Ford F150 Pickup. Instruction — part 1619

solenoid is de-energized to allow vacuum to vent from actuator and butterfly valve plates will open.

Fig. 7: View Of Intake Manifold Swirl Control Valve System
Courtesy of FORD MOTOR CO.

Fig. 8: Identifying Intake Manifold Swirl Control Valve System - Ranger 2.3L (VIN D)
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Theory & Operation - CNG, Flex-Fuel & Gasoline

Intake Manifold Tuning Valve - LS, Sable & Taurus 3.0L (VIN S), Econoline & Pickup 4.6L (VIN W), & Blackwood
5.4L 4V (VIN A)

Intake Manifold Tuning Valve (IMTV) is an electric actuator mounted directly to intake manifold. IMTV
operates a shutter device attached to electric actuator shaft. When electric actuator is energized, it rotates shaft
and opens shutter, allowing both sides of the manifold airflow to blend together. See Fig. 9 -Fig. 12 .

There is no monitor feedback to PCM from IMTV to indicate shutter position (open or closed). PCM uses a
positive change in throttle position sensor along with the increase in engine RPM from crankshaft position
sensor to open shutter.

When engine speed is below 2600 RPM, electric actuator will not be energized, allowing IMTV shutter to
remain in closed position (no airflow blend occurs). When engine speed is 2600 RPM or more, electric actuator
is initially energized at a 100 percent duty cycle, causing shutter to open position (airflow blend occurs). Duty
cycle then falls to about 50 percent duty cycle to continue to hold shutter open.

Fig. 9: View Of Intake Manifold Tuning Valve System
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Theory & Operation - CNG, Flex-Fuel & Gasoline

Fig. 10: Identifying Intake Manifold Tuning Valve System - Blackwood 5.4L 4V (VIN A)
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Theory & Operation - CNG, Flex-Fuel & Gasoline

Fig. 11: Identifying Intake Manifold Tuning Valve System - Econoline & Pickup 4.6L (VIN W)
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Theory & Operation - CNG, Flex-Fuel & Gasoline