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0213 Tempest Tech-Tip - The “Right” Way to Check Spark Plug Resistors

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Discussion about the “right” way to check spark plug resistance can go on until the cows come home. While what happens when 10,000 volts is forced across a resistor under laboratory conditions is interesting, it is hardly relevant to resolving the problems faced by IAs, A&Ps and AEs. The question is; “What’s causing the rough running engine and how can we fix it?” Conditions on a blazing hot or freezing cold ramp aren’t laboratory conditions. What we, as aircraft technicians, need is a useful available tool to identify a spark plug that might be causing a rough running engine.

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