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Guide price: £20
Last updated on 9th Nov 2012
Adjust the spark tester gap to 20mm (normally) and notice the spark produced. Straight and violet blue in color indicates the ignition coils is NORMAL . If the coil (Ignition Leak Checker) has aged or defects, the spark is either red or curved in shaped.For higher compression ratio engines, bigger spark gaps are needed. In order to get better results, the tester spark gap needs to be adjusted when doing the test.