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.
1989 Mazda RX-7 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Delay Valve
- On A/T models, note installation location of delay valves. On all models, disconnect vacuum delay valve. Connect approximately 3.28 ft. of vacuum tube and delay valve to vacuum pump. Ensure valve is installed with arrow away from vacuum tester. See Fig 1 .
- Block remaining side of valve with your finger. Using vacuum pump, apply at least 19.7 in. Hg to valve. Remove your 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 table.
NOTE:
On A/T models, delay valve identification or installation location must be used to determine proper vacuum delay time. See Figure
.
DELAY VALVE VACUUM SPECIFICATIONS
| Application | Seconds | |
|---|---|---|
| Auto. Trans. | ||
| Valve "A" | 1.1 | |
| Valve "B" | .4 | |
| Man. Trans. | 9-15 | |
Factory Service Tools
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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.
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