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.
1978 Mazda Cosmo Automatic TransFACTORY OEM SERVICE PROCEDURE
1976-77 California Models
- Connect tachometer and timing light to leading spark plug wire. Disconnect water temperature switch and connect a jumper wire to both connector terminals. See Figure. Start engine and set engine speed at 2000 RPM with choke knob.
- Observe timing marks on shaft pulley. Timing indicator should point between Yellow (leading) and Red (trailing) ignition timing marks. Timing should quickly advance past Yellow mark 104-156 seconds after engine is started.
- Connect voltmeter to positive terminal of leading ignition coil. Slowly increase engine speed to 3600-4400 RPM. Voltage should increase by 1-2 volts.
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.