Ignition Lead - Bosch Australia

Diagnostics and Common Ignition Lead FaultsDiagnostics and Common Ignition Lead Faults | A9Typical OE / carbon core wireKV 12.1KV 12.6KV 12.9 KV 12.4 KV 11.9KV 13.4KV 13.1KV 12.2Cyl. 1Cyl. 2Cyl. 3 Cyl. 4 Cyl. 5Cyl. 6Cyl. 7Cyl. 8KV 9.6 KV 10.0 KV 10.3 KV 9.9 KV 9.5 KV 10.7 KV 10.4 KV 9.7FSA 450The FSA 450 system tester incorporates a 4 channeloscilloscope, ignition analyser and engine analyser with adigital multimeter. This hand-held tester is highlyportable, lightweight and can be powered from thevehicles 12V electrical system or via the supplied mainspower unit. Incorporating a robust touch screen this unitis perfect for test drive evaluation.Cyl. 1 Cyl. 2 Cyl. 3 Cyl. 4 Cyl. 5 Cyl. 6 Cyl. 7 Cyl. 85600 Ω per metre inductive coreInductive Core DifferenceFig. 4 Simulation of typical diagnostic equipment.Common Fault 1Cables exhibit an arcing effect, especially when wet orhumid. Corona vs. Dielectric Leak.DIELECTRIC LEAK - Evident by intense shock and noiseAction - Replace leads.Refer to Fig. 1.Common Fault 2Engine misfires or stalls after recent lead installation.Action - Check if spark plugs are fitted correctly. Loosespark plugs dissipate less heat and burn terminal.Or replace terminal connector.Refer to Fig. 3.CORONA - In damp humid conditions a faint glow may beobserved at night along leads or on spark plug insulators.The colour is usually faint purple. This is a normalcondition known as corona discharge and is harmless tothe lead and the vehicle. Refer to Fig. 2.Fig. 3 Loose FitmentFig. 1 Dielectric LeakFig. 2 Corona DischargeCommon Fault 3Engine analysers generate different data from Boschinductive core leads vs. other carbon core leads.Reason: Increased coupling between cable and the testerpick up.Note: Coil output is reduced compared to high resistancelead. Refer to Fig. 4.2009 | 2010 Bosch Automotive Aftermarket