Hi all, this is my first post; sorry if it's in the wrong area. I have a 2009 G37x and when I start it up after not driving for a while (a little less than a week or more) the car wont move. I'll slowly put my foot on the gas pedal and the RPMs will go up but the car itself won't move. It feels like the car tries to get moving then gets caught on something. I have to put my foot down much harder than I'm comfortable with to get it to start moving and it lurches forward with a very disheartening sound coming from the rear. It sounds like metal on metal and it's not pretty. After the initial move it's fine, however, and when I'm driving it daily there are no problems getting it moving whatsoever. I've been driving it for 2 years so far, and this started happening in late winter/early spring of this year. I passed inspection at the dealership after this started happening, but I didn't think to mention it because it wasn't as bad back then. I'm worried it may have something to do with the transmission. I searched on the forums for a while but I couldn't find anything like this. Does anyone have any idea what could be causing it?

 

My money is on a sticking brake piston.

After driving the car a while, pull over somewhere and touch each wheel carefully. I expect one to be much hotter than the rest.

 

Or pads are sticking to rotor. That was a common occurance on my Miata.

 

Indeed...it's the rotors developing surface rust after sitting for a while.
NO need to be worried.

 

Surface rust is one thing, but having to give it significant additional throttle to get going is an issue.

 

I agreed with those above mentioning it being the brakes. I think its a combination of whats been mentioned though. I just dealt with this on my wife's Honda. just a wild guess but your rear brake pads are due for a change?

In our case, I think it happened b/c the pads were pretty much close to completely gone and letting the car sit for two weeks through the up-down temp cycles in April along with a ton of rain caused what was left of the pads to rust onto the rotors. As soon as i put it in gear I could feel the car stuck/not moving, gave it a bunch of gas and I heard a loud cracking noise from the rear axle and it drove fine after that....when I went to change the pads it was metal on metal...the piston wasn't stuck though.

just my .02 if it helps

 

Thanks for the responses! New brake pads are second on the list to some new tires, because it's about that time. I didn't even consider the brakes but the explanations make perfect sense. Thankfully it's not something worse!