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Hi Everyone
I recently had a coil pack fail highlighted by a misfire on cylinder 1. I took out the plug, turned over the engine and sure enough no spark on cylinder 1. I then checked the spark on cylinder 2 and it was perfect so i swapped the plug and lead on cylinder 1 and 2. The fault stayed on cylinder 1.
I then emoved the coil pack and both primary and secondary coils tested fine for resistance but as I knew the leads and plugs were good I knew it could only be the coil pack and sure enough changing the coil pack cleared the fault.
So my question is how can a wasted spark coil pack fail in such a way that the spark is lost on only one cylinder? If cylinder 1 plug was not sparking how was the circuit being made for the companion cylinder?
The only reasonable conclusion i can come to is that although cylinder 1 was not sparking it was still somehow conducting allowing the circuit to complete through both plugs. If this is the case what failed in the coil pack that only affected the cylinder 1 spark and not its companion?
Am I missing something here?
Thanks
I recently had a coil pack fail highlighted by a misfire on cylinder 1. I took out the plug, turned over the engine and sure enough no spark on cylinder 1. I then checked the spark on cylinder 2 and it was perfect so i swapped the plug and lead on cylinder 1 and 2. The fault stayed on cylinder 1.
I then emoved the coil pack and both primary and secondary coils tested fine for resistance but as I knew the leads and plugs were good I knew it could only be the coil pack and sure enough changing the coil pack cleared the fault.
So my question is how can a wasted spark coil pack fail in such a way that the spark is lost on only one cylinder? If cylinder 1 plug was not sparking how was the circuit being made for the companion cylinder?
The only reasonable conclusion i can come to is that although cylinder 1 was not sparking it was still somehow conducting allowing the circuit to complete through both plugs. If this is the case what failed in the coil pack that only affected the cylinder 1 spark and not its companion?
Am I missing something here?
Thanks