No sign of this problem on our 2012 G37 7AT with over 3,000 miles. I think they fixed it in the 2012 model year.

It's strange that they don't have a software fix for earlier models yet - maybe it can't be fixed just by reflashing the software.

 

I'm sure they could fix it with a reflash. All you have to do is to reset the ECU and the problem is gone for about a week or 2. Based on this observation, I'm concluding this is not a hardware issue.

 

Mike, I'm with you on you last comment. 25 years of owning new cars, and never once sold one in less than 6 years. This G Trans problem really makes me sick since I love the car otherwise, but can't get past the numb feeling of the accelerator. It is a disappointment to drive every time I get in it, and I'm a car enthusiast so it hurts even more.

 

I'm hoping they just want to get more actual street-time data to make sure the AT is performing as it should. Either that or they don't want to publicly admit there's a problem w/ earlier models' ATs. I sure hope they've got it sorted out by now, damn it's been 4 years

 

My guess is that they view it as too minor of a problem to justify reflashing hundreds of thousands of cars.

 

THIS is exactly what I am (really really) hoping is going on. Can't blame them for wanting to make sure it's good this time. If they do release an update, they won't reflash thousands of cars, and won't make some kind of announcement about it, it will just be a TSB for people who complain about lag, just like the 075A TSB was for those who complained about other symptoms.

By the way, I have an appointment with Infiniti again tomorrow to drive a 2012 again and demonstrate my 2011 to them.

 

Visited Infiniti again today.

The 2012 definitely does not have the problem. I can duplicate the problem on my 2011 several times in a row. I can not get the 2012 to do it.

The 2012 has a different software version. Now we have to just wait and hope Infiniti does the right thing for our 2011's and releases a TSB to update those of us like myself who experience this issue frequently and want it fixed.

The technician who rode with me and observed it knows about this, it is a "throttle response issue". He said "it is worse on the sedans". He says there have been a number of updates for this throttle response issue already and the impression I get is that there will be another update. He took the time to discuss with me the ECM's decision making process involving the variable valves and the throttle that the ECM must do when you press the go pedal, combine that with coordinating things with trans gear changes and this is what we have - momentary ECM confusion.

Infiniti is keeping the dealers in the dark so nobody knows when or if an update will come. The service mgr has a call into Infiniti to see if there is anything else to be learned, and the tech said he knows some knowledgeable people who he can mention this to.

I also want to mention that an ECM reset does not get rid of the problem for any amount of time. It is present immediately after the ECM reset. The dealer reset it, and within a mile drive of the dealer it did the lag thing twice.

I have to say that I am slightly more optimistic - I am glad the 2012 does not have the problem - and I'm going to hang in there and wait for Infiniti to issue a TSB for the rest of us to get this apparently bug-free (knock wood) update.

 

Nice recap, it does give us pre 2012 7AT owners some hope. I'm fairly certain Infiniti will release an update once they confirm that it is performing as it should. I'm sure a good majority of G sales are repeat customers (I'm on my 2nd), and to leave 3 years worth of AT equipped sedans in the lurch would be horrible for future sales. Thanks for keeping us informed

 

Update on my 2012 RWD. After 2200 miles of my normal driving, which is to say, Im fairly easy, my 12 is feeling great. It is much improved over my 09....almost perfect. I feel no lag and slowing down is much improved.

 

09x (JU61C ECU), Uprev tuned, the lag/engine brake is gone, but the flare is still there in 3rd. The car seems to bog down a bit when going uphill in 2nd or 3rd, I'll have to get that adjusted.
I just learned to deal with the quirky transmission and love that my car accelerates like a bat out of hell.

 

It's interesting that you mention when it happens. Mine does the same, but most noticeably when going uphill after being at a total stop, then making a 90 degree right or left hand turn. I can accurately predict two roads where this happens 95% of the time, and most other places are normal shifts. See if you notice the same.

 

Yes to going uphill after stops (I almost have to floor it if I want to merge lanes uphill, otherwise it's just a lot of noise with not much go)
No to the 90 degree turns, it's actually too aggressive on turns (maybe it's also the sway bars).

I'm having my tune adjusted next week, we'll see.

 

Excellent Recap. I haven't posted to the thread for I have almost given up Hope of any fix. I will contribute ChiDave's comments: I am driving many various cars for over 40 years (including my father's cars), American company cars, and more recently, Nissans, Hondas, Subarus, and 2 Infinitis (2007 G35X and my 2010 G37X). This car "makes Feel Sick"....too. IFA will not Given in to a lease termination without further cost. My Dealer - one of the biggest in the USA , Pepe Infiniti in White Plains, NY , can't do anything about it.

So the next step is to increase the pressure> Letters to my attorney, the Attorney General of NY , Consumers Reports, the local Fox Consumer Advocate reporter (for good measure) and Better Business Bureau of NY. I will send it to IFA with the appropriate CCs. I just want OUT of the Lease without any further financial obligations. i even offered to just swap ouit into a 2012 M37X , not happeneing without laying out thousands $$$ for the early termination. I have NOT driven the 2012 M, but there are scattering reports (Edmunds.com), they "feel" this too....

 

Ok, so just looking over this damn thread has got me seriously thinking about getting an 09 G37sedan over an 08G35 sedan.. I wanted to get the G37 because of the warranty, but this has me seriously thinking about the 08.. Do the 08's have these crazy jerk problems? Do you think the G35 would be a better choice at this point than the G37??

 

I've had an 07 5AT and now own an 09 7AT, you'll get a couple extra mpg w/ the 09 and once you get used to the 7ATs quirks it's something I've been able to live with but still hoping one more software patch will make it just right, we'll see
The 5AT w/ less gears is more decisive and is better at keeping the rpms in the sweet spot on the torque curve, at least that was my experience. It was also nice when cruising to be able to step on it and immediately be able to launch for a pass, the 7AT can be a bit hesitant.
I'd be sure to take the 7AT on an extensive test and see for yourself. The worst thing about these cars is the paint IMO, everything else I've been able to live with.
Good luck w/ your search.