Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
Description and Operation 1-83
Intake Air Systems
(Continued)
Intake Air System | Component |
|---|---|
10 | EVAP Canister |
11 | EVAP Purge Valve |
12 | Positive Crankcase Ventilation (PCV) |
13 | Intake Air Resonator |
Throttle Body System Overview
The throttle body system meters air to the engine during idle, part throttle, and wide open throttle (WOT) conditions. The throttle body system consists of single or dual bores with butterfly valve throttle plates and a throttle position (TP) sensor. The airflow is measured by the MAF sensor.
The major components of the throttle body assembly include the TP sensor and the throttle body housing assembly. For additional information on the intake air system components, refer to Engine Control Components in this section.
Features Of The Throttle Body Assembly Include:
1. A preset stop to locate the WOT position.
2. A throttle body mounted TP sensor.
3. A coating sealant on the throttle bore and throttle plate makes the throttle body airflow tolerant to engine intake sludge accumulation. Some vehicles have a decal advising not to clean.
4. A non adjustable stop screw for close plate idle airflow.
Intake Manifold Runner Control (IMRC) And Intake Manifold Tuning Valve (IMTV)
WARNING: Substantial opening and closing torque is applied by this system. To prevent injury, be careful to keep fingers away from lever mechanisms when actuated. Failure to follow these instructions may result in personal injury.
There are 2 basic types of intake air subsystems:
• IMRC
• IMTV
There are several different styles of hardware used to control airflow within the engine air intake system. In general, the devices are defined based on whether they control charge motion or manifold tuning.
The IMRC modifies the air charge motion in the intake manifold. The IMRC is located at the rear of the intake manifold. The IMRC system must have a monitor feedback system in order to meet OBD II regulations.
The IMTV modifies the airflow volume of the manifold by connecting multiple plenums or inlets within the intake manifold. The IMTV control valve is located in the center of the intake manifold. The IMTV system does not have to be monitored for OBD II regulations.
These subsystems provide increased intake airflow to improve torque, emissions and performance. The overall volume of air metered to the engine is controlled by the throttle body.
Intake Manifold Runner Control (IMRC) System
WARNING: Substantial opening and closing torque is applied by this system. To prevent injury, be careful to keep fingers away from lever mechanisms when actuated. Failure to follow these instructions may result in personal injury.
The IMRC system consists of a manifold mounted vacuum actuator and a PCM controlled electric solenoid. For additional information on IMRC vacuum actuated components, refer to Engine Control Components in this section. The linkage from the actuator attaches to the manifold plate lever. The IMRC vacuum actuator and manifold has a single intake air passage for each cylinder. The passage has a valve plate that blocks a large percentage of the opening when actuated, leaving the top of the passage open to generate turbulence. The housing uses a return spring to hold the valve plates open. The IMRC sensors provide feedback to the PCM indicating the valve plate position.
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.