Wow, this happened to me too. I took my car in for its 2nd oil change and the very next day i felt the same sluggish behavior you describe. I mean i know one eventually gets used to their car and that after awhile it might not seem as quick as it once did but this was a very noticeable feeling.

I'll have to try to ECU reset thing when i get back to the states in a few months see if that helps it. I have just a little over 6k miles on mine too, and it didn't do this on my 1st oil change.

Is disconnecting the battery to reset the same as reseting with an OBD scanner. I didn't think unplugging the battery would reset the ecu.

Fuel trims are maintained in a volatile memory. You need to de-power the ECU to c;ear them..

hmmm... those of you experiencing this sluggishness.... your AC wouldnt happen to be on would it? just a thought.

I have the intakes and my car takes off like a champ. However, when the AC is on, the car shits its pants.

AC on or off doesn't seem to make much of a difference. The car is just as sluggish down low with AC off as it is with AC on.

I've definitely noticed a difference like what was described with the AC on. It like wants to go but then falls on its face kind of like if the TC was kicking in.

W-e-i-r-d stuff. Hook her up to a Diagnostics Center Computer, dude!

More revs, dude!

Yep, same here.

It's even caused me to mis-time my shift into 2nd because it fell on it's face so bad from an attempted hard acceleration at a stoplight. :shakes head:

What's worse was, I was even under an over-pass, so my over-revving of the engine because of the missed gear got everyone's attention, all the way out to the gas stations on the corner! Yay! Look at me!

:facepalm:

:ugh2:

:thumbsdown:

Now, if I wanna launch hard in my Z from a stoplight => AC and VDC are turned off.

I recently changed my stock air filters and found a lot of debri, leaves and dirt, in the air box. Those with stock intakes should check. The throttle response improved instantly.

I was told by a knowlegeable NISSAN guy that if you don't use the correct oil (nissan ester) that the knock sensor will sense an issue and start to retard the power to the engine trying to compensate for this. Not sure if this is true but it sure sounds like it could be happening here, or does this sound like dealer dribble?

It's always the simplest of things.

Get some CRC MAF cleaner and hit your sensors. Did it today and it helped a lot. The car obviously is not very torquey down low, but it made a pretty big difference in overall responsiveness and pep in the lower RPMs (read street driving).

I'm thinking a dyno tune to optimize A/F ratios with the intakes would do wonders for the car...

Not quite sure why the engine oil would cause an issue with the knock sensor. Doesn't make any sense to me.

If that were the case I think we'd have a lot more discussion on poor performance because it seems like more than 50% of board members are running something other than the Nissan Ester.

Hmmm....good tip. I think I'll give that a shot. It's only $9 on amazon, plus free shipping. Do you know if Pepboys/Autozone/etc. carries it?

I bought a can at AutoZone... can't remember what I paid for it, though. I also picked up a can of PB Blaster just cause. :tup: