what is this part?
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Senior User
Joined: Nov 2004
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From: Jacksonville, NC
what is this part?
what part is this and what does it do? the problem is the little black clip at the bottom keeps popping off. want to know ho to fix if possible? thanks for any help. 98 explorer 4.0 SOHC 2wd.
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Looks to me like a vacuum-actuated IMRC system:
Intake Manifold Runner Control (IMRC) Vacuum Actuated System
The Intake Manifold Runner Control (IMRC) Vacuum Actuated System consists of a vacuum control solenoid, a Vacuum-Actuator and a housing assembly on each bank. The vacuum control solenoid allows manifold vacuum to pass through when in the energized state. The vacuum actuators control butterfly plate position on the housing in response to the vacuum signal supplied by the vacuum control solenoid. They also provide feedback to the PCM indicating butterfly plate position. The actuator diaphragms have attaching rods along with a clip to fasten the rods to the butterfly plate levers. Each IMRC housing is an aluminum casting with two intake air passages for each cylinder. One passage is always open and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold the butterfly valve plates closed.
Below approximately 3000 rpm, the vacuum control solenoid will be energized. This will allow manifold vacuum through the vacuum control solenoid to the vacuum actuators to hold the butterfly valve plates closed. Without manifold vacuum, the butterfly plates will remain open due to the force of the vacuum actuators being attached to the runner shaft. Above approximately 3000 rpm, the vacuum control solenoid will not be energized. This will block manifold vacuum and vent the vacuum actuators allowing the runners into the open position.
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.
The PCM uses the TP sensor and CKP signals to determine activation of the IMRC system. There must be a positive change in voltage from the TP sensor along with the increase in rpm to open the valve plates.
The PCM uses the information from the input signals to control the IMRC vacuum control solenoid.
The PCM deenergizes a vacuum control solenoid blocking manifold vacuum and providing a vent to atmosphere for the vacuum actuators which then force the butterfly plates open.
The IMRC housing contains butterfly plates to allow increased air flow.
The Intake Manifold Runner Control (IMRC) Vacuum Actuated System consists of a vacuum control solenoid, a Vacuum-Actuator and a housing assembly on each bank. The vacuum control solenoid allows manifold vacuum to pass through when in the energized state. The vacuum actuators control butterfly plate position on the housing in response to the vacuum signal supplied by the vacuum control solenoid. They also provide feedback to the PCM indicating butterfly plate position. The actuator diaphragms have attaching rods along with a clip to fasten the rods to the butterfly plate levers. Each IMRC housing is an aluminum casting with two intake air passages for each cylinder. One passage is always open and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold the butterfly valve plates closed.
Below approximately 3000 rpm, the vacuum control solenoid will be energized. This will allow manifold vacuum through the vacuum control solenoid to the vacuum actuators to hold the butterfly valve plates closed. Without manifold vacuum, the butterfly plates will remain open due to the force of the vacuum actuators being attached to the runner shaft. Above approximately 3000 rpm, the vacuum control solenoid will not be energized. This will block manifold vacuum and vent the vacuum actuators allowing the runners into the open position.
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.
The PCM uses the TP sensor and CKP signals to determine activation of the IMRC system. There must be a positive change in voltage from the TP sensor along with the increase in rpm to open the valve plates.
The PCM uses the information from the input signals to control the IMRC vacuum control solenoid.
The PCM deenergizes a vacuum control solenoid blocking manifold vacuum and providing a vent to atmosphere for the vacuum actuators which then force the butterfly plates open.
The IMRC housing contains butterfly plates to allow increased air flow.
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Originally Posted by bulldog3531
Thanks Rockledge. I posted in this forum as well as the explorer forum. To see where I would get a answer. How can I keep the rod and clip from popping off?
How is it held on there?
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Senior User
Joined: Nov 2004
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From: Jacksonville, NC
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Senior User
Joined: Nov 2004
Posts: 279
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From: Jacksonville, NC
I contacted my ford dealership the actual term they use is Variable Intake System Mortor but it is as what Rockledge says it is and does. The part cost $45.75.
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