Here is the definition. Cost would depend on your area and the actual problem found after testing.
P1800 NISSAN Description
When the engine is running at low or medium speed, the power valve is
fully closed. Under this condition, the effective suction port length
is equivalent to the total length of the intake manifold collector's
suction port including the intake valve. This long suction port provides
increased air intake which results in improved suction efficiency and
higher torque generation.
The surge tank and one-way valve are provided. When engine is running at high speed, the Engine Control Module (
ECM)
sends the signal to the Variable Intake Air System (VIAS) control
solenoid valve. This signal introduces the intake manifold vacuum into
the power valve actuator and therefore opens the power valve to two
suction passages together in the collector.
Under this
condition, the effective port length is equivalent to the length of the
suction port provided independently for each cylinder. This shortened
port length results in enhanced engine output with reduced suction
resistance under high speeds.
Read more:
http://engine-codes.com/p1800_nissan.html#ixzz2JgphPIVM
×