Has anyone have problems where your Z starts to shake when you are idled? My Z sometimes have low RPMs (under 500RPMs) when idled or stopped. This also happens sometimes when I start the car and it sounds like its going to stall out. It stalls out on occasion.

I cleaned my Mass air flow sensor, and it fixed the issue, months later, it kept stalling out when I slow down, and pressing the gas won't help.. so I had to replace both of the MAF sensors (quite expensive).
But it still has low RPMs while idled and sometimes stalls out..

I'm afraid that if might stall out on the highway when there is traffic (living in DC sucks sometimes). I am thinking of replacing the spark plugs, and cleaning my K&N drop in air filter. My car is at 76k miles right now, and I haven't got a tuned yet.

Any ideas or tips..?!

 

Would clean my TBs before i do or replace anything..
G.L ..

 

What are your mods?

 

It's the 350z 2008 Nismo.. No mods, but a K&N drop in filter...

 

Usually a vacuum leak somewhere in the intake track, maybe your MAF(s) are just done, or off chance could be a bad coil but that would only cause rough running usually not the sputter and die part.

Also if you have an exhaust leak before the secondary O2 sensors it might cause something similar but the leak would have to be pretty bad, to the point where you would smell it.

I would look at those MAFs, they say cleaning them usually isnt a long term solution. Next would be a vacuum leak somewhere, but since you havent done your plenum or anything like that I would be surprised if a vacuum leak just popped up out of nowhere considering the car isnt that old.

 

Are you getting a CEL?

 

There is no CEL, no engine lights on... I actually replaced both of the MAFs last week (should I flash the car after replacing this.?). The car is not stalling out much anymore, but it does feel like it will stall out when idled (stopped) due to it having low RPMs.

 

Maybe an idle relearn procedure? Just a guess if it is not stalling out anymore but is idling differently since you replaced the MAFs.

 

How much oil have you dumped on that k&n filter?

 

I bought the K&N filter brand new, and it says it comes pre oiled already, so I haven't add any additional oil. And yes, I haven't reflash the car ever since I replaced the MAFs... Also, it did stall out once this past week when I started the car... the RPMs was so low that it stalled out....

It's funny, not sure if this matters, but it was stalling out when it was below freezing, and since it got so hot here in DC, it started stalling out again. Not sure if the weather matters, but it might make a difference..

But cleaning the MAF fixed issue for a few months, then after replacing it, I can start driving it again, but the car still feels as if it is going to stall out again.... (very low RPMs on idled..)

 

Clean the mafs again.

 

What about motor mounts?
I used to drive an 03 SER that did the same thing. Upon inspection i saw that one motor mount was deteriorated.
Good luck

 

Motor mounts would cause shaking but not a low idle or stalling.