1. Ignition System:
* Spark Plugs and Wires: Worn or fouled spark plugs and cracked or damaged wires can cause intermittent starting problems. Check for gaps, corrosion, and wear.
* Distributor Cap and Rotor: Cracks, wear, or corrosion in the distributor cap and rotor can lead to a weak or inconsistent spark. Inspect for damage and ensure they're clean.
* Ignition Coil: A failing ignition coil can't deliver enough voltage to create a strong spark. Test the coil with a multimeter to ensure it's working properly.
2. Fuel Delivery:
* Fuel Pump: A weak or failing fuel pump may not provide enough pressure to the injectors. Listen for the pump to hum when you turn the key to the "on" position. If it's weak or silent, consider replacement.
* Fuel Filter: A clogged fuel filter can restrict fuel flow, causing starting problems. It's recommended to replace the filter regularly, even if it's not showing obvious signs of clogging.
* Fuel Injectors: Clogged or malfunctioning fuel injectors can prevent fuel from reaching the cylinders. You may need to have them cleaned or replaced.
3. Sensor Issues:
* Crankshaft Position Sensor (CPS): This sensor tells the ECU when the engine is turning. A faulty CPS can prevent the ignition system from firing correctly, resulting in no spark.
* Cam Position Sensor (CMP): This sensor monitors the camshaft's position. A malfunctioning CMP can lead to incorrect timing, causing starting issues.
4. Engine Management System:
* ECU (Engine Control Unit): A faulty ECU can prevent the engine from starting due to incorrect programming or sensor readings. This is less common but possible.
5. Other Possibilities:
* Battery: While you mention it's cranking, a weak battery can still cause starting problems. Make sure the battery terminals are clean and secure.
* Starter: A failing starter can cause the engine to crank slowly or not at all.
* Vacuum Leaks: Large leaks in the intake manifold or vacuum lines can affect the air/fuel mixture, making starting difficult.
Troubleshooting Tips:
* Start with the basics: Ensure you have a full tank of gas, check your battery terminals, and look for any loose connections.
* Diagnostic Codes: Connect a code reader to your MX-6 to see if any fault codes are stored in the ECU. This can provide valuable clues.
* Visual Inspection: Look for any signs of damage, wear, or corrosion in the ignition system, fuel lines, and sensors.
* Test with a Multimeter: Use a multimeter to test the ignition coil, fuel pump, and other components.
Important Note: Troubleshooting can be complex. If you're not comfortable working on your car, take it to a trusted mechanic for diagnosis and repair.
