1. Ignition Wires (Spark Plug Wires): These are the most common culprit. Check each wire for:
* Cracks or holes: Look closely along the entire length of each wire for any damage.
* Properly seated: Ensure each end is securely connected to both the coil and the spark plug. A loose connection will prevent spark from reaching the cylinder.
* Arcing: In low-light conditions (or even in darkness), carefully look for sparks jumping between the wire and anything else (including the engine block). This indicates a high-resistance leak in the wire's insulation.
2. Spark Plugs:
* Gap: Check the gap on each spark plug with a feeler gauge. A gap that's too wide or too narrow will prevent proper spark. The correct gap should be specified in your owner's manual.
* Condition: Inspect the plugs for fouling (carbon buildup, oil, etc.), which can prevent sparking. If they're old or damaged, replace them.
3. Distributor Cap and Rotor (if applicable): The '89 Mazda 323 likely has a distributor. Inspect the cap for cracks, carbon tracking (black marks), or corrosion. The rotor should spin freely and show no signs of wear or damage. Ensure the rotor is making good contact with the cap's terminals.
4. Ignition Control Module (ICM) or Igniter: This component controls the timing and delivery of the spark. While less common, a faulty ICM can prevent sparks from reaching the plugs even if the coil is firing. This usually requires more advanced testing with a multimeter or oscilloscope.
5. Cranking System: While less likely if the coil is sparking, a weak cranking system (bad battery, alternator, starter motor) might not spin the engine fast enough to generate enough voltage for the spark to jump the gap reliably in all cylinders. Check battery voltage and starter operation.
Troubleshooting Steps:
1. Start with the simplest checks: Visually inspect the wires and spark plugs first. This is the quickest and easiest way to find a problem.
2. Use a process of elimination: Once you've checked one component, move on to the next. If you find a problem, fix it and retest the engine.
3. Consult a repair manual: A service manual specific to your '89 Mazda 323 will provide detailed diagrams and specifications to aid your diagnosis.
If you've checked all of these and still have a problem, it's time to seek professional help from a mechanic. Attempting more advanced diagnostics without proper tools and knowledge could damage your vehicle further.
