Last post on Oct 27, 2013 at 2:09 AM
You are in the Chevrolet Suburban & Tahoe
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Chevrolet Tahoe, SUV
#5451 of 6471 Re: 2003 Tahoe Cruise Control Problem [pbaker1]
Aug 17, 2005 (8:05 pm)
It might not be a cruise control problem at all. If you would try to run your Tahoe at constant speed on the same route by manual control you might end up seeing the same thing, i.e. you end up pressing the gas pedal so deep that the gear shifts down two steps to make it up the hill.
I have written a lot of info about my struggle with my '04 Tahoe with the Z-engine and after all the work I think I finally found the problem that probably was the main reason for all of my trouble. I changed spark plugs, plug wires 4 times, Oxygen sensor 4 times, MAP sensor and crank shaft position sensor. I did get a lot of help from changing the crank shaft position sensor and a little bit from one oxygen sensor and the new set of high performance spark plug wires for fuel economy.
One symptom I had with the truck was something that sounds much the same as you describe. The truck had to change down to 2nd gear to go up a hill that you would not think is steep enough for that. My Tahoe sometimes went over an overpass without any trouble without changing down at all but half the time over the same overpass with same speed it had to change down to 2nd gear. This did not make any sense to me but my dealer told me they can not find a problem.
Well, long story short: The biggest help for my Tahoe was to change the intake manifold gasket. I came across a GM techlink pages where they explain about the issue with orange color gaskets and say they need to be replaced with green color ones. I changed mine even though they were green color but clearly showed had not been tightened correctly. After gasket change everything changed to better, especially any need for gear changes at overpasses. No gear changes needed at normal overpasses any more and the whole truck responses to gas pedal like never before. It is just so much better than it was. You could not believe the difference.
GM might have a problem at their engine assembly plant where they do not tighten the intake manifold correctly leaveng it loose. This then developes a vacuum leak, which messes up with the engine ignition timing. Timing being off causes lack of power and all sort of other problems, like low gas mileage.
Have your intake manifold bolts torqued. If you have the same design engine as mine there are 10 bolts. The best thing would be first to see if your gasket works with correct tightening on bolts. It might work just fine.
What I would do is:
- first loosen all 10 bolts.
-tighten all bolts to 4 ftlb torque by instructions in Haynes manual. I bought Haynes manual for Chevrolet trucks up to year 2002. The engine is little different but for this part it seems to be the same. Tightgening of the bolts I think is important to do in the right sequence, like the manual says.
-after tightening the bolts to 4 ftlb tighten them to the final torque at 7.5 ftlb in the same order.
As I mentioned after doing this to my Tahoe it changed so much better it is hard to believe. I also used new gaskets, which cost $90 from the dealer.
#5452 of 6471 Re: Good question: Why do you drive a Tahoe/Yukon? [dardson1]
Aug 18, 2005 (6:42 am)
I agree. I get only slightly less city mpg on my heavier Avalanche and about the same highway.
#5453 of 6471 Re: Hybrid SUV vs Strong Hybrid [jlflemmons]
Aug 18, 2005 (7:04 am)
Nothing to apologize for. I think you're right and I appreciate your feedback. I don't need a Tahoe (or any SUV), and I don't like the idea that I will be burning a lot of gas for capability I don't need. But I have these long legs that have to go somewhere. The Tahoe with the bench seat is one of the few cars I'm comfortable in.
After thinking about this last night, Iím starting to believe that it doesnít make economic sense to wait for the hybrid Tahoe due out in the spring 2006 (if I decide to buy a Tahoe at all). This conclusion is based on some assumptions. The assumptions are:
1. The list price of the Tahoe I want is $39,000
2. I could buy it for $32,000.
3. Next year the list on this Tahoe as a hybrid will be $49,000. I could buy it at $3,000 over list, $52,000.
4. With non-hybrid Tahoe I buy today, I will average 18 mpg.
5. Iíll drive 15,000 miles a year.
6. The gas mileage on the hybrid Tahoe will be 30% better, or 24 mpg. (This is based on the projection from GM.)
7. Gas costs $5.00 per gallon.
With these assumptions (and not including the time value of money), it would take me over 19 years of $5 gas to recoup the extra (assumed) cost of the hybrid Tahoe.
Any comments or thoughts will be appreciated. Thanks.
#5454 of 6471 Re: Hybrid SUV vs Strong Hybrid [alston28]
Aug 18, 2005 (7:31 am)
Well done. I appreciate a person who understands math! So many folks don't think this through to see the true cost expended. My wife drives a Yukon daily, and some folks question her using such a high consumption vehicle. What they don't take into consideration is that 1) We also use it to pull a 7K lb travel trailer, 2) She is a girlscout leader and can carry herself and 7 others in seat belts, and 3) She averages less than 10K miles a year.
