1. Does the engine crank (turn over)?
* Yes: If the engine cranks but doesn't start, the problem lies in the ignition system or fuel delivery. Possible causes include:
* Dead battery: Test the battery voltage. Should be around 12.6 volts when not cranking.
* Faulty starter: Although it's cranking, a weak starter might not provide enough power.
* Fuel pump problem: Check if you hear the fuel pump prime when you turn the key to the "on" position (but not cranking). A lack of fuel pressure is a common culprit.
* Clogged fuel filter: Restricts fuel flow.
* Bad fuel injectors: Injectors might be clogged or failing.
* Ignition coil or distributor problems: (If equipped with a distributor) These components are crucial for ignition. Check for spark at the spark plugs.
* Crankshaft Position Sensor (CKP): This sensor tells the computer the engine's position, and a faulty one prevents starting.
* Cam Position Sensor (CMP): Similar to the CKP, this sensor is vital for timing.
* Mass Airflow Sensor (MAF): A faulty MAF sensor can affect the air/fuel mixture.
* Security system issues: If equipped with a security system, it might be preventing the engine from starting.
* No: If the engine doesn't even crank, the problem is likely in the starting system. Possible causes include:
* Dead battery: Check voltage as mentioned above.
* Faulty battery cables: Corrosion or loose connections can prevent current flow.
* Faulty starter: It might be failing to engage or is completely dead.
* Faulty ignition switch: This switch controls power to the starter.
* Neutral safety switch (automatic transmission): Prevents starting unless the transmission is in Park or Neutral.
2. What sounds do you hear when you try to start it?
* Clicking sound: This often indicates a low battery or a faulty starter.
* Nothing: Could be a dead battery, faulty ignition switch, or a problem with the starter circuit.
* Grinding sound: This usually means the starter is engaging improperly.
3. Any warning lights on the dashboard?
Note any lights that are illuminated, especially the check engine light. A code reader can help decipher the meaning of these lights.
To help me diagnose the problem further, please tell me:
* Does the engine crank?
* What sounds do you hear when you turn the key?
* Are there any warning lights on the dashboard?
* Have you recently performed any maintenance or repairs on the car?
Once I have this information, I can offer more specific advice. If you're not comfortable working on the car yourself, take it to a qualified mechanic for diagnosis and repair.
