swirl valve is located cloce to throttle body has two vacuum tubes
P1131 swirl cont sol/v
swirl control valve/solenoid control valve malfunction
P1130 code which reads something like "Swirl Control Valve Solenoid Control"
Swirl Control Solenoid Valve
Swirl Control Valve Control Vacuum Switch
swirl control valve problem.
P1131 - Manufacturer control fuel air metering - Swirl Control
Trouble code P1138 means: Swirl Control Valve Control Performance
It's buried up under the intake manifold collector and has 2 (two) vacuum hoses and an electrical (probably lime-green) connection. The fix: remove and replace
Sounds like a swirl control solenoid problem. Its a Nissan only part and its expensive! $500-$800 job
The sooooo called "Swirl control valve" on most nissan sentra's depending on your geog.. Loc..(ca. Especially) looks quiet differently From even one year apart hince, your region of the country. None the less, the power actuator is located at the driverside intake. It is mounted with usually brass colored bracket onto the intake. Its primary function is to monitor/maintain "Air-2-fuel" stricly governed By the vehicles ecm.
to swirl is translated "tourbillonner, tourner" in French.