I've recently noticed the transmission acting funny when cold.
Every morning, I always reverse onto the street, than I put it in drive and continue on for 500 meters, where I stop at a stop sign.
The intersection itself is raised so the point where I stop is at an incline.
This is where I noticed the tranny acts up. I take my foot off the brakes and give it gas, but the car will roll back a bit before it feels like it engages and jerks forward. It almost feels like revving it in neutral and than putting it in drive. It does not happen every time, but enough for me to take notice.
Today it happened after I've driven for 20 minutes and pulled in to drive through to grab a coffee....
Any ideas?

 

I don't know what's wrong, but I'd have a dealer look at it if it's still covered under the powertrain warranty.

 

Very well described. I have noticed the EXACT Same issue on my 2010 X Sedan, pretty similar conditions:
Reverse out onto the street -- Car into Drive -- feather the gas and roll about 200 ft. to a stop sign, which in my case is on a very slight decline vs. incline.

It happens only in the cold, only on my first stop and start after reversing, and maybe once a month or so. I've come to notice that it only seems to happen when I come to a complete stop. I've recently made an effort to ever so slightly roll the stop sign and haven't experienced the problem when doing so. It's a very strange sensation but the description of the car feeling like it's in neutral and then dumped into drive is pretty much spot on.

Unfortunately this is not a "solution" but maybe something to try and see if it works for you (might be harder on a incline vs. decline).

What year and model? Any mods on the car?

 

It's a 2010 G37 journey. I've recently installed a vLSD rear diff, everything else is stock.
I'm not sure how this would cause the issue.

 

Cold ATF is obviously going to flow more slowly, so your transmission wont be as responsive as it is when warm. That said, how many miles on your last ATF fill?

 

I'm also considering the possibility (albeit slim) of this issue being caused by one of the brake components, like a sticky caliper or something. Is that totally far fetched? most commonly happens in the cold when fully engaging the brakes for the first time at slow speeds? Would also kind of make sense that lightly riding the brakes and slightly rolling the stop seems to alleviate the issue... just a thought...

 

True, but would that explain the sensation of revving in neutral when an AT car is in Drive..?

Tranny fluid, transfer case, and both diffs, done no more than 4 months ago.

 

No, that is certainly abnormal behavior, but cold fluid could explain slow engagement. What fluid did you use when you changed the ATF? If the viscosity of the fluid is higher than spec, it might have gone unnoticed until the weather cooled down

 

Nissan Matic S - Changing the tranny fluid actually noticeably improved shifting and driveability, but I still have this issue every once in a while in the cold.

 

I just got a brand new transmission n my G, updated the software to something similar to the q50 software (g2 love having friends who are infiniti techs lol) An when its really cold, this still happens, although not as extreme as your description. Once it warms up for like 5-10 minutes, it runs perfectly fine.

 

you're probably just experiencing the torque converter staying unlocked to help warm the transmission fluid. The "jolt" described above is the concerning part

 

Did you DIY or have a mechanic do it? If the latter, are you sure they are using Matic S?

how many miles on the car altogether? Still under powertrain warranty?

 

Tranny was done at Nissan dealership and I am sure Matic S was used. I literally called about 10 Nissan & Infiniti dealerships in the area and talked to the head techs to find a location that would meet my expectations.
https://www.myg37.com/forums/g37-sed...-schedule.html (#13)

62K on the clock. I'm not very familiar with the length of ownership and mileage restrictions as it relates to the powertrain warranty. I also bought the car used so I'm not totally sure what that does to any warranty from the factory either.

I do have a lifetime powertrain warranty through the dealership I bought the car from, haven't done much looking into that but i would imagine there would be a lot of red tape utilizing the warranty until a covered component actually fails..

 

Powertrain is 6yr/70k. Might want to have them check your ATF levels to make sure it recieved a complete fill and have the latest transmission updates

 

Experiencing this same problem, except I am on a level road and the car doesn't roll back. I get the same jerk as if the car was put in neutral/park for a second before engaging in drive. Looking up the symptoms, it appears it might be a delayed engagement.
Only happens on a cold start and goes away as the car warms up. 2012 S Coupe 7AT, 97k miles.

Anyone else have a similar problem and found the solution? I know we're not required to replace the tranny fluid but could that fix it?