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Home >> Land Rover >> 1994 >> Defender 90 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures - 3.5L, 3.9L & 4.2L >> Ignition Systems >> Ignition System >> Test 6
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Test 6

Remove distributor cover. See Fig 1 . Disconnect coil high tension lead from cover, using insulated pliers hold about 3 mm (0.13") above rotor arm electrode and crank the engine. There should be no high tension sparking between rotor and high tension lead. If satisfactory carry out TEST 7  . If high tension sparking occurs, an earth fault on rotor arm is indicated. Fit new rotor arm. If engine will not start carry out TEST 7  .

Fig 1: Test 6: Rotor Arm Ground Test
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