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Old 02-10-2011, 07:32 PM   #1 (permalink)
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Take off hesitation?

Just curious if these cars normaly hesitate when taking off from a stop? I have a 2007 3.5LT. Im used to 3.8L in my grand prixs, and the impala seems to accelerate differently. it does not launch nearly as quickly and seems to lag in first gear. I figured maybe the impala is geared a little differently (or programmed different shift points) for older people (no offense, lol, but i think the grand prixs were sold as the sportier models) so as not to take off right from a start. maybe someone who owns a 7th gen with the 3.8 can chirp in with their input. i just think its weird that the 3.5 is supposed to have a few more HP but yet it seems slower to accelerate?

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Old 02-14-2011, 12:42 PM   #2 (permalink)
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Quote:
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Just curious if these cars normaly hesitate when taking off from a stop? I have a 2007 3.5LT. Im used to 3.8L in my grand prixs, and the impala seems to accelerate differently. it does not launch nearly as quickly and seems to lag in first gear. I figured maybe the impala is geared a little differently (or programmed different shift points) for older people (no offense, lol, but i think the grand prixs were sold as the sportier models) so as not to take off right from a start. maybe someone who owns a 7th gen with the 3.8 can chirp in with their input. i just think its weird that the 3.5 is supposed to have a few more HP but yet it seems slower to accelerate?
When you, "take off", be sure to have the flaps down and the wheels up! That could be a part of the problem!

All kidding aside, no vehicle should hesitate when accelerating. Something isn't right. Have a professional automotive technician diagnose it.

The Buick 3.8 V-6 was a fantastic engine. I personally think GM made a huge mistake in discontinuing that engine. It was probably too reliable and too easy to work on! The more dumb decisions like this that GM makes, that are contrary to what the consumer wants/needs, the more dissatisfied I am becoming with GM. My daily driver GM car has the oil pan gasket leaking and the part is only about $20. Easy, right? Wrong! To replace the oil pan gasket, the engine has to be removed! The dealer wants $1,200 to replace a $20 gasket! Recently the Throttle Position Sensor and Mass Aiflow Sensor went bad and when I opened the hood to replace them, I discovered that they have special Torx-bit Security Pin heads on the bolts, so with the average set of tools you can't replace them! It has become quite clear that GM doesn't want their customers working on their own vehicles and is trying to force us to go back to the dealer where we can get our wallets vacuumed empty!

I feel GM has lost sight of its past huge success, when they manufactured reliable, reasonably priced vehicles that with a little mechanical knowledge and a basic set of tools, the average consumer could repair. This is what made GM a great company making great cars. There's been a change at GM and it isn't for the better! It's no wonder they are having such huge problems staying in business. GM, wake up, before it's too late!

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Old 02-14-2011, 12:51 PM   #3 (permalink)
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This has been a common issue with the 8th gen impalas... it sounds like you are describing a throttle lag... that being, the time it takes from when you press the accelerator until you actually hear a response in the form of engine revolutions.

The throttle on these is electronic, so a push on the gas pedal doesnt equate to some mechanical pull of the throttle.

(Guys, please correct me if Im wrong on this) Try resetting the computer by unplugging the battery for at least 15 minutes. The throttle is supposed to learn your driving habits or something like that, and re-setting the computer can sometimes help with weird anomalies like this.

Overall, it shouldnt be awfully noticeable or detrimental. If it is, bring it to a dealership. you should be covered under you powertrain warranty, so you may be able to get them to diagnose it for free since it is engine related.

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Old 02-14-2011, 12:54 PM   #4 (permalink)
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Oh and BTW... when people post problems about their 7th or 8th gen impalas, it does them very little help to start complaining about the "new GM" and how they suck. Im not sure what your oil pan gasket problem has to do with the OPs problem. Especially when you dont even indicate what car you are talking about.

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Old 02-14-2011, 01:04 PM   #5 (permalink)
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Quote:
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Oh and BTW... when people post problems about their 7th or 8th gen impalas, it does them very little help to start complaining about the "new GM" and how they suck. Im not sure what your oil pan gasket problem has to do with the OPs problem. Especially when you dont even indicate what car you are talking about.
I posted a suggestion that would help. Then I continued, stating problems GM needs to rectify. There is a difference between complaining and stating issues that need to be corrected. That wasn't intended as help, so much as an observation.

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Old 02-14-2011, 01:08 PM   #6 (permalink)
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Yeah your advice was to have a professional look at the car. Super... 9.5 out of every 10 words you posted were "stating issues with GM" as opposed to helping the poster out with his problem. Maybe start a new thread? Call it "my rant about GM" im sure you would get a ton of responses since a lot of people agree with you, me being one of them

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Old 02-14-2011, 01:13 PM   #7 (permalink)
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Yeah your advice was to have a professional look at the car. Super... 9.5 out of every 10 words you posted were "stating issues with GM" as opposed to helping the poster out with his problem. Maybe start a new thread? Call it "my rant about GM" im sure you would get a ton of responses since a lot of people agree with you, me being one of them
The original poster made the observation that they were much more satisfied with the Buick 3.8 V-6 engine than what they have now. I merely commented to that. It was right on topic. I didn't rant. Thanks.

