System Check (MX-6 & 626 2.5L)
WARNING: This page is about a different car, the 1995 Mazda MX-6 and 1995 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
Connect tachometer to engine. Start engine, and operate at idle. Manually open throttle valve. Ensure shutter valves No. 1 and 2 operate as specified. See VRIS RPM SPECIFICATIONS table. See Fig 1 . If necessary, check Variable Resonance Induction System (VRIS) components.
VRIS RPM SPECIFICATIONS (MX-6 & 626)
| RPM | Position | |
|---|---|---|
| Shutter Valve No. 1 | ||
| Less Than 3250 | Closed | |
| 3250-4250 | Open | |
| 4250-6250 | Open | |
| Greater Than 6250 | Closed | |
| Shutter Valve No. 2 | ||
| Less Than 3250 | Closed | |
| 3250-4250 | Closed | |
| 4250-6250 | Open | |
| Greater Than 6250 | Closed | |