- #3058 of 3125
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Re: AFM Reprogram to get better fuel economy [bill2007yukon]
by obyone
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Aug 14, 2008 (10:54 am)
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Replying to: bill2007yukon (Aug 14, 2008 10:02 am)
As with any type of ECU reprogramming, unless returned to stock when taken into the dealer for any type of warranty work, warranty may be void. I've seen it go either way depending basically on the service manager and what kind of mood he is in. That is if they find the programming.
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- #3059 of 3125
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Re: AFM Reprogram to get better fuel economy [bill2007yukon]
by 73shark
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Aug 14, 2008 (11:29 am)
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Replying to: bill2007yukon (Aug 14, 2008 10:02 am)
The ECU program puts it into the V4 mode when it determines that the engine can safely handle the load. It can stay in V4 for up to ten minutes and then has to go to V8 to allow temperatures in the engine to equalize. I've found that w/ 3.73 gears, mine stays in V4 more in town when in the tow/haul mode. Sometimes that results in higher mpg and sometimes it doesn't because it does cause rpm to be higher as it kicks out OD at lower speeds.
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- #3060 of 3125
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mileage for 07 Tahoe
by gmarugg
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Aug 16, 2008 (4:46 pm)
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I am getting about 16.5 MPG with mostly hwy miles. I have heard people talk about getting 20 MPG. What is normal?
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- #3061 of 3125
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Whats causing my 03 Yukon XL's battery to die????
by gpierce2
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Aug 16, 2008 (6:57 pm)
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I'm new here. Hi i'm Gregg. Last week I purchased an 03 Yukon XL. The truck would not start after a two hour trip. I jumped it and ran it next morning dead again. Sounds like a dead battery right? Well all this week it starts up no problem. tonight I went to the grocery store went in for ten minutes while the family stayed out with the radio on(truck was off) and the head lights on . When I went to start it the truck was dead. I needed a jump start. I came home just try to start it with no problems. Does this sound like an electrical problem???I thought when cranking batteries died. That was it.
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- #3062 of 3125
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'07 Tahoe leaking lots of oil...
by hardin_thicke
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Aug 16, 2008 (7:25 pm)
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I have a bad oil leak that appears to be coming from directly above the oil filter, (it's not the filter) on the block somewhere. The entire bottom side of the vehicle and rear glass is covered with an oil mist. Anyone else encounter this problem? I have 45K on it. I lost about a quart during a recent 700 mile trip.
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- #3063 of 3125
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Re: Whats causing my 03 Yukon XL's battery to die???? [gpierce2]
by tidester HOST
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Aug 16, 2008 (7:53 pm)
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Replying to: gpierce2 (Aug 16, 2008 6:57 pm)
Yes, it could be an electrical problem. The first thing I would check is the alternator. It sounds like your battery isn't being charged properly.
tidester, host
SUVs and Smart Shopper
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- #3064 of 3125
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Re: '07 Tahoe leaking lots of oil... [hardin_thicke]
by kiawah
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Aug 16, 2008 (8:28 pm)
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Replying to: hardin_thicke (Aug 16, 2008 7:25 pm)
You sure it's not from the oil filter? You could have a gasket from the old oil filter separate from the filter....and stay on the engine (I've had that happen with the original mfg filter on my 07 Sub). I always check to make sure the old gasket comes off with the filter, else you will have a leak with the new filter.
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- #3065 of 3125
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Re: Whats causing my 03 Yukon XL's battery to die???? [gpierce2]
by 73shark
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Aug 16, 2008 (9:04 pm)
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Replying to: gpierce2 (Aug 16, 2008 6:57 pm)
Places like Advance Auto will check your alternator and battery on the vehicle for free.
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- #3066 of 3125
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Re: Whats causing my 03 Yukon XL's battery to die???? [gpierce2]
by ahightower
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Aug 17, 2008 (7:56 am)
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Replying to: gpierce2 (Aug 16, 2008 6:57 pm)
Hi Gregg. I'm certainly no expert, but I suspect it may just be the battery. I had the battery die on me once at about 2 yrs/25K miles (just before heading off for vacation). I had been using a portable air compressor plugged into the cigarette lighter. Lights, radio, etc. worked fine, but the car would not start. Not even a click. OnStar button worked, so I called and they sent a guy out to jump it and it was fine for a full year. Then this past Mothers Day weekend (about 3 yrs/40K miles on the car), it died again. I was renting a little travel trailer (these things always happen just as we are headed out of town!), and again the radio, lights, etc. worked fine. I know because I had to test everything and make sure the trailer was properly connected before heading out. Then, again tried to start and nothing, not even a click. So, I got a jump and went directly to NTB. I shut the car off in their parking lot, and when I started it up again to pull it into the garage, it was perfect. No hesitation, nothing. But the guy at the garage there said 3 years was about the life expectancy of an OE battery and I decided I better just get a new one before heading out to camp in the middle of nowhere.
So, short story long, it seems to me that a dead/jumped battery can be recharged and behave well for a while and then start to stutter again after a while. If you have the original battery still, I'd go ahead and get a new one. Someone smarter than me can recommend a good brand, I ended up with whatever they happen to have at NTB because I wasn't in a position to go bargain shopping with a trailer attached and three kids in the car and a road trip set to begin the next morning.
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- #3067 of 3125
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'07 Transfer case fluid....
by hardin_thicke
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Aug 17, 2008 (9:52 am)
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Anybody know what color the transfer case fluid is? I have a lot of greenish fluid all over the bottom of my Tahoe.
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