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Hi. Please, just also check the ignition cables. The following protocol help me with diagnosis:
a) Midnight test: Start on night without light and with the engine bay open, if you see or hear sparks flying on the ignition wires, you need to change all cables. If you see a corona aura around the wires, you need a more diameter cables or your cables are too old or marginal (change it). If remain dark, pass the hand over the cables trying to start at the same time, if are safe to pass the fingertips over the cables, they are ok, if you get pinched, the cables need change.
b)Peel back test: Shut off engine. Disconnect wire from spark plug and bend back the boot to expose the wire insulation. If you see a clear line between the exposed and the protected insulation, then the insulation is porous as best and contaminated at worst. On that case, change the wire.
c)Flex test: Remove the wire (test every ignition wire), connect a multester as ohmimeter (ohms) between both terminales of the cable. Flex the wire back and forth, pullin over the entire lenght. If you feel any britleness or the multitester measurement change as you flex the wire, change the wire.
(protocol source: C. Jacobs, Ignition performance systems. Hpbooks, 1999).
Cables will be changed every 4-5 years. No one include it on the maintenance schedule.
Happy volving
Joaquin
Rojo 121 Amazon
Lima Peru
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