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.
1987 Mazda RX-7 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Double Throttle Diaphragm
- Disconnect vacuum relief solenoid valve tube from front of double throttle diaphragm. Apply vacuum of more than 7.8 in. Hg to the double throttle diaphragm.
- Make sure that the No. 2 secondary throttle valve is fully closed. Check the calibration of the double throttle diaphragm. It should start to open at 4.7 in. Hg and be fully open at 0-1.8 in. Hg. See Fig 1 .
- Disconnect vacuum hose from rear of double throttle diaphragm. Replace vacuum hose to front of double throttle diaphragm. Apply 18.1 in. Hg vacuum to rear of double throttle diaphragm. Check clearance between No. 2 secondary throttle valve and wall of throttle chamber. Clearance should be .08-.12" (2.2-3.2 mm).
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.