Poor gas mileage and shifting - Page 2 - Saturn Outlook Online Community
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post #11 of 46 (permalink) Old 07-08-2008, 04:58 PM Thread Starter
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Re: Poor gas mileage and shifting

No, haven't heard of any updates to increase MPG--in fact, I was at the dealer last week and they said there is an update that improves shift performance but reports to lower MPG by 3-4. I believe some other threads in this forum relate the same story.

Big sigh....I love our Outlook but just despise the MPG and shifting issues. While it is comfortable to drive, the performance of the tranny and the fuel economy leaves much to be desired. I hope they correct this so when I turn this lease over in a few years a better version is on the scene...otherwise I'll look at another model.

Take care...
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post #12 of 46 (permalink) Old 07-08-2008, 05:11 PM
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Re: Poor gas mileage and shifting

Quote:
Originally Posted by Dai_Shan
Do you use cruise control at all? Percent of the time?
Yes, about 50% of the ride. Seems the computer finds the same soft mushy spots while trying to accelerate that I do.

Dave<br />2008 Outlook XR
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post #13 of 46 (permalink) Old 07-15-2008, 09:14 AM
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Re: Poor gas mileage and shifting

I have a 2007 Outlook also. The transmission is constantly shifting up and down. It shifts at the slightest incline and sometimes will shift back and forth three times before you get to the top of a hill. I too have taken it back to the dealer twice. They first said it was normal. The second time they installed the latest software on the computer. Nothing has changed. I feel that I am stuck with a lemon which cannot be fixed. I think that in trying to get fuel economy, they made a transmission with too many gears (6) and it continually shifts back and forth. Outside of a total redesign, there is probably nothing that can be done for it. I wish I had kept my Highlander. Also, the cruise control is absolutely worthless because it will shift at the first hint of a slight incline. It will usually shift from 6 to 4 and immediately up to 5. Then, maybe back to 6 and back to 4 and 5 again. It will drive you nuts. I hate it.
post #14 of 46 (permalink) Old 07-16-2008, 12:22 PM Thread Starter
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Re: Poor gas mileage and shifting

Quote:
Originally Posted by Disgruntled
I have a 2007 Outlook also. The transmission is constantly shifting up and down. It shifts at the slightest incline and sometimes will shift back and forth three times before you get to the top of a hill. I too have taken it back to the dealer twice. They first said it was normal. The second time they installed the latest software on the computer. Nothing has changed. I feel that I am stuck with a lemon which cannot be fixed. I think that in trying to get fuel economy, they made a transmission with too many gears (6) and it continually shifts back and forth. Outside of a total redesign, there is probably nothing that can be done for it. I wish I had kept my Highlander. Also, the cruise control is absolutely worthless because it will shift at the first hint of a slight incline. It will usually shift from 6 to 4 and immediately up to 5. Then, maybe back to 6 and back to 4 and 5 again. It will drive you nuts. I hate it.
Yout hit it right on the head.....I had mine in for the state inspection and asked them to check it out...you guessed it "All systems operating normal". The comfort and styling are great...the gas mileage and shifting are horrible. If I could get my 04' Grand Caravan back that I traded in, I would in a heartbeat. I can't wait until my lease expires so I can actually get a vehicle I can afford to drive and more importantly, is enjoyable to drive from a performance standpoint.
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post #15 of 46 (permalink) Old 07-17-2008, 05:43 AM
 
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Re: Poor gas mileage and shifting

Khansen30.... please please tell us how you're getting 25 - 30 miles per gallon on the highway. The best I've ever hand calculated was 24 on the highway. Never hear of a lamda getting 30 mpg.
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post #16 of 46 (permalink) Old 07-17-2008, 10:13 AM
 
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Re: Poor gas mileage and shifting

I havn't had mine for that long, and havn't had it on any significant hwy trips.

But just cruising on the Hwy and then resetting the Avg MPG I can definitely see how much it can fluctuate. With cruise control on and a flat road, I see it sit pretty steady up in the 30-32 mpg range (with AC off and no headwind). Now this isn't EPA Hwy testing, but for my use....it is "HWY" use. Like for long trips etc....this is what i should get (assuming AC off and no bad headwind).

Going on my first hour+ drive on the freeway this friday...(fully loaded car) so we'll see how she performs.

