* Fuel System Issues:
* Empty or Low Fuel: The most obvious, but always worth checking.
* Fuel Pump Failure: The pump might not be delivering fuel to the engine. Listen for the whirring sound of the fuel pump when you turn the key to the "on" position (before cranking). A weak or absent sound suggests a problem.
* Clogged Fuel Filter: A blocked filter restricts fuel flow.
* Fuel Injector Problems: Injectors might be clogged, faulty, or not receiving the correct signal.
* Fuel Pressure Regulator Issues: This regulates fuel pressure; a malfunction can lead to insufficient pressure.
* Ignition System Problems:
* Spark Plug Issues: Worn, fouled, or damaged spark plugs prevent ignition.
* Ignition Coil Failure: The coil provides the high voltage needed for the spark plugs. A faulty coil results in no spark.
* Ignition Wires (Distributor Cap & Rotor): Cracked or corroded wires or a worn distributor cap and rotor can disrupt the spark delivery. This is more likely on a car with a distributor, which the 929 likely has.
* Crankshaft Position Sensor (CKP) or Cam Position Sensor (CMP): These sensors tell the computer the engine's rotational position; a faulty sensor prevents proper ignition timing.
* Ignition Control Module (ICM): This controls the ignition system; a faulty ICM can prevent sparking.
* Other Potential Problems:
* Battery Issues (Though Less Likely): While the car cranks, a weak battery might not provide enough power to consistently run the ignition system. Test the battery voltage.
* Security System Issues (Immobilizer): Some cars have anti-theft systems that can prevent starting if the key isn't recognized.
* Engine Sensors: Various other sensors (like the oxygen sensor or mass airflow sensor) can impact the engine's ability to run, but these are less likely to completely prevent starting.
Troubleshooting Steps:
1. Check the obvious: Fuel level, battery voltage.
2. Listen for the fuel pump: Does it prime when you turn the key to the "on" position?
3. Check spark: Have someone crank the engine while you check for spark at the spark plugs (use caution – high voltage!). A spark tester can help.
4. Inspect the distributor (if applicable): Check the cap and rotor for wear or damage.
5. Check the ignition coil: A visual inspection might reveal cracks or damage.
6. Consider a diagnostic scan: A mechanic with a scan tool can read trouble codes from the car's computer, which can pinpoint the problem more precisely.
Without more specific symptoms (e.g., sounds from the engine, smells, warning lights), it's difficult to pinpoint the exact cause. It's strongly recommended to seek help from a qualified mechanic, especially considering the age of the vehicle. They have the tools and expertise to diagnose and fix the issue safely and efficiently.
