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.
1991 Mazda 626 DX, AutomaticFACTORY OEM SERVICE PROCEDURE
Spark (RX7)
- Crank engine. Using a spark tester (or by holding wire 5/16" from ground), check for a strong Blue spark at coil wire and at each spark plug wire. Check spark plug wire resistance on suspect wires.
- Using ohmmeter, check resistance of high tension leads. Resistance should be 4878 ohms per foot. Disconnect and inspect all related ignition system connectors and harnesses. Clean or repair as necessary and recheck spark. If connectors and harnesses are okay, go to LEADING SIDE IGNITOR (RX7).
CAUTION:
During testing procedure, ensure high tension leads remain connected to coil. Disconnecting of high tension leads may cause high voltage sparks. Ensure battery is fully charged.
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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