{"product_id":"lisle-20580-in-line-spark-tester-w-coil-on-plug-wire","title":"Lisle 20580 in Line Spark Tester W\/Coil On Plug Wire","description":"\u003cstrong\u003eLisle 20580 is an in-line spark tester that lets you safely view ignition spark activity and diagnose spark-related issues, including hard-to-reach coil-on-plug units.\u003c\/strong\u003e\n\n\u003cp\u003eThis compact handheld tester connects between a spark plug and its wire to display a clear, mirror-image flash of the ignition spark while the engine runs. Designed for professional mechanics and DIYers, the tool combines a double-ended short wire (straight and 90° boots) with an additional 7\" extension to reach recessed coil-on-plug applications. It’s a simple, visual way to confirm whether a spark is present without removing plugs or using bulky equipment.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the Lisle 20580 show if a spark is firing?\u003c\/h3\u003e\n\u003cp\u003eWhen installed inline between the plug and wire, the tester’s transparent window flashes each time the ignition fires, producing a visible mirror-image of the spark. This allows you to confirm spark presence and timing visually while the engine runs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInline installation between plug and wire for live testing\u003c\/li\u003e\n  \u003cli\u003eTransparent window displays spark flashes as they occur\u003c\/li\u003e\n  \u003cli\u003eWorks with most ignition systems for on‑the‑spot verification\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this tester reach recessed or coil-on-plug applications?\u003c\/h3\u003e\n\u003cp\u003eYes — the Lisle 20580 includes a 7\" extension plug wire specifically for coil-on-plug units and other recessed plugs. The extension gives extra reach so you can test plugs that are hard to access without disassembly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e7\" extension plug wire for deeper access\u003c\/li\u003e\n  \u003cli\u003eDouble-ended short wire offers straight and 90° boot options\u003c\/li\u003e\n  \u003cli\u003eFits many modern engines with tight spark plug locations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs the tool safe and easy to use during engine operation?\u003c\/h3\u003e\n\u003cp\u003eDesigned for hands-on troubleshooting, the tester lets you observe sparks with the engine running while maintaining a secure connection to the plug\/wire. Use basic safety precautions and keep clear of moving parts and hot components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConnects inline; no need to remove spark plug for observation\u003c\/li\u003e\n  \u003cli\u003eVisual indication reduces guesswork in ignition diagnostics\u003c\/li\u003e\n  \u003cli\u003eCompact, lightweight design suited for bench or roadside checks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat types of ignition issues can this tool help identify?\u003c\/h3\u003e\n\u003cp\u003eThe tester helps isolate ignition-related faults by confirming whether a spark is present at each plug location. It’s useful for narrowing down misfires, weak spark, wiring problems, and coil failures as part of a systematic diagnosis.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDetects absent or intermittent sparks at individual cylinders\u003c\/li\u003e\n  \u003cli\u003eUseful for diagnosing wiring, coil, and connector issues\u003c\/li\u003e\n  \u003cli\u003eComplements compression and fuel-system checks for full troubleshooting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Lisle 20580 is aimed at professional technicians, home mechanics, and automotive enthusiasts who need a fast, visible way to check spark delivery without complex test equipment. It’s ideal when you need a quick on‑engine confirmation of ignition activity, particularly on engines with recessed plugs or coil‑on‑plug arrangements. Keep it in a tool roll or shop bench for routine troubleshooting, maintenance checks, and rapid in-field diagnostics.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use the Lisle 20580 on coil-on-plug engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It includes a 7\" extension wire designed to reach recessed coil-on-plug locations for inline spark observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this tester damage the ignition system?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. When used correctly the tester only observes the spark; follow safety steps and avoid contact with moving engine parts.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Lisle","offers":[{"title":"Default Title","offer_id":48087606198430,"sku":"B09NMHFGXD","price":40.46,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/lisle-spark-tester-frontview.jpg?v=1785926547","url":"https:\/\/northtrailauto.ca\/products\/lisle-20580-in-line-spark-tester-w-coil-on-plug-wire","provider":"North Trail Auto","version":"1.0","type":"link"}