if i'm driving in heavy traffic the engine will slowly rev to 4000rpm or so while the car is in neutral then goes back to normal,it's happened about 4 times in a few weeks .i thought it would have went away but it did it again today so i'm getting it checked tommorow ,i think it's a vacume hose leak anybody have any ideas?

 

sounds like the throttle assembly is maybe stuck somewhere call nissan you have a warranty.

 

it only does it when it's idling in neutral,it comes back down once i put it in gear.

 

Whoa something wrong for sure. Your car is still under warranty right?

 

wow dennis that is weird. i'm stumped. it's a mechanical throttle control so it makes no sense. if it was my car i could say it was the computer being dumb.

 

Quansung, did you ever get this problem resolved, and if so, what was the problem?

(I know somebody with a similar problem, though a different car)

 

Hey Dennis, haven't seen you around in a while. Maybe the ECU is messed up with the electronic throttle?
Check out my sig and see what I have now...

 

i had a similar problem, but it turned out that my kenneth cole boot heels were hitting the gas when i hit the brake.......the problem never happened when i had my sneakers

 

I had this problem but on my automatic. When idling in D or in P, the engine would rev up to 3K RPMs. If I lifted up on the bottom of the accelerator pedal with my shoe, it would drop revs. I checked the throttle cable and loosened the bolt and gave the line some more slack. Problem hasn't happened since. You want to be careful not to give it too much slack, otherwise you'll have a problem with loose downshifts. I don't know if this is the same on manual cars and automatic cars.

Does anyone know if we should grease the throttle cable?

 

I don't think there IS a throttle cable on a 2k2 - isn't it throttle-by-wire (electronic)?

 

drive by wire.. so it must be electronic