2005 9:11 am)
#3008 of 3260 Re: NAV system software ? [gipper2nd] by tdoh Oct 12, 2005 (9:03 am)
Replying to: gipper2nd (Oct 06, 2005 10:23 am) Ebay...or if you're tentative about buying stuff off Ebay, then gmpartsdirect.com is another discount source (you'll need to know the part number--10390370 for version 3.0 nav disc; there is a 4.1 version that costs a bit more...and even moreso compared to 3.0 if bought off Ebay), if you're willing to swallow their excessively-high shipping charges.
#3009 of 3260 Re: Saving Passenger Settings with Numered Keys [lobsenza] by tdoh Oct 12, 2005 (9:11 am)
Replying to: lobsenza (Oct 10, 2005 8:32 pm) 2005, IIRC; as suspected (if indeed true--I'm only going off of what other '05 owners have noticed), memory recall can only be performed from the buttons on the door panel, and cannot be recalled via the numbered remotes...even though the remotes themselves are still numbered (GM must have had manufactured a ton of them; otherwise they would have been able to pinch a few more pennies by not having to stencil/label "1" and "2" on future manufactured remotes--LOL!!!).
#3010 of 3260 Re: Denali Nav System, Lights [cornellpinoy] by peterrollout Oct 12, 2005 (3:13 pm)
Replying to: cornellpinoy (Oct 03, 2005 4:00 pm) Hi. I found the Silverstar bulbs at the local Auto Zone. Just got the PIAA extreme white bulb. will find out how they do tonite on the way home. Replies to this message: cornellpinoy (Oct 16, 2005 6:54 pm)
#3011 of 3260 Lower grill for 05 denali by 05whitey Oct 16, 2005 (1:47 pm)
Hi guys , I am looking very hard for a matching lower grill for my 05 denali.I dont want to change main, I just want the lower piece to be exact.Any ideas?? Thank you Replies to this message: cornellpinoy (Oct 16, 2005 7:03 pm)
#3012 of 3260 Re: Denali Nav System, Lights [peterrollout] by cornellpinoy Oct 16, 2005 (6:54 pm)
Replying to: peterrollout (Oct 12, 2005 3:13 pm) How much were the PIAAs and what is your impression? I have an older set of PIAAs on another car. I don't think they are "extreme white" but I know they were pricey.
#3013 of 3260 Re: Lower grill for 05 denali [05whitey] by cornellpinoy Oct 16, 2005 (7:03 pm)
Replying to: 05whitey (Oct 16, 2005 1:47 pm) I've yet to see a grille for the opening on the front bumper that matches the factory Denali grille .   However, I have seen aftermarket grilles with a matching lower grille. Stop by a Barnes & Noble and look though some magazines that feature customized cars & SUVs.

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