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ISOLATE WHICH ONE IS MISFIRING, THEN CHANGE THE PLUGS ROUND TO SEE IF SAME ONE IS MISS FIRING, IF IT CHANGES TO OTHER ONE WHERE YOU PUT PLUG INTO THEN CHANGE THE PLUG, IT COULD BE A COIL PACK THOUGH. Sorry caps.
You might want to pressure test the cooling system and remove the #3 spark plug. After the pressure tester sits on there for a few hours look into the combustion chamber to see if there is coolant. Misfires like these can sometimes be the result of a leaky head gasket. Also white smoke in the exhaust can be a sign. I assume the spark plug looks good?
Some vehicles don't run well with the platinum plugs. It will cause the engine to misfire and skip. I would go back with the OEM or a step above unless your car came with platinum plugs which is doubtful. The plugs may be firing off correct when cold but as the engine warms and more friction is there the plugs may be doing more bad because it's not firing correct from the plug being warm. It sounds strange but I work for BOSCH and there are alot of things that don't seem normal to someone that's not involved in making these parts and seeing the everyday test and use. Good Luck. Let me know what you find out and what works.
the chances are good for the number 5 coil needing replacement, but before i did anything else i would change that cam sensor, that could be causing your problem all the way around.. hope this helps... setting timing is a big drawn out job, i dont think you will need to do that, timing shouldnt be out.
no your problem is definately the dizzie cap, as i found out to my cost on a lansia beta. any kind of crack in ur dizzie will cause probs. best way to find out is park your car in the dark open bonnet with engine running then get a mist spray with water in it spray at dizzie and you will see a slight yellow arc around the crack! any crack in bakelite distributors leads to loss of one or more banks
Wish I could help!! My MX 5 has the same problem!! Tries to fire as soon as I turn the key, misses, then just cranks. This was a random occurrence until last week, then it decided it was not going to start at all. It will start fine with a push, then problem disappears again for a few days!! All I can think it is either a. coil pack, b. cam position sensor, or c. a relay somewhere in ignition or fuel system that is opening/closing to prevent engine running.....HELP!