Last post on Jan 04, 2013 at 10:23 AM
You are in the Pontiac G8
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Pontiac G8, Car Warranties, Sedan
#57 of 66 Re: Mileage Range Gauge Erratic, Inaccurate on 2009 Pontiac G8 [lara6]
Mar 27, 2010 (2:42 pm)
You do not specify exactly what you mean by ‘false’.
My experience [ 2009 G8 GT ] has been that:
First – the range is rather conservative – to reduce the likelihood of the driver running out of gas, I presume
Second – the ‘recent’ in the manual excerpt below actually means that it is biased rather heavily to reflect the VERY recent MPG. By this I mean that it appears to look at [ perhaps ] the most recent 25 miles of driving – but disproportionately reflects the MPG in recent 5 or 10 miles [ or 5 \ 10 minutes ] of driving.
This means that [ for example ] if you have been driving through city streets, with significant time idling at stop lights & accelerating \ slowing in the lower gears, resulting in dismal MPG – the range will reflect an expectation that you will continue to drive in that manner – until you fill the tank.
But if you then start driving on a highway at a steady 60 MPH, the range calculation will begin to take that [ higher, recent ] MPG driving into account – and though you have used more fuel, the ‘range’ display will actually rise. Sometimes rather dramatically.
This has happened to me on many occasions – as my commute home from work is precisely this scenario.
And between my house & where I typically do fill my tank, if I drive directly there as soon as I start my car in the morning – on my way to work, the range display will drop significantly in that 2 miles. Reflecting the relatively poor MPG achieved while the engine is receiving a rich fuel mixture – because it is cold.
From the manual:
The fuel range estimate is based on an
average of the vehicle’s fuel
economy over recent driving history
and the amount of fuel remaining
in the fuel tank.
Mar 27, 2010 (5:47 pm)
I just noticed that you posted on the page I linked to above.
I presume that means you read all the previous posts -
Please state your expectations of a range display?
And how you would expect he calculation to work?
#60 of 66 Re: Mileage Range Gauge Erratic, Inaccurate on 2009 Pontiac G8 [lara6]
Mar 29, 2010 (7:40 pm)
rayainsw #57 reflects my experience. I just ignore that readout. It's like instantaneous MPG, means nothing in the long run.
#61 of 66 Suspension issue(s)
Aug 03, 2010 (1:15 pm)
Have a 2009 Pontiac G8, I have had the vehicle in 4-times for the same issue. I keep getting a clucking noise from the front end, the vehicle was serviced 08/09 whereas both left front lower control arms were replaced. Two weeks later 08/09, again both left side lower control were replaced ( dealership cited excessive play ). 07/10 same complaint, dealership replaced all four control arms ( dealership again cited excessive play ). Now here it is two weeks later 08/10 and the vehicle is back in for the same issues.
I've seen the previous post for clunking/clicking/knocking on the front end and info on recall campaign 09203A. My question is -- is this something that can/should be fixed or it going to an on-going issue. Any help would be greatly appreciated.
#62 of 66 Re: Suspension issue(s) [xchips]
Aug 04, 2010 (6:22 am)
Has the dealership fixed the concern yet? If not, have they contacted technical assistance to help them solve the concern? Thank you,
Mariah GM Customer Service
#63 of 66 new p/n Re: Suspension issue(s) [xchips]
Aug 25, 2010 (2:54 am)
2008-2009 G8 – Knock noise from front suspension
over small bumps
Use new P/N 92249538 to
obtain all four lower control
Do not obtain all four control arms
individually instead of using the new
#64 of 66 Re: Rumble strips [jbieber]
Jan 04, 2013 (9:20 am)
Go get an HP tuner. You can turn off the AFM with it. Several others may be able to do this as well. A tuner shop can also turn it off. While this "rumbling" people complain about does occur, the fact is other vehicles use this same engine and the same programming with no noticable affects. Why? something else in the design of the G8 is making it noticable, otherwise you would see similar issues and complaints from vehicles with this engine - check out the Holden sights in Australia - no such complaints.... Been trying to figure out what's different, but no luck so far.
#65 of 66 Re: Suspension issue(s) [gmcustsvc]
Jan 04, 2013 (9:31 am)
I have found a similar issue, but not the same with my front suspension. The problem is, when you turn right it continues to pull right for an extended period of time. About a mile or 2 excelerating from 0 to 40 or 60mph. Same happens if you turn left - which it then pulls to the left for a while. I have had the dealer look at this, confirm the issue, but noone can figure out why. I have been told this was due to the Caster Alignment and the design for the G8. I have been told this is a design of the car. There is no other car I have driven before with these characterstics including - 2006 Corvette, 2000 Ford Mustand, 2011 Lotus or any others. They have called "GM Technical Support" and are still waiting for an answer.... Any ideas on who I go to next?
#66 of 66 Re: Suspension issue(s) [lorenm1]
Jan 04, 2013 (10:23 am)
We can certainly appreciate how tedious it can be to wait for answers! If you would like for us to check into this further, please email us at socialmediagm.com (include your name and contact information, a summary of your situation, and the last 8 digits of the vehicle's VIN).
Sarah, GM Customer Service