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G8 Problems

41 messages,  Last post on Nov 25, 2009 at 2:42 PM

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What is this discussion about? Pontiac G8, Car Warranties, Sedan

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#34 of 41 Re: Low front air dam [whoosierdaddy] by gearhed Oct 29, 2009 (5:00 am)
Replying to: whoosierdaddy (Jul 11, 2009 12:11 pm) I stop the car when the tops of the outside mirrors line up with an imaginary line drawn across the concrete bar. This stops the point of the front air dam about two feet away. Better safe than sorry. Replies to this message: whoosierdaddy (Nov 01, 2009 7:06 pm)
#35 of 41 Re: Low front air dam [gearhed] by whoosierdaddy Nov 01, 2009 (7:06 pm)
Replying to: gearhed (Oct 29, 2009 5:00 am) Thanks, I'll try that. Have been VERY careful since.
#36 of 41 Rumble strips by jbieber Nov 14, 2009 (8:14 pm)
2 months ago I bought a GM Certfied 2009 G8 GT with about 19,000 miles on it. Love the car but have one issue which the dealer is claiming is normal. When driving at slow speeds (20-30mph) or in traffic, when I just give it a slight amount of gas pedal, I get a constant vibration through the gas pedal that feels like a mild rumble strip on a highway. I've seen many other transmission and vibration problems on this and other G8 forums, but haven't seen this one. Any suggestions would be appreciated, before I go to war with the dealer. Replies to this message: rayainsw (Nov 24, 2009 3:40 am) jbieber (Nov 25, 2009 11:12 am)
#37 of 41 Rumble strips is your AFM DoD by gearhed Nov 22, 2009 (7:02 pm)
You DO know your G8 GT cuts back to four (4) cylinders at LIGHT gas pedal or drifting downhill. This saves gas. AFM (Active Fuel management) or DoD (Displacement on Demand) lets this powerful engine get six cylinder gas mileage if driven lightly. Don't be a numbskull and blame the dealer. It's SUPPOSED to do this and you will get vibration in four cylinder mode.
#38 of 41 Re: Rumble strips [jbieber] by rayainsw Nov 24, 2009 (3:40 am)
Replying to: jbieber (Nov 14, 2009 8:14 pm) “Don't be a numbskull and blame the dealer.”   I find the name-calling offensive.   As a G8 GT driver, I can make these [ potentially useful ] comments: Though cylinder de-activation can occur at 20-30 MPH, I find that the effect of AFM \ DoD is typically most noticeable at steady speeds between 55 and 65. You can monitor the de-activation by driving at the same speeds \ throttle openings in Engineering Mode. And you can verify [ or eliminate ] AFM as a possibility, by driving under the same conditions in Sport \ Manual – as AFM does NOT activate in that mode. Good luck. - Ray 2009 14,900+ miles . . . Replies to this message: jbieber (Nov 25, 2009 11:12 am)
#39 of 41 air condition problems by mjc5865 Nov 24, 2009 (6:58 pm)
i bought a new 2009 pontiac gt in june of this year.. i love the car it is very fast and fun to drive.. but i am having issues with my ac compressor i am currently having the third one installed in the car along with the second serpentine belt... is anyone out there having the same problems with there g8 gt??? thank god it is under warranty
#40 of 41 Re: Rumble strips [rayainsw] by jbieber Nov 25, 2009 (11:12 am)
Replying to: rayainsw (Nov 24, 2009 3:40 am) Thank you very much Ray. I found the name calling offensive as well , but I did appreciate the info. I did find it strange that the dealer didn't think of the AFM possibly being the culprit. My problem does go away in manual mode, but not in sport mode. When I ran this by the dealer, he did say that the AFM is most likely the issue and he had no ability to deactivate it. He did say that other GM models in the past have had transmission issues and eventually GM comes out with a programming update to address the problem. Despite Pontiac folding, he felt confident the issue would get addressed, as this engine and transmission are used in some other GM models. Until that happens, I'll be using manual mode alot. Thanks again and happy Thanksgiving. John
#41 of 41 G8 GT good vibrations by gearhed Nov 25, 2009 (2:42 pm)
By Numbskull, I take offense that someone would blame the dealer for something that IS supposed to happen.   "Any suggestions would be appreciated, before I go to war with the dealer."   The dealers have enough problems without owners going in and starting a "war with the dealer." over vibration inherent in the design. In order to make a V8 get the gas mileage of a six during light throttle, the ECM cuts fuel to every other cylinder. The dead rotating mass is GOING to vibrate more than if all eight cylinders are firing consecutively.   My GT does it and the other two I test drove do it too. Why complain when you are getting the power of the V8 with great mileage for an engine this powerful?   Don't complain that the dog sings out of key, but be thankful that he can sing at all.

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