I am driving a certified preowned 2007 G35X with roughly 32K miles on it.

First of all, I just found out from another member that there exists TSB's for cars which I was completely clueless about which makes me feel like a bit of a an idiot but I am not a big car guy.

Either way after a bit of research I found few that I am interested in looking into. One of the ones I have a question about is TSB ITB08-017.

The problem I've noticed is when accelerating when I need a boost in speed. For example, this happens almost every day when getting on to the thruway on the way home from work. After getting on the on ramp and when it's time to change lanes, I usually hit the gas and try to get enough speed to not slow down the cars that are already in the left lane. They are doing about 65 to 70 mph usually. When I hit the thruway at the end of the on ramp I am usually doing 25 to 30 mph. Most of the time when I hit the gas, the acceleration is minimal until about 2 to 3 seconds of holding down the pedal when the I feel a sudden jolt and my RPM meter hits about 6500 to 7000 rpms for a few seconds until the car hits 70 mph. I guess my point is it's not a very gradual acceleration to 70 mph.

So what I am trying to find out is A. Is this truly a problem or am I just a fast driver? B. Does the ITB08-017 TSB address this issue if this is truly a problem?

I am trying to attach the PDF for this TSB but it exceeds the upload limit. But here is the link to the PDF itself:

http://2007.infiniti.g35x.googlepages.com/ITB08-017.pdf

Here is the description I've found for this TSB

Description: 2007 INFINITI G35 SEDAN; THROTTLE SENSITIVITY
Slightly increased throttle sensitivity at low RPM.

 

there has been several discussions on that TSB. If I recall it addresses the "touchy" throttle response in which you slightly tap the accelerator and the car jumps forward aka the snap neck effect. I think what you're experiencing is more of a lag in response?

 

Yes exactly. There is a lack in responsiveness. Great way to put it!

This doesn't happen all the time, it's when I need a boost right away, like I mentioned to get in to the left lane and get up to speed so as not to slow down the cars behind me that are already at peak speed.

 

When you push the pedal down in Drive it tells the computer to downshift, there is a delay from flooring it and the computer downshifting, thats why the revs shot up and then you feel power.

Go into manual mode and when your about to give the the gas shift your self down to 3 and then hit the gas no delay now right?

 

thescreensavers,

So, I am assuming this is normal when driving a automatic? I am not good at manual mode at all since I am not really sure what I am doing. This is the first time in my life I am driving anything with such power and I love it.

 

Yea, theres nothing to manual mode, no way to hurt the car there is a limiter and it wont let you downshift if your going too fast for the gear.

give it a try, See how it works.

I drive in Manual mode the whole time since I hate how it works in D :O

 

I agree with thescreensavers. What is happening is that the computer is trying to interpret your increase in throttle pressure. In normal Drive ("D") mode, the car is more reluctant to down-shift in order to save gas-mileage. The engine revs higher (probably in the 3200-3500k range) but in the higher gear you are not feeling a lot of power.

When you push even farther down on the pedal, the computer realizes that you mean business and downshifts and your tachometer jumps to 5000-6000k (which is jarring to say the least).

If you switch to DS mode, the computer will typically downshift for you much quicker and with less coaxing. Quite frankly you won't even need to manual shift for just getting onto the freeway; the acceleration should feel more reponsive. The problem with DS mode is the car is now more reluctant to up-shift and you will stay in higher revs with more acceleration than is necessary for normal driving. I typically get up to speed and then shift back into D mode (until some punk tries to pass me).

As for TSB ITB08-017, when I first test-drove the 07 G35, I must have given the dealer and my passenger whip-lash from the over-sensitive throttle. This too is caused by the ECM computer and can be fixed with an upgrade at the dealership but to be honest, after about a week or two of getting used to not pushing the accelerator more than a centimeter when moving from a stop and then gently increasing the pressure; I have no problems with the sensitivity (although my wife sure does).

 

If you want the gradual acceleration that you stated then gradually press the throttle instead of jamming your foot down. The problem as your describing happens to everyone, if you're already crusing and then proceed to floor it, you won't instantly move anywhere since like others have said the car first downshifts then once you are in 3rd you feel a great acceleration since you are high in the rev range.

 

i have a similar issue in my 07 g35x. I literally go no where until about 2k rpm from a dead stop. Ive learned to ease into it, but it really is strange to me

 

wow this sounds like the exact same issue i went though today for the first time.

Wanted to increase speed and put my foot down..kept putting it down as it wasn't going when i wanted it to, then you feel a little thud and it really goes..there seemed to be no happy medium.

 

Really? thats weird... i never had this issue. i have power available all the time. Maybe u guys are babying ur car, should reset ecu and drive it hard for a bit.

And the TSB is to reduce throttle sensitivity which is the complete opposite of what ur complaining about

 

Disconnecting battery and pumping brakes?

 

Everytime i reset ecu i just disconnect battery for 10 mins thats all