Finally someone else gets what Im talking about. We need some kind of specialty flash for this.

 

Get a grounding kit



My M mode downshifts are much smoother now. And it may fix throttle tip-in issues (I've always thought mine was good tho)

 

You've said it yourself though, the rental G's you've driven don't do this. Might be hard to get a special flash, but wouldn't really any Cobb/Uprev type tune would achieve the same results?? Essentially I think they they re-map all the settings, including throttle response, shift times, etc.

Honestly if there's an issue here I would continue to pursue it with the dealer or maybe trade it in. That would be my excuse to the wife anyways to get a G37 . Test drive the next one you get to make sure the issue isn't there. Otherwise personally I would also consider an S5 (sweet car) and maybe a 335xi.

A grounding kit is not a bad idea either. Definitely improved my M shift lag and shifting in general seems a bit smoother.

 

I was only half serious, because it seems ridiculous you should have to put an aftermarket part on the car to try and fix a problem the dealer can't handle. But in all honesty, if it works it may be worth the $60-80 investment. And if not, I'm sure you can sell it to someone else around here.

 

I noticed an acceleration problem with my transmission (as my G-35S 2008 was driven from BNA to HSV)...my local dealership RESET the transmission and the problem was IMMEDIATELY corrected...you may want to consider the same...have the dealership reset the transmission...hope your problem is rectified soon.

Sir Lennox

 

Yep I can also verify that. As I sometime will shift into DS hit traffic and then finish driving home in DS mode like my grandmother.

 

Well as the original post stated, this is a chronic problem just driving in regular D mode and coming to a gentle stop. Its my wife's car and for the price you pay for this it should be better than a cheap Kia or Sentra when stopping at a light. I'm not willing to put aftermarket stuff or other things to fix it. Just need to know if other "stock" G's have this issue or if someone knows a way to escalate the issue higher up in the Nissan/infiniti corp.
The car's a nice car but its supposed to drive like a 'sport-luxury' not a pure sports car. When driven hard its supposed to respond but driving around town lazily it should be smooth. Thanks all!

 

For the record I don't have your problem. Mine only down shifts hard when being driven aggressively. When being driven at normal speed in D or DS my downshifts are pretty smooth.

Don't know if this has been suggested but maybe resetting the ECU might help do the trick.

Also there are people in this forum and in the My37 forums complaining about a similar problem with the 7 speed.
https://g35driver.com/forums/g37-sed...ming-stop.html
http://myg37.com/forums/g37-sedan/19...37x-sedan.html
Good luck.

 

Are you referring to the car in stop n go traffic? There is athread about the car going into a very "weird" downshift at about 20 mph or so in stop n go. That was happening to my 2005 Altima SL v-6. It's either the torque coverter or the valve body in the tranny, not the tranny itself. In the Altima they replaced the tranny, it was worse. My mechanic told me it's the torque coverter. never got to the bottom of it, the car was leased and turn in approaching, so let it go. It happened after about 20k miles or so. Check into it.

 

I've had this problem for the longest since I've owned the car, and I thought to myself that it was just how the car was made...Until I drove the exact same model and got a different throttle feel. The car in question is 2007 G35x 5AT with premium, navi, no tech package. It is present in almost all stopping conditions, but extremely prevalent in light breaking situations when there is more engine braking, gear negation vs. brake usage. Brakes are applied around 20-25 MPH in 2nd gear, and then it will feel as if the car is jerked backwards. Then 1st gear is engaged, and everything is fine. Sometimes I get the same "wall" feeling when upshifting from 3rd to 4th. It feels as if there is a complete loss of power, then a sudden rush of torque between 3rd and 4th when the car is shifting in the 3-5k band range. More of this phenomena can be replicated because I also have "throttle lag". I mash the gas pedal for 2 inches, nothing. Then a little bit more, and I get all the power at once, and the tach goes nuts =) Even weirder is that all of this happens in "D" but not "DS". I can eliminate these jerks in M mode when I do a bit of rev matching during fast downshifts.

I've read earlier about resetting the ECU by disconnecting the Battery. Should I be worried about navi or radio codes?

 

jojo35: Have you had any of the TSB ECU updates applied. You should have the dealer look at it. TSB 07-028 is one that addresses throttle sensitivity, cruise control issues, etc. I had that applied last year. I experienced a harsh upshift into 3rd gear primarily a few months ago. Dealer replaced the Valve Body in the transmission. Now much better, but not perfect. A few weeks ago, bringing my 07 G35X in for service, the Advisor applied a TSB 08-017. THIS WAS A MISTAKE....It chnaged the 07 into an 08, slight hesitation and chnaged shift points. I protested, went for a drive with the Service Manager [a very nice cooperative guy, btw] he acknowledged the mistake - I didn't ask for it. I read this forum, and other members warned how this ECU update was not favorable. Anyway, the Dealer replaced the ECM - ordered new and insured that it was not REFLASHED with 08-017. Now it drives like old..... not exactly, but pretty close. I like the sensitive throttle... Your problem I think is in the Torque Converter or Valve Body in the Tranny. See my earlier comments about the same experience in an Altima v-6.

 

almatti, thanks for the help, it was what I was looking for. Let me clear some things up first. I haven't done anything to the car in terms of the ecu. When your car got the ECM replaced, did you reflash to TSB 07-028?

 

jojo: I don't know. It may be since the ECM was replaced from the factory according to the dealer. It is less hesitant and more like the 07 I have grown to enjoy and love. The car is awesome overall though, despite some flaws.

 

Just a hunch but it sounds like a problem with the lockup torque converter clutch (TCC) or the solenoid that controls the TCC. If it's locked-up in 2nd gear and downshifts hard into 1st, that sounds like a problem worth getting fixed by the dealer. Try contacting Nissan (Infiniti?) Customer Service's national office and see if you can get any where with them.

I don't know squat about cars but I do know that it is always better to get the manufacturer to fix a problem when it's under warranty than to try some work-around.

BTW, I'm surprised it didn't throw a code. The tcm and ecm are usually pretty sensitive to stuff that isn't working right.

Good luck.

 

jojo & calejohnson: Yep, that was the problem with the 2005 Altima SL, V-6 I had a few years ago. Threplaced the Tranny, my mechanic saod that it was probably the Torque converter....I never did go back since this all happened toward the end of my lease term. The Alti did the same thing: in traffic on the highway, say 20-35 mph range, she would abruptly shift down in "jolt-like" fashion. If you Punched the trottle, this did not happen & it was better in Manual Mode Auto shifting. It had the 5 speed Auto tranny. Good luck jojo..Post your results to inform us all.