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Old 02-14-2011, 03:42 PM   #8 (permalink)
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The original poster made the observation that they were much more satisfied with the Buick 3.8 V-6 engine than what they have now. I merely commented to that. It was right on topic. I didn't rant. Thanks.
Good point. I stand corrected and apologize. I was PMS-ing and had ran out of man-pons. I owe you a beer

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Old 02-14-2011, 07:47 PM   #9 (permalink)
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Quote:
Originally Posted by AlfredoSmith View Post
This has been a common issue with the 8th gen impalas... it sounds like you are describing a throttle lag... that being, the time it takes from when you press the accelerator until you actually hear a response in the form of engine revolutions.

The throttle on these is electronic, so a push on the gas pedal doesnt equate to some mechanical pull of the throttle.

(Guys, please correct me if Im wrong on this) Try resetting the computer by unplugging the battery for at least 15 minutes. The throttle is supposed to learn your driving habits or something like that, and re-setting the computer can sometimes help with weird anomalies like this.

Overall, it shouldnt be awfully noticeable or detrimental. If it is, bring it to a dealership. you should be covered under you powertrain warranty, so you may be able to get them to diagnose it for free since it is engine related.
That is exactly what i'm experiencing! Its like im pushing down on the pedal and it takes a while to respond. It also seems like it doesnt have much low end torque. it actually has been dangerous a few times when making a left hand turn in an intersection. I tell it to go and it takes it's time lol. Ill try resetting the computer like you said. I'll also check AllData at work tomorow to see if there are any bulletins on it. Thanks for the input!

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Old 02-14-2011, 07:54 PM   #10 (permalink)
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The Buick 3.8 V-6 was a fantastic engine. I personally think GM made a huge mistake in discontinuing that engine. It was probably too reliable and too easy to work on! The more dumb decisions like this that GM makes, that are contrary to what the consumer wants/needs, the more dissatisfied I am becoming with GM. My daily driver GM car has the oil pan gasket leaking and the part is only about $20. Easy, right? Wrong! To replace the oil pan gasket, the engine has to be removed! The dealer wants $1,200 to replace a $20 gasket! Recently the Throttle Position Sensor and Mass Aiflow Sensor went bad and when I opened the hood to replace them, I discovered that they have special Torx-bit Security Pin heads on the bolts, so with the average set of tools you can't replace them! It has become quite clear that GM doesn't want their customers working on their own vehicles and is trying to force us to go back to the dealer where we can get our wallets vacuumed empty!

Yes, but even on my 3.8 you must support the engine and remove mounts, move some other parts to drop the oil pan. I think Alldata calls for like 7 hours (may be wrong, looked it up a while ago, but its a lot of labor).

Also, GM's deffinition of "normal" oil consumption on these newer cars is hillarious (well not really, its pretty rediculous)

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Old 02-14-2011, 08:01 PM   #11 (permalink)
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Yeah tell me about it... 1 qt every 2000 miles! NUTS. Not to mention my Cadillac uses 1 qt every 1000 miles. The good news? GM Warranty is the shit. When I had my Impala SS, got a replacement tranny and NEW torque converter, no questions asked. Now with my caddy, theyre about to give me a new engine, not a rebuild. So say what you want about GM, but since Ive been UNLUCKY enough with my GM purchases, theyve always done right by me.

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Old 02-15-2011, 10:11 AM   #12 (permalink)
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I am happy to hear that you have had a good experience with GM. I hope that you continue to enjoy your vehicles and have a good experience with our products.

Tricia, GM Customer Service.

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Old 02-15-2011, 11:35 AM   #13 (permalink)
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From ALLDATA:

Condition
Some customers may comment on a 1-2 shift shudder at light to moderate acceleration. Typically, the throttle plate angle parameter is 12-20% at time of condition with vehicle speed of approximately 24-40 km/h (15-25 mph). The customer may describe the condition as slip or delayed shift into second.
Correction
Replace the complete second clutch assembly with service kit, P/N 24240561. Refer to the GM Unit Repair Service Manual for the year and model of the vehicle being serviced for the 2nd Clutch service procedure.


Sounds like this might be a common problem? Sounds like i might need to make trip to the dealer...

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Old 02-15-2011, 12:54 PM   #14 (permalink)
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That is not the issue you are describing. At least it doesnt sound like it.

You described throttle lag. this website you are using is referencing shifting problems, which YES is a common problem with the transmissions on the 8th gens. Nonetheless, nothing you have described indicates that it is the problem.

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Old 02-15-2011, 01:15 PM   #15 (permalink)
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The delayed shift into 2nd is exactly what seems to be happening. If i get on it hard, its fine. But moderate acceleration like it says it hesitates shifting to 2nd to continue accelerating. either way i will probably have them check it out

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