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Why Your Car Smells Like Gas
If your car smells like gas (petrol), it’s usually a sign of a problem that should be addressed quickly. Here are the most common reasons:

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🔧 1. Fuel Leak
• Cause: Damaged fuel line, injector seal, or fuel tank.
• Sign: Strong gas smell inside or outside the car, especially after driving or parking.
• Fix: Mechanic should inspect the entire fuel system.

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⛽ 2. Loose or Damaged Fuel Cap
• Cause: Cap not tightened properly or seal is worn.
• Sign: Smell around the fuel door; check engine light may come on.
• Fix: Replace or tighten the cap properly.

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🔥 3. Fuel Injector Leak
• Cause: Worn O-rings or cracked injectors.
• Sign: Smell while driving, poor fuel economy, rough idle.
• Fix: Replace faulty injector or seals.

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🛞 4. EVAP System Issue
• Cause: Faulty charcoal canister, valve, or hoses in the EVAP (evaporative emissions) system.
• Sign: Smell mainly near rear of car or during hot weather.
• Fix: Diagnose and repair EVAP components.

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🚗 5. Engine Misfire or Running Rich
• Cause: Too much fuel in the air-fuel mixture.
• Sign: Smell from exhaust, black smoke, rough running.
• Fix: Check spark plugs, sensors (O2, MAF), or fuel pressure regulator.

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⚠️ Important Note:

Never ignore a gas smell—it could lead to fire risk or carbon monoxide exposure. Get it checked by a mechanic immediately.

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Here are some common throttle body issues found in modern vehicles, especially those with electronic throttle control:

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🚗 1. Carbon Build-Up

Description: Over time, carbon deposits from the air-fuel mixture can accumulate inside the throttle body, especially around the throttle plate.

Symptoms:
• Rough idling
• Hesitation or stalling
• Poor fuel economy

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⚡️ 2. Throttle Position Sensor (TPS) Failure

Description: The TPS monitors the position of the throttle plate and sends data to the engine control unit (ECU). If it fails, the ECU receives incorrect readings.

Symptoms:
• Check engine light
• Sudden power loss
• Irregular or high idle

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⚙️ 3. Electronic Throttle Control Malfunction

Description: In drive-by-wire systems, the throttle is controlled electronically. Any sensor or motor failure in this system can cause issues.

Symptoms:
• “Limp mode” activation
• Inconsistent acceleration
• Warning lights (ETC or check engine)

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🌬️ 4. Vacuum Leaks

Description: A vacuum leak near the throttle body or intake manifold affects air/fuel mixture.

Symptoms:
• High idle
• Poor acceleration
• Misfiring

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🧊 5. Sticking Throttle Plate

Description: Caused by grime or a damaged mechanism, leading to the throttle not closing or opening properly.

Symptoms:
• Delayed throttle response
• Engine surging
• Hard starts

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🔌 6. Electrical Connector Problems

Description: Corroded or loose connections to the throttle body or sensors can cause intermittent faults.

Symptoms:
• Unpredictable throttle response
• Trouble codes related to TPS or ETC
• Intermittent stalling

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🔧 7. Calibration or Software Issues

Description: After replacing or cleaning the throttle body, it may need to be recalibrated using a scan tool.

Symptoms:
• Fluctuating idle
• No throttle response after servicing
• Poor drivability

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🛠️ Maintenance Tip:

Regularly clean the throttle body every 40,000–60,000 km (or per manufacturer guidelines) and inspect for sensor faults.
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