there's 4 iginiton coils..
1.i start the engine(you will nontice that the engine is vibrating heavily and the sounds of 3 pstons running)
2.unplug the ignition coil socket starting from one end-say,front to back.
2.1.unplug the 1st coil and hear/check if theres any significant changes of vibrations from the engine.
-->if there's a sgnificant changes ie:engine vibrate's more heavily and the RPM reduced,means this coil
ok so plug back this coil.
2.2.continue the same procedure(2.2.1) until you unplug the coil socket where there will be no effect on the engine,means this is the
faulty ignition coil.
3.After the faulty coil is located,try to replace with the working coil and practice procedure 2.2.1.
example: 4 pistons:
piston1 coil1
piston2 coil2
piston3 coil3
piston4
coil4
piston1
coil4
piston2 coil2
piston3 coil3
piston4 coil1
lets say coil 4 at piston4 faulty,when u connect/disconnect coil socket it doesn't give any effect.
now replace
coil1 to
piston4 then connect/disconnect it shuld give effect on the engine.
when coil4 is at piston1 it does not give any effect/response when connect/disconnect the coil socket.
therefore the coil4 is faulty and should be replaced.
Hope my explaination help in any way possible~~cheers
