i dont know if its already been said but i just throw it in manul and down shift and then hit the gas..

You can just downshift without putting it into manual mode.

oh?

^Just flip the downshift paddle and it will kick down without moving the shifter into M mode.

ah then try that .. then put ur foot down

Me too
 

I've had this same exact issue for about 3 months. I bought the car in February and the issue reared its head in May. I have a 2010 6MT w/ Sp pkg.

For about the first 15min after starting the car, acceleration is fine and very responsive. Afterwards, no matter what gear you're in it bogs down for 2-3 seconds when you hit the gas. It doesn't matter if you floor it or even moderately press the gas. Oil temp, toggling VDC on/off, having Smode on/off; none of that matters either. I agree that they all play a role in throttle response but this issue is completely different, since none of those items previously mentioned cause the car to "fall flat on its face".

Nissan dealership will tell you that it's an oil temp issue and recommend an oil cooler. They will also tell you that Nismo is developing an oil cooler that you can buy. Why should I have to buy additional parts to fix an apparent problem from the factory????

^ Exactly the same issues I'm having. I don't think it's an oil temp issue because lately I notice it happening when oil temps barely touch 180F. Plus, it comes and goes. One minute the car bolts when I quickly tap the pedal in 2nd gear, and the next minute I'm flooring it and it feels like the throttle is barely opening at 20%.

Some of these issues sound like the posts about the brake switch sticking and causing the ECU to limit throttle to 15% - maybe you could get an OBD gauge or recorder and see what it reports when you have the problem.

I did this. But every time that I'm driving around with my computer hooked up, the problem won't show itself (at least not near the extreme that it sometimes does). Of course it did it all weekend, while I was out of town. Just my luck. I'll keep trying and post results for all.

Does anyone know a lot about O2 sensors? I read this article: OXYGEN SENSORS and it makes sense. Is this accurate? Does it apply to our car? If so, I am going to record just O2 sensor data this evening, and try to post it tomorrow. Even if the problem doesn't show itself today, maybe it'll be a good baseline. Can anyone confirm how many O2 sensors I should expect to see?

o2 sensors have nothing to do with this problem, or much of anything in all reality, except pollution control.

Well, a primary O2 sensor being out of whack could cause your fuel trims to be pretty extreme. That would lead to kind of a "dead" feeling every time you crossed over from closed to open loop fuel operation.

But if it were that bad, your ECU would let you know about it (service engine light).

Secondary O2 sensors have no bearing on fueling or how the car runs. They are the "rear" two sensors downstream from the catalytic converters - one per bank.

So anyone talked to a dealer about this yet?

KillerBee370 also mentioned his tuner fixed this (see page 13)....
What was the fix...??

while yes, in theory, you are correct, but ive never seen a sensor cause such havoc. for all intents and purposes, the o2 sensors are mere monitors and even bad ones wont cause fuel trims to change performance, noticeable anyway. but who knows, this car has proven to be a very weird car already in other ways.

Agreed, however, if the ECU algorithm is jacked, I think it could cause exactly that. I just realized my OBD software won't let me save data, so I can't post my drive =( Will keep looking for other software.

Has anyone had this problem in the evenings? Or mostly in the day time?