I dont have any throttle surge issues with mine.

 

Hey John...Thanks for the reply. However this has NOTHING to do with braking or pedal placement. From a standing start my 08 G37S AT will lurch forward.....Infinit of Charlotte says they never heard of it but will gladly reprogram my computer for $100. I read somewhere on this thread or a similar one about a TSB regarding this problem, but could not find a copy or a link to it. Any input? This is very disconcerting and potentially dangerous for my wife. Thanks..........Ken

 

here is the TSB about the slight RPM surge.

http://www.infinitig37.com/TSB/ITB10-075.pdf

here is a list of other tsb's.

Infiniti G37 Technical Support Bullitins

i don't know if infiniti actually maintains this site though.

 

have had a similar problem. While braking at a red light, my 2009 G37 starting surging, I applied more brake pressure before putting into neutral, and the rpm went up to 4000 before settling back down.

 

Have had this happen with my 2010 G37x (105,000 km) - a few times over the 3 years I have owned it and there are a couple of examples of this happening on the NHTSA complaint site as well. It seems to be a strange anomaly that no one can explain.


Usual happens when braking and coming to a stop at low speed - the engine will suddenly rev up to as high as 4500 rpm (in my case) - the brake will hold the vehicle back and I neutral slip the transmission and engine revs quick drop back to normal idle. Have discussed with Infiniti technical specialist and they are mystified.


A major safety issue if you are not quick to react.

 

I actually had this happen to me the first week after I bought my 2012 g37S a month ago. Slowing down from 60 to 10 and felt like the down shift from 4th to 3rd pushed me forward.

These cars seem to really like to engine brake anywhere below 50mph when slowing down. With this, it makes me believe that while the AT is downshifting, because of some lag between the shifts, the initial break pressure used to slow the car down becomes ineffective for the time between shifts until the engine breaking kicks back in when the lower gear engadges. Iv already taught myself to apply the breaks in a firm and decisive manner.

Also, atlease for the bbk, they pads/rotors need to be kept proper or the low speed breaking becomes problematic. When I say proper, I mean the pad material needs to be coated on the rotor for the breaks to be effective at low speeds. A few 60 to 10 hard breaking consecutively to reestablish the pad material on the rotors makes it run proper again.

Surging at a red light sounds like a leak after the throttle boddies or even just a dirty TB, but I would assume this would have been the first thing any mechanic would have looked at.

 

Sounds like rev matching to me.

 

Definitely is which I have no problem with myself, but makes braking a bit difficult if you aren't expecting it. I think one of the transmission tsb/reprogram actually removes revmatching from normal drive mode but leaves it in ds. I believe my 2012 does not have revmatching in drive mode on slow down only when i want to accelerate but I usually put it in ds if I'm driving it hard. Even without the revmatching there is still a longish lag between down shifts and the lurching can be felt during this.

You can feel what i mean about engine braking on these cars just comparing rolling resistence from 0-50 against 60+, the 0-50 i always feel like the car is working to keep the speed and engune braking as soon as i pull off the throttle. while at 60+ much less effort is needed and it coasts at speed much easier.

This really just leads me to think that the 7at feels like a 5at with two gears thrown in the bottom end instead of having all 7 fully fleshed out if that makes sense.

 

I have the same issue and it’s come very close to causing very serious problems for me. I cannot stress enough how intense the surge is. Simply releasing your foot from the brake causes the car to leap forward. I’m in no way surprised it caused the amount of damage it did to the person who had the accident. The ONLY way I can manage it when it happens is to very, very slowly release my foot off the brake. It’s super intermittent with no apparent cause.

2008 G37 Sport Coupe (with ~224k miles)

 

Might want to read this post especially if you have the 5AT. The ITB solved my issue and the car idles flawlessly.

 

Wow, a lot of people need to look up the Wikipedia article and actually read it about the Audit 5000 unintended acceleration case. The root cause was simple: people had their foot covering both pedals, and they were nearly in an accident and pushed their foot down more, the added gas pedal input raised engine speed (RPMs) and lengthened their stop when they really needed extra braking. That matches your description. People make mistakes. If you had telemetry I suspect we'd find that there was both brake and gas pedal pressure present. That is also why you should never use your left foot for the brake and right for the gas, since in an emergency you'll simply hit them both.

Sorry to hear it, good luck.


Rick