Here are some possibilities:
* Ignition System Failure: The loud backfire suggests a misfire that could have damaged components in your ignition system. This could include:
* Distributor Cap and Rotor: These are common points of failure and can cause misfires and backfires. Cracks or burnt contacts are likely culprits.
* Ignition Coil: A failing coil can't provide sufficient voltage to the spark plugs, leading to misfires and potential damage.
* Spark Plugs and Wires: Worn or damaged spark plugs or wires can cause misfires and backfires.
* Ignition Module (or Electronic Control Module - ECM): These control the ignition timing and could be faulty.
* Exhaust System Restriction: A severe restriction in your exhaust system (like a completely blocked catalytic converter) could build up pressure that causes the backfire. The backfire itself might have further damaged the exhaust.
* Internal Engine Damage: The most serious possibility is internal engine damage. The backfire could indicate a problem with:
* Broken connecting rod: This is a catastrophic failure that would prevent the engine from turning over.
* Valve damage: A backfire can bend or break valves, causing the engine to seize.
* Piston damage: Similar to valve damage, a backfire could damage pistons.
* Starter Motor Issues (less likely given the backfire): While less likely given the preceding events, a faulty starter motor could also prevent the engine from cranking. However, this is usually accompanied by a clicking sound.
What to do:
1. Safety First: Do not attempt to start the car again. The backfire and smoke indicate a problem that could cause further damage.
2. Inspect Visually: Check for obvious signs of damage:
* Look for broken or loose wires around the ignition system, especially near the distributor.
* Examine the exhaust system for blockages or damage.
* Look for any signs of leaks around the engine.
3. Check for Spark: If you're comfortable working on cars, check if the spark plugs are sparking. Use a spark plug tester or carefully observe the spark while someone cranks the engine (with the appropriate safety precautions).
4. Professional Help: Given the severity of the symptoms (loud backfire, smoke, and no cranking), it's strongly recommended to have a qualified mechanic diagnose and repair the problem. Trying to fix this yourself without experience could lead to further damage and potentially costly repairs.
The backfire and smoke suggest something serious is wrong. Ignoring it could lead to significant and expensive engine damage. Get it checked by a professional as soon as possible.
