So like others that have posted here I have experienced the so called “lag” or “lack” of throttle response from the 07 Gs at low speed. Now don’t get me wrong this does not happen all the time however, there are times where I push on the gas and there is no or lessthan expected engine response, when compared to other times

Being the ****-retentive person that I am I tried to find some type of commonality between the events. Im still working on finding the same variable that is present in each situation. Although I have been able to reproduce this ~ 70% of the time on first start up. So here is what I have noticed. Most of the time I do not put the car into drive or reverse until the car has warmed up by lowering the RMPs to ~ 1,000. But if I want to experience the throttle issue I can put the car in drive as soon as I start it (so the RPS are still 1800+) until the transmission engages and the RPMs drop to ~1,000 (because of the force of moving the car). Now don’t laugh…. but this is where I can reproduce the lack of throttle response. It seems as if the car wants the engine to be 1800+ for some reason (has been talked about here a number of times and some say it is for the smog control). So when I press the throttle there is no increase in RPM until I press the throttle pass the point where it would normally raise the RPMs past 1800. Its like the car thinks the engine is revving at 1800 so any input less than that from the drive by wire is not added to the throttle body.

The lack of throttle response goes away within 35-40 sec which also seems to be roughly the same time that it takes my G to go from its fast idle to < 1000 on start up.

What do you think, could this be possible? Any one else want to give this a try?

 

With 4600+ miles on the car I have never experienced a lack of throttle response, if anything its the exact opposite at times.

 

Does it do it in DS mode as well? exactly the same thing?

I'm thinking that in normal drive mode, it's trying to help you have a smooth start & acceleration cleanly. or are you getting absolutely no response until you pass that specified point, a dead pedal? if your getting absolutely no response.. bring it in for service.

I notice that (and it's something I like) that if I back out of the drive way, put it in drive and press the gas, it only applies a small amount of gas for the first fraction of a second, which gives me a nice controlled acceleration.

 

If I let the cars RPMs drop after the first cold start I don’t experience this issue. Nor can I reproduce it 100% of the time so I don’t think there are any problems with the car. If it does happen it will not happen again until the car sits over night.

I will try it in DS to see if it still happens.

Don’t get me wrong I was not trying to complain about it. I was just trying share what I was able to re-create to try and help others that have posted about the issue with the lag.

Audiophile –

I have also experienced the opposite as you stated. However it makes me wonder if it is caused by the same type of issue. In that when the throttle input is finally interpreted or acted upon you have continued to press on the throttle (we are talking split seconds) so the end result is a rush of power or more gas than intended.

Don’t get me wrong Im not trying to argue but it seems strange that there are a number of posts about too much and lag of the throttle.

I like the car and Im not bashing it, Im just curious.

 

I think audiophile was making a joke...

 

Actually this makes sense, if you think of the fact that this is a drive by wire then with your foot off the gas you're at point A. The engine however is at point B because you're idling at 1800 rpms which is above normal idle. As you push on the throttle nothing will happen until you reach point B and then the throttle will start to increase the rpms beyond 1800.

"The new drive-by-wire system means there is no mechanical linkage or connection between the gas pedal and engine. The system uses a sensor at the gas pedal assembly and an electrical motor to open and close the throttle plate. The system is very sensitive and takes some time to get used to."

 

Good observation Sedanman! That's probably the explanation. you have to actually push the pedal past 1800 to get a response.

 

Now that makes perfect sense...
Is there a way to adjust the "ZERO POINT" on the pedal to be 1800 rpm??