Intake Manifold Tuning (IMT) Function, Checking

Intake Manifold Tuning (IMT) Function, Checking


NOTE: The following test should only be conducted if performance deficiencies occur.


- Increase engine rpm clearly above 4500 RPM.

Intake manifold tuning vacuum solenoid must be actuated (solenoid is located on intake manifold, left-front, under the ignition coils).

If the vacuum solenoid is not actuated:
- Check intake manifold tuning valve -N156- (change-over valve). Testing and Inspection
- Check vacuum system for leaks. Refer to "Vacuum System, Checking For Leaks" Testing and Inspection
- Check that vacuum lines are correctly installed, do not leak and are not blocked.
- Check change-over mechanism for ease of movement (activate change-over linkage by hand).