I have a 2004 G35 Sedan with Turbonetic's single turbo kit. Car has ran without a hitch for 6+ months... Tonight I was passing someone on the interstate and the car bucked and lost power/speed quickly. Under 2,250RPM, the car runs completely fine. Over 2,250, it is rev limited. In any gear or throttle position, this holds true.

I'm from the Supra world, where this would be a prime indicator of an airflow meter problem. So I'm guessing the airflow meter has taken a dive but i'm wondering if there's any known reasons these symptoms would occur in the G35?

Codes were P1271, P1281 and P1283. The P1283 code never came back after clearing codes and limping the car home. I can't find anything Nissan specific for these codes...

 

I should add that the P1271 is caused by the lack of cat. converters and is a known code that has existed since the turbo install and is not contributing to the problem...

 

dont know much about FI but sounds like your car is in limp mode

 

All of the codes relate to A/F but I can't find anything specific for them. Do you have A/F gauges - your car may be trying to save you from a lean condition?!