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: Common Faults With Spark Plugs and Their Causes We’ll also warn you about the consequences of each fault if you don’t address it and allow them to get worse. This includes descriptions of symptoms and suggested actions to take. You’ll learn about 11 of the most common complications they suffer from. You don’t have to take the whole engine apart to find your spark plugs, making the inspection and the use of them for diagnosing many car troubles simple.īelow, we’ve compiled a user-friendly spark plug diagnosis guide. Spark plugs usually fall into the first category, and that’s what this article is going to discuss: Using spark plug diagnosis to look for possible issues with your engine. For almost any problem with a crucial car part or system, there are going to be recognizable symptoms.įollowing on from this, the condition of specific car parts can be a good indicator of parts of your engine’s health.Ĭertain components in vehicles are easy to troubleshoot.
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