This is assuming the MPG calculation/sensors are accurate (which i hear most are right on these days)

On the otherhand with mixed city driving, onoff ramps etc, hwy changes .... with cruise on some of the time, i get around 21 so far it seems like (sometimes lower...sometimes higher depending if i hit a few lights etc)
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post #17 of 46 (permalink) Old 07-19-2008, 07:14 PM
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Re: Poor gas mileage and shifting

Quote:
Originally Posted by Disgruntled
I have a 2007 Outlook also. The transmission is constantly shifting up and down. It shifts at the slightest incline and sometimes will shift back and forth three times before you get to the top of a hill. I too have taken it back to the dealer twice. They first said it was normal. The second time they installed the latest software on the computer. Nothing has changed. I feel that I am stuck with a lemon which cannot be fixed. I think that in trying to get fuel economy, they made a transmission with too many gears (6) and it continually shifts back and forth. Outside of a total redesign, there is probably nothing that can be done for it. I wish I had kept my Highlander. Also, the cruise control is absolutely worthless because it will shift at the first hint of a slight incline. It will usually shift from 6 to 4 and immediately up to 5. Then, maybe back to 6 and back to 4 and 5 again. It will drive you nuts. I hate it.
Those of you dissapointed with the transmission performance, especially if you own an '07, need to get the May 8th transmission flash upgrade. Many Acadia and Enclave owners who weren't happy with tranny performance have said it is a marked improvement. One of the GM powertrain engineers worked with many forum members to come up with the re-calibrated algorithms. The details are posted below.

ALSO, when in cruise the tranny DOES NOT downshift from 6th to 4th and immediately back to 5th. What it actually does is downshift to 5th WITHOUT torque converter lockup. The next immediate upshift you feel is the torque converter locking back in. All transmissions have to kick out the torque converter to downshift. The May 8th upgrade also includes an April upgrade to help the tranny "hold" higher gear when on an incline without upshifting back to 6th until the hill/grade has leveled back out. Good Luck!


#08-07-30-022: Hesitation or Flat Spot Between 56-80 km/h (35-50 mph) (Reprogram Transmission Control Module) - (May 8, 200

Subject: Hesitation or Flat Spot Between 56-80 km/h (35-50 mph) (Reprogram Transmission Control Module)
Models: 2008 Buick Enclave
2007-2008 GMC Acadia
2007-2008 Saturn OUTLOOK
with FWD or AWD
--------------------------------------------------------------------------------
Condition
Some customers may comment on a flat spot or hesitation between 56-80 km/h (35-50 mph) speed range.

Cause
The existing transmission calibration is programmed to maximize fuel economy and requires a greater throttle input than some customers would prefer to provide acceleration in this speed range.

Correction
A new calibration is available. This new calibration increases the speed required to obtain upshifts and removes TCC apply from 2nd to 3rd gear, thereby reducing engine lugging and improving vehicle response to accelerator input.

Important: This calibration will have a negative impact on fuel economy of 0-1.2 L/100 km (0-2 mpg) combined driving.

To obtain this calibration, contact Techline (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French). Techline will reconfigure the vehicle to make this calibration the default calibration for this vehicle.

The table below shows the Shift Pattern Change at Light Throttle.

--
Current Calibration New Calibration
Shift MPH KPH MPH KPH
1-2 8 13 12 19
2-3 18 29 20 33
3-4 24 40 31 50
4-5 32 53 43 69
5-6 44 71 56 90

TCC Applied 2nd, 3rd, 4th, 5th, 6th 4th, 5th, 6th

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation Description Labor Time
K5364 Transmission Control Module Reprogram with SPS Use Published Labor Operation Time
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post #18 of 46 (permalink) Old 07-21-2008, 11:01 PM
 
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Re: Poor gas mileage and shifting

Do any of the 2008 Outlooks need the transmission re flash. I own a 08 XE that I find in some situations doe's not seem to find the right gear to be in.
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post #19 of 46 (permalink) Old 07-22-2008, 04:58 PM
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Re: Poor gas mileage and shifting

The above listed flash is "voluntary only" to respond to customers with complaints and has only been available since May 8th 2008. It is the "third iteration" of transmission flashes for this transmission. You may want to look into getting it.

ALSO, 2008 model year vehicles built prior to August 2007* have the same algorithm as the 2007's (first iteration). ALL lambdas built August 2007* or later are supposed to have the "second iteration" of transmission algorithms which corrected alot of the "sluggishness" or hesitancy to downshift when you hit the accelerator that plagued early 2008's and all 2007s.

*correction to my original post....I meant 2008 model year vehicles built after August 07 (not August 200
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post #20 of 46 (permalink) Old 07-23-2008, 01:03 PM
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Re: Poor gas mileage and shifting

ccaats is exactly right. None of the Lambdas have the newest (May 8th) transmission flash, since it's voluntary. However, a huge majority of users who have gotten it seem to be extremely happy with the performance of their transmissions afterwards. It comes with the caveat that it will possibly decrease mileage, but so far users haven't seen a measurable difference. If you're not happy with your transmission, I'd suggest you get the newest flash.
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