OK so as stated, if I drive hard while on the highway and put the car in neutral,
the rpm needle just keeps falling all the way down and shuts down the car.

Most of the times this happens only from 3de gear and up. I did pull hard in 1st and nothing and did the same in 2nd and nothing only happens in 3de 4th 5th didn't try 6th speed.

Car drives fine, no problems to start while shutdown, no error code before shutting down.

 

The car is just tired and needs a rest after doing a hard sprint. Let it catch its breath and then you're good to go.

Do you have an aftermarket intake of some sort? Have you ever tried cleaning your MAF sensor with electrical contact cleaner?

 

I have the injen intake and yes I did clean it. The thing is sometimes it does it and sometimes it doesn't do it.

 

maybe give it a little rest dunno lol

 

Am i the only one who finds it funny that his username is Toomuchboost and the thread title is " car shuts off hard while driving " ...LOL

That aside. Check your oil, trans oil, etc..

 

do a search on the Engine section, there's allot about car turing off when going after market intake.. I too had this issuse on both my G after changing them out with and after market intake it would do as you decribe. Try to reoil (more oil) your intake, and resetting your ecu.

 

read the last page of these instructions. did you remove that piece?

http://www.injen.com/galleries/produ...directions.pdf

 

I used to neutralize the car while running at 70 mph just for the heck of it.

I quit after I got the stillen intake and had the same problem... at 70 or above, the car would shut off. After reading that INJEN manual and a previous response here, I believe it is air turbulance. Maybe I need to put more oil in the filter to prevent that problem!

Another suggestion I got once before was "increase your idle rpm"

I love this forum!

Adrian

 

umm.... my car does this stock... 2007 g35 coupe manual...

 

My friend had this same problem with his maxima, he cleaned his MAF sensor with MAF sensor cleaner and the problem hasn't come back