Intake Manifold Runner Control (IMRC) System

Intake Manifold Runner Control (IMRC) System




Description
Satisfactory power performance is achieved by closing and opening the intake manifold runner control (IMRC) valves.
High torque at low RPM is achieved when the valves are closed, whereas high power at high RPM is achieved when the valves are opened.

Troubleshooting Flowchart (Part 1):

Troubleshooting Flowchart (Part 2):

Troubleshooting Flowchart (Part 3):

Troubleshooting Flowchart (Part 4):

Troubleshooting Flowchart

Intake Manifold Runner Control (IMRC) Valve 1 Testing




1. Disconnect the No.2 hose from the vacuum hose manifold, and attach a vacuum pump to the vacuum hose manifold.
2. Apply vacuum and verify that the IMRC diaphragm holds vacuum and that as the vacuum is applied and released the IMRC diaphragm rod moves in and out.

If the IMRC diaphragm does not hold vacuum or the IMRC diaphragm rod does not move in and out, replace the IMRC diaphragm and retest.

Intake Manifold Runner Control (IMRC) Valve 2 Testing




1. Disconnect the No.8 hose from the vacuum hose manifold, and attach a vacuum pump to the vacuum hose manifold.
2. Apply vacuum and verify that the IMRC diaphragm holds vacuum and that as the vacuum is applied and released the IMRC diaphragm rod moves in and out.

If the IMRC diaphragm does not hold vacuum or the IMRC diaphragm rod does not move in and out, replace the IMRC diaphragm and retest.