Multiple incidents reveal diverse spark plug failures, including internal resistor defects, insulator breakdowns, and physical detachment, directly causing severe engine malfunctions.
These spark plug issues lead to critical operational problems such as high EGT, rough engine running, power loss, preignition, and damage to engine components like pistons and cylinders.
Defective spark plugs are strongly linked to premature magneto failures and contribute to overall ignition system problems, reducing the service life of other components.
Excessive or inconsistent internal resistance in spark plugs is a recurring issue, impacting engine operation and performance despite a lack of published parameters.
The pilot noticed a high EGT reading. A magneto check revealed one of the eight spark plugs was not firing. Examination revealed resistance in five of the eight plugs exceeded the 2 MΩ limit. The internal resistors had failed and the current path was open. The resistors should have been about 1.5 kΩ.
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