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You were driving heard a pop and air then the engine stopped now it turns over but wont start?

You're describing a classic symptom of a blown head gasket. Here's why and what to do:

What likely happened:

* Blown Head Gasket: The head gasket seals the combustion chamber from the cooling system. When it blows, it can cause a few things:

* Loss of Coolant: The coolant leaks into the combustion chamber, potentially causing the engine to overheat.

* Air in the Cooling System: Air from the combustion chamber can enter the cooling system, making it harder to maintain pressure and potentially causing overheating.

* Engine Misfire: The air-fuel mixture in the combustion chamber is compromised, leading to a misfire and eventually a stall.

Why the engine turns over but won't start:

* Lack of Compression: The blown head gasket allows air to escape from the cylinders, preventing proper compression and ignition.

What to do:

1. Safety First:

* Don't try to restart the engine. This could cause further damage.

* Check the coolant level. If it's low, you likely have a leak.

* Look for signs of overheating. If the engine is hot, let it cool down completely before inspecting.

2. Inspect for External Damage:

* Check for coolant leaks around the engine and under the car.

* Look for any obvious damage to hoses or belts.

3. Get it Diagnosed:

* Call a tow truck. It's best to have a mechanic diagnose and repair the issue, as a blown head gasket is a serious repair.

* Explain the symptoms to the mechanic so they can start troubleshooting effectively.

Important Notes:

* Don't ignore the problem. Driving with a blown head gasket can cause severe engine damage.

* Early detection is key. If you hear a popping sound or notice any of the symptoms described above, pull over and get it checked out immediately.

Let me know if you have any other questions!