#5455 of 6471 Re: Hybrid SUV vs Strong Hybrid [alston28]
Aug 18, 2005 (8:14 am)
If new is not a requirement for you and leg room is, consider looking a used model. My 99 Tahoe (old body style) has significantly more leg room than the new body style. Find a lot that has both a 95-99 Tahoe/Yukon and a Tahoe/Yukon with the new body style so that you can sit in both minutes apart. You'll notice the difference. At 6'-5", it makes a big difference to me. One other major benefit of my 99 Tahoe is "it's paid for" and has been for some time now. YeeHaw!!! After living several years without car payments, I'll do whatever it takes to minimize financed vehicle purchases.
#5456 of 6471 Re: Hybrid SUV vs Strong Hybrid [davids1]
Aug 18, 2005 (8:24 am)
Thanks. New is not a requirement for me. I'll try to old style Tahoe.
I'm very comfortable in the new Tahoe. Until recently, I thought I wouldn't buy anything new, because I didn't want to take the first-year depreciation hit. My recent thinking has been that with the recent "employee pricing" the cost of new has been driven down, and the economics haven't caught up in the used market to drive down the cost of used. I had been think of something 1 or 2 years old. It seems that the cost of a 2004 or 2003 Tahoe is not sufficiently lower than today's cost of a 2005 to justify buying used. (I also have a brother-in-law in the business who may be willing to sell at his true cost.) Any further thoughts will be appreciated. Thanks.
#5457 of 6471 Re: Hybrid SUV vs Strong Hybrid [alston28]
Aug 18, 2005 (10:21 am)
If leg/head room is the issue, my VW Jetta TDI trumps the Tahoe in comfort. The leg/head room feels equally roomy (i'm 6'4) and the seats are far better than the GM bench. While the GM bench isn't terrible, it's more like a Kmart sofa than a good seat (IMHO, seat comfort is quite subjective obviously). I guess it really depends on whether you want a big vehicle that's comfy, or just something that's comfy. You could also try an Audi if you want folks to look at you or something. I find the german cars to fit me better than anything. Oh yeah the VW gets 45-47mpg with performance mods and my typical 80mph+ speeds. A bit better than even a hybrid Tahoe can dream of.
I really liked my Tahoe, but I do tow, haul six or more regularly, and do get into some un-plowed roads. I recently sacrificed (not really I have several other 4x4 trucks) the snow/towing capability and traded the Tahoe on a Honda Ody. Seat seems plenty comfy to me and it's a better people hauler. Gets better mpg too.
#5458 of 6471 Re: Hybrid SUV vs Strong Hybrid [sebring95]
Aug 18, 2005 (10:39 am)
Thanks for your imput, but you must be configured differently that I am. I'm 6/5" and all my height is in my legs. The issues for me are bucket seats and center consoles. I can hardly get in a Jetta. In an Audi A6, my knees are jammed against the steering wheel. In both, my leg rubs against the center console. I will definitely settle for something that's comfy. I don't need something that's big and comfy, but there's nothing on the market that's comfy for my build except things that are big - so far the cars I've found are the Tahoe with a bench seat and a Lincoln Town Car.
#5459 of 6471 Re: Hybrid SUV vs Strong Hybrid [alston28]
Aug 18, 2005 (11:31 am)
Yeah, I'm more top than bottom. I have a lot of trouble with head-room which is part of why I found the Jettas/Audis to be comfy. Plus the seats go back quite far.
Take a look at the minivans at least. We're getting between 19-24mpg in general driving with the Ody and performance is equal/better than the Tahoe. Drives better than a Town Car (IMHO, I hate mushy suspensions). Ody has a lot of features the Tahoe is lacking as well, which surprised me considering the price. We got a large touch-screen navigatino, backup camera, rear DVD, leather, six-disc changer, etc. all for less than I paid for my Tahoe back in 2002.
I may go to a Suburban in a couple years if they get the seating arranged better and have a flat-folding 3rd row. IMHO, the current Tahoes are a bit dated.
#5460 of 6471 Honda ODY vs Tahoe
Aug 18, 2005 (8:36 pm)
If you watch the ODY and Sienna threads (as I do), you will see these fairly heavy vehicles don't do all that much better than a Tahoe. If you factor out the 10% of ODY/Sienna drivers who claim great numbers and the other 10% that complain of low numbers. . . you land on 16/17 around town and 20/23 hwy for a green ODY/Sienna. While it's better than an un-PC Tahoe (15/19), it's about right. Moving 4300lb around with satisfying speed cost about 10% less than moving a 5000lb SUV with the same satisfying speed over the same ground. There is no free lunch. I'm old enough to remember when a big vehicle did well to do 9mpg around town and 13 driving on the road. I'm amazed how far we've come.