I have an 2004 DG MT G35 coupe and about a month ago, my car started to get the shakes or idle kind of low.......the idle is not too bad......you notice the idle when the car is sitting still...... So I finally got around to take it to the dealership to let them have a look....... They noticed the idle and hooked up the ECU to check things out..... Well they told me that everything was within operational specs and that they could not do anything about it....... I talked to the service manager and asked if it might be a bad spark plug, clog fuel injectors, or maybe the timing was off, etc.....well he told me that there are so many sensors on the car that it would throw a check engine light......so that was that..... the other day, I decided to run the car pretty hard...... and noticed that the car does not pull as hard as it did......even at around 4000 rpm........ its like the car is lossing horsepower and torque...... I figured I would post on the forum to see what some of you guys think what the problem might be........ so that I can tell the dealership......

Oh, I forgot to mention that when the dealership looked at my car, they supposedly fix the problem with the gas tank shutter valve......but the past two times I filled up my tank, the problem filling up still happens.....so I'm thinking that the dealership really did not look at my problems with the idle and gas tank valve...... I want to fill a complaint with Infinit, but was wanting to know what you guys thought first......

 

try another dealer..

does it stop shaking when u put it in Neutral and just bring the gas up to 1k rpm? is it more noticable during cold starts? hard runs? more info please

 

I experienced some very mild idle shakes a while ago, and told the dealer to look into uneven idle problem, and they told me I had "bad throttle body" and it was changed under warranty. Everything was fine but after about a month, I started noticing that my RPMs drop below the usual idle speed when coming from high RPMs, so I'm sure to mention it to them on my next oil change. Other than that, the car rides fine, and I never know if it feels faster or slower, cause I dont always push it to the same limits and on the same roads, so too many variables are out there that are never constant, like outside temperature, slope of the street or gasoline(if different gas stations), so it's really hard to say if it actually is faster or not. It's fast enough most of the time.

 

+1... You need a new dealer.
My guess is that it's either a bad/dirty throttle body, or a vacuum leak .

Get the new dealer to check your gas tank again too.

C.

 

Take it back to the dealer where the original owner bought it. They tend to take better care of their own cars

 

Might be weird but have your reset the ECU? Just a thought.

 

mine always loaps more on winter gas.. every VQ nissan I've had does it, the G more than the others tho.

 

i have the same problem, and it comes and goes. happened for the 3rd time for me last week, and this makes the SES light come on. the problem always goes away after a little driving around. my warranty is almost over soon, and i am not sure if the dealer will say that its caused by my mods...

any advise (not a "guess") will be appreciated.

 

my 98 240sx used to do this as well.