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Old 07-14-2009, 11:11 AM   #1 (permalink)
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Throttle Response

Hello all, first post here. Haven't done forums in a long time so excuse my etiquette if I screw up.
I was smart enough to run a search and didn't see anything that jumped out at me but I'm sure one of the board gurus (all boards have them) will be able to point me to the thread if it exists.

OK, so here's the problem..............

2008 Impala LTZ 3.9 ordered from the factory and received June '08. (and for those curious about my screen name, yes I got it FREE! Actually my wife won it in a contest at work....cool huh!? )

Anyway, back to the issue at hand....
We love the car and have had little to no complaints about it in this first year. However recently I have discovered that I believe it is trying to kill me. How? By way of a lagging throttle response. I never noticed it until after we took it in for the A/C recall and an oil change. Even then it wasn't immediately noticed. However as time goes by I am having more and more issues with it. I step on the gas and it seems to take 1-2 seconds before anything happens. I don't drive like too much of a madman so it's usually not an issue but more than once I've found myself needing to yield and then hit it to get in traffic in the slot, I hit the gas and......nothing. Then it spools up and takes off like a bat outta hell.

I've read somewhere that it is because it's electronic instead of having a wire to the carb and that it adapts over time to your particular driving habits. I've also read that there is a way to reset it by pressing the pedal down slowly and releasing it slowly with the ignition on and motor off.

My question here is.......
1) Has anyone else had this issue?
2) Does the above method actually work?
3) If so what are the correct instructions?
4) If not, any suggestions to correct it that do work?

As I said I don't drive like a madman too much but when I hit the gas on a $30K car I expect it to respond at least as good as my 10yr old van which the LTZ just doesn't.

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Old 07-18-2009, 07:52 AM   #2 (permalink)
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Wow, 38 views and nobody else has had this problem or one similar? :confused:

Guess I'll take it back to the dealer and have them check it.

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Old 07-18-2009, 10:48 AM   #3 (permalink)
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Quote:
Originally Posted by FreeLTZ View Post
I've read somewhere that it is because it's electronic instead of having a wire to the carb and that it adapts over time to your particular driving habits. I've also read that there is a way to reset it by pressing the pedal down slowly and releasing it slowly with the ignition on and motor off. .
the PCM is a "learning" pcm so yes it does "adapt" to your driving habits. Not sure on the reset proceedure (7th guy) but you could always try to disconnect your battery for ~1/2hr , reconnect take it around the bolck a few times stomping on it from a dead stop and see it that works

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Old 07-20-2009, 11:33 AM   #4 (permalink)
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Once in a while I will notice something similar, but the lag is nowhere near a full 1-2 seconds. It is more like a fraction of a second. Also, it doesnt happen when easing onto the gas, but when taking my foot off the gas, the throttle will (very rarely) take a fraction of a second to respond.

If your throttle response is actually detrimental to the way you are driving and potentially hazard causing, you should probably get it looked at and corrected. Regardless of the way the system adapts to your driving habits, the throttle response should be accurate in terms of foot on the gas/foot off the gas.

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Old 07-18-2010, 08:10 PM   #5 (permalink)
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Sorry to resurrect an old thread, but our 09 LTZ 3.9L does exactly the same thing and the dealer keeps telling us they can't find anything wrong. It also gets 24-25mpg on the highway which is worse than any car we've had in the last 10 years. Our 2000 SSEi was always in the 30mpg range on the highway and also our 2004 Grand Prix and our 2006 F**d 500 Limited. There has to be some correlation between the hesitation and throttle position. It seems like we have to press way too far on the accelerator to get the car moving and if I'm not mistaken, the higher the throttle position the higher the demands on the injectors.

Anyone else had any issues and hopefully a possible fix? Our dealer continues to stonewall us.

Thanks,

Lynn

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Old 07-18-2010, 09:06 PM   #6 (permalink)
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You are complaining about 24 MPG? I cannot get past 21 MPG with my '09 LTZ so far. I tend to drive rather fast on interstates, but nothing crazy - about 80 MPH and accelerate normally. The car has good throttle response, no complaints at all about that.

I would recommend a few things to those complaining about throttle response. Use some Chevron Techron injector cleaner in you gas tank, mix one 12 Oz bottle with about 8 gallons of gas and run until the tank is almost empty. Do another treatment if you do not notice immediate improvement. This stuff really works.

Also, try different brand of gas. I have found that some of my vehicles run better on certain brands of gas. Could be different additives.

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Old 08-02-2010, 10:42 AM   #7 (permalink)
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If you buy cheap gas then that can cause your problem, I buy 93 everytime...

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Old 09-02-2014, 11:55 AM   #8 (permalink)
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every get resolution on this thread?

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