Intake Manifold Tuning

CMFI Air Flow Diagram:

Intake Manifold Tuning Valve Circuit:

LH Front Side Of Engine:

PURPOSE
The tuning valve (rotary solenoid device) is electrically controlled by the ECM based on RPM and TP signal inputs, for accurate switching capability at optimum switching points to enable either a "split" or "single" plenum condition

OPERATION
During the low and high end of the RPM range, the ECM de-energize 5 the valve and creates a "split" plenum condition that provides for peak torque along with increased peak horsepower.
During the mid RPM range, the ECM energizes the valve, thus creating a "single" tuning plenum condition that provides for mid RPM range peak torque.

CONSTRUCTION
The Intake Manifold Tuning assembly consists of:
- ECM
- Intake Manifold Tuning Valve Relay
- Intake Manifold Tuning Valve Solenoid (Assembly)
- Upper and Lower Intake Manifolds