{"product_id":"lisle-in-line-spark-tester-20580-7-extension-for-coil-on-plug-live-engine-testing","title":"Lisle in-line spark tester 20580 — 7\" extension for coil-on-plug, live engine testing","description":"\u003cstrong\u003eLisle 20580 is a handheld in-line ignition tester that lets you safely observe a live spark between the plug and wire, with a 7\" extension for recessed coil-on-plug applications.\u003c\/strong\u003e\n\nThe Lisle 20580 in-line spark tester is a compact diagnostic tool designed to help mechanics and DIYers verify ignition activity without removing the plug or disabling the engine. It connects between the spark plug and its high-tension lead, producing a visible mirror-image flash while the engine runs so you can detect misfires, weak sparks, or intermittent ignition problems quickly and without complex equipment.\n\n\u003ch3\u003eHow does this tool show whether an ignition circuit is working?\u003c\/h3\u003e\n\u003cp\u003eThe tester sits inline between the plug and wire and creates a visible spark path that mirrors the ignition system’s output. With the engine running, you watch the tester’s spark to confirm firing regularity, intensity, and timing behavior.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProduces a visible flash that corresponds to the plug’s firing\u003c\/li\u003e\n  \u003cli\u003eLets you observe spark strength and consistency while idling or revving\u003c\/li\u003e\n  \u003cli\u003eWorks on conventional and modern ignition systems without complicated setup\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan it reach recessed coil-on-plug spark plugs and tight spaces?\u003c\/h3\u003e\n\u003cp\u003eYes — the unit includes a 7\" extension wire specifically for coil-on-plug or recessed installations. The short main lead has both a straight and a 90° boot to adapt to different plug orientations for secure connections in cramped engine bays.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e7-inch extension plugs into recessed or hard-to-reach coil locations\u003c\/li\u003e\n  \u003cli\u003eDouble-ended short wire offers straight and 90° boot options for fit\u003c\/li\u003e\n  \u003cli\u003eFlexible leads allow access around manifolds and other obstructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs it safe to use while the engine is running?\u003c\/h3\u003e\n\u003cp\u003eThe Lisle 20580 is built to be used with the engine operational so you can monitor real-time ignition behavior. As with any high-voltage work, follow standard safety practices: keep hands and tools clear of moving parts and use insulated grips when connecting or removing the tester.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for live testing without removing the spark plug\u003c\/li\u003e\n  \u003cli\u003eInsulated connections and boots reduce electric shock risk when used properly\u003c\/li\u003e\n  \u003cli\u003eObserve from a safe distance and avoid contact with rotating engine components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat sorts of ignition problems can this help diagnose?\u003c\/h3\u003e\n\u003cp\u003eThe in-line tester helps you spot weak or missing sparks, intermittent firing, and irregular spark patterns that indicate coil, wire, or distributor issues. It’s a simple first-step diagnostic before moving on to component replacement or advanced electrical testing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eQuickly identifies misfires and inconsistent spark delivery\u003c\/li\u003e\n  \u003cli\u003eHelps differentiate between ignition and fuel\/air issues\u003c\/li\u003e\n  \u003cli\u003eUseful for troubleshooting spark plug wires, coils, and connectors\u003c\/li\u003e\n\u003c\/ul\u003e\n\nWho is this for?\n\nThe Lisle 20580 is intended for professional technicians, backyard mechanics, and vehicle owners who need a fast, portable way to confirm ignition operation. It’s particularly useful when working on modern engines with coil-on-plug designs or when access is restricted. Keep it in a diagnostic kit for routine tune-ups, troubleshooting intermittent faults, or verifying repairs after replacing ignition components.\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this tester work on modern coil-on-plug engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The included 7\" extension lets you reach recessed coil-on-plug assemblies for live spark checks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use it while the engine is running?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the tool is designed for live testing, but follow safety precautions and avoid contact with moving parts.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Lisle","offers":[{"title":"Default Title","offer_id":67591001931961,"sku":"B09NMHFGXD","price":70.31,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/lisle-20580-front-view-spark-tester.jpg?v=1790540216","url":"https:\/\/redleafauto.ca\/products\/lisle-in-line-spark-tester-20580-7-extension-for-coil-on-plug-live-engine-testing","provider":"Redleaf Auto","version":"1.0","type":"link"}