Haven't used mine yet, but have borrowed other mechanics. This tool is great for identifying coil defects. Simply place over each coil when the engine is running and running again. This probe will tell you which coil is defective. easy to use and great time saver. I had a truck that shot back. Changed spark plugs, no difference. I borrowed this tool and it led me straight to two bad coils. Too bad I didn't use the tool before. Saved me money and time. I highly recommend this tool.
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