Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA1991RX-7 BASE, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMDELAY VALVE (NON-TURBO)
1991 Mazda RX-7 Base, 2D Convertible, Standard
Delay Valve (Non-Turbo)
1991 Mazda RX-7 Base, 2D Convertible, StandardSECTION Delay Valve (Non-Turbo)
- Disconnect vacuum delay valve. Connect 3.28 ft. vacuum tube and delay valve to vacuum pump. Ensure valve is installed with arrow pointing from vacuum tester. See Fig 1 .
- Block remaining side of valve with finger. Using vacuum pump, apply at least 19.7 in. Hg to valve. Remove finger. Note time required for vacuum reading to fall from 15.7 in. Hg to 3.9 in. Hg on each valve. Delay valve vacuum decrease time must be within specification. See DELAY VALVE VACUUM SPECIFICATIONS (NON-TURBO) table.
DELAY VALVE VACUUM SPECIFICATIONS (NON-TURBO)
| Application | Seconds | |
|---|---|---|
| Automatic Transmission | ||
| Valve "A" | 1.1 | |
| Valve "B" | 0.4 | |
| Manual Transmission | 9-15 | |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.