They’re often accompanied by the following symptoms: They’re the result of low operating temperatures. Long stretches of driving at low speeds.Ĭarbon deposits are soot- black and soft to the touch.Frequent bouts of short-distance driving.Fuel mixture too rich (not enough air).This type of deposit might be the result of one or more of the following: Replace your spark plugs once you’ve completed the repair. For instance, the smell of burning oil likely signals a leak.Ĭheck for engine damage afterward. Investigate potential culprits one by one, according to the symptoms you have. This heightens the risk of friction damage and jamming. The wrong ratio of fuel to air can negatively impact your fuel economy.Īn inappropriate viscosity of oil for your car translates into poor lubrication. If you push your motor too far in this state, it could fail. Engine overheating will wear out moving mechanisms faster. Running low on coolant and oil is asking for trouble. The other causes of ash deposits can be bad news for your vehicle in the long term. If you’re lucky, you have a spark plug that hasn’t been screwed in correctly – check our article on how tight spark plugs should be. The symptoms of this fault can manifest as: They’re usually an off-white color with a cinder-like consistency, like cigarette ash. You’ll find these deposits covering the electrodes and insulator tip. Ash DepositsĪsh deposits can be the result of a range of issues from minor to serious:Īppearance, Symptoms, and Trouble it May Cause This will usually be every 30,000 miles or so, but more details can be found in our guide on how often to change spark plugs. Replace normal spark plugs as per your vehicle manufacturer’s recommendations. Engine performance is normal everything is working as it should. There aren’t any symptoms or troubles to speak of here. The electrode may be mildly eroded, but nothing more severe than that. The base is threaded so it can be screwed into your cylinder head.Ī healthy unit will be gray, tan or pale brown at the nose or tip. This runs from the terminal (tip) all the way down to the firing end. Watch this brief animation to see how they work:Īppearance can vary slightly based on the type you bought, but all types are built using the same concepts.Ī porcelain shell conceals an inner electrode. The resulting spark is what ignites the fuel to run your engine. These deliver high-voltage discharges to your ignition system. We’re defining normal spark plugs as those that look and are working exactly as they should. These variables can be subjective, and we’d rather keep it objective. They’re not ranked according to severity, frequency, or any other criteria. The subsequent troubleshooting sections on spark plug fault diagnosis, are listed in alphabetical order. What follows in the article from here, is the first section telling you what spark plug’s look like when they’re normal and functional. Here’s a quick list of the common spark plug faults: 14.2 Recommendations and Actions to TakeĬommon Faults With Spark Plugs and Their Causes.14.1 Appearance, Symptoms, and Trouble it May Cause.13.2 Recommendations and Actions to Take.13.1 Appearance, Symptoms, and Trouble it May Cause.12.2 Recommendations and Actions to Take.12.1 Appearance, Symptoms, and Trouble it May Cause.11.2 Recommendations and Actions to Take.11.1 Appearance, Symptoms, and Trouble it May Cause.10.2 Recommendations and Actions to Take.10.1 Appearance, Symptoms, and Trouble it May Cause.9.2 Recommendations and Actions to Take.9.1 Appearance, Symptoms, and Trouble it May Cause.8.2 Recommendations and Actions to Take.8.1 Appearance, Symptoms, and Trouble it May Cause.7.2 Recommendations and Actions to Take.7.1 Appearance, Symptoms, and Trouble it May Cause.6.2 Recommendations and Actions to Take.6.1 Appearance, Symptoms, and Trouble it May Cause.5.2 Recommendations and Actions to Take.5.1 Appearance, Symptoms, and Trouble it May Cause.4.2 Recommendations and Actions to Take.4.1 Appearance, Symptoms, and Trouble it May Cause.3.2 Recommendations and Actions to Take.3.1 Appearance, Symptoms, and Trouble it May Cause.2.2 Recommendations and Actions to Take.1 Common Faults With Spark Plugs and Their Causes.
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