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Trang Hà Tây 96
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Tuesday 20 October 2026 04:07:02 GMT
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A spark plug works inside the combustion chamber, so its appearance can reveal useful clues about engine conditions. This chart shows common patterns—but a photo is a starting point for diagnosis, not a final verdict.    ⚫ Carbon fouling  Dry, black deposits can accompany an overly rich mixture, repeated short trips or a plug that is too cold for the application. Check the vehicle's symptoms and specifications before blaming one component.    💧 Wet or oily deposits  A wet plug may carry fuel, oil or coolant. Those fluids point toward different problems, so first identify what is actually on the plug. Oil fouling can suggest oil entering the cylinder; fuel wetting can follow unsuccessful ignition or repeated starting attempts.    🔥 Overheating and pre-ignition  An unusually pale, blistered or damaged firing end deserves attention. Excessive heat, an unsuitable plug specification or abnormal combustion may be involved. Pre-ignition and detonation are different combustion problems; they are not interchangeable names for every damaged electrode.    🧱 Ash, glazing and a bridged gap  Deposits can build up on the insulator and electrodes. A deposit bridging the gap can interfere with the spark. The color and texture help guide the investigation, but they do not identify a single cause on their own.    📏 Wear and mechanical damage  Rounded electrodes and an enlarged gap can indicate wear. A bent or broken firing end needs closer investigation: verify the plug's reach and application, and consider whether something has contacted it inside the cylinder.    🔧 Inspect the whole set  Keep track of which cylinder each plug came from. One unusual plug may suggest a cylinder-specific issue; a similar pattern across the set can point toward a shared condition. Compare the findings with fault codes, service history and further tests.    ✅ Replace with the specified type, heat range and gap. Install using the manufacturer's procedure and torque. Changing heat range to hide deposits can create a new problem.    Do not assume every healthy plug must look exactly like the “normal” example. Operating conditions and plug designs affect appearance.    Save this guide for your next service. Which condition have you seen most often?    #SparkPlugs #EngineDiagnosis #CarMaintenance #AutoTips #MechanicTips
A spark plug works inside the combustion chamber, so its appearance can reveal useful clues about engine conditions. This chart shows common patterns—but a photo is a starting point for diagnosis, not a final verdict. ⚫ Carbon fouling Dry, black deposits can accompany an overly rich mixture, repeated short trips or a plug that is too cold for the application. Check the vehicle's symptoms and specifications before blaming one component. 💧 Wet or oily deposits A wet plug may carry fuel, oil or coolant. Those fluids point toward different problems, so first identify what is actually on the plug. Oil fouling can suggest oil entering the cylinder; fuel wetting can follow unsuccessful ignition or repeated starting attempts. 🔥 Overheating and pre-ignition An unusually pale, blistered or damaged firing end deserves attention. Excessive heat, an unsuitable plug specification or abnormal combustion may be involved. Pre-ignition and detonation are different combustion problems; they are not interchangeable names for every damaged electrode. 🧱 Ash, glazing and a bridged gap Deposits can build up on the insulator and electrodes. A deposit bridging the gap can interfere with the spark. The color and texture help guide the investigation, but they do not identify a single cause on their own. 📏 Wear and mechanical damage Rounded electrodes and an enlarged gap can indicate wear. A bent or broken firing end needs closer investigation: verify the plug's reach and application, and consider whether something has contacted it inside the cylinder. 🔧 Inspect the whole set Keep track of which cylinder each plug came from. One unusual plug may suggest a cylinder-specific issue; a similar pattern across the set can point toward a shared condition. Compare the findings with fault codes, service history and further tests. ✅ Replace with the specified type, heat range and gap. Install using the manufacturer's procedure and torque. Changing heat range to hide deposits can create a new problem. Do not assume every healthy plug must look exactly like the “normal” example. Operating conditions and plug designs affect appearance. Save this guide for your next service. Which condition have you seen most often? #SparkPlugs #EngineDiagnosis #CarMaintenance #AutoTips #MechanicTips

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