leading spark vs trailing spark

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leading spark vs trailing spark

RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections.

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06-07-2014, 05:59 PM	#1
speedjunkie RCC Loves Me Not You Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (1) Posts: 2,089 Rep Power: 19	leading spark vs trailing spark I've been having issues with starting my car for a while now. Myself and some buddies have been troubleshooting every so often over the past few months and we've tried quite a few different things. However, we've noticed that the spark on the leading plugs is not as big or strong as the trailing spark. I've swapped a few parts with my roommate...leading coil, spark plug wires, coil harness...still no change. This is using stock coils and stock NGK plug wires, and I've been using 9s for all four plugs for quite a while, along with a Twin Power, but we don't have the TP hooked up at the moment for troubleshooting (it's been disconnected since a few weeks ago when we last worked on it). So, is the trailing spark supposed to be larger and stronger than the leading spark, or vice versa? We took some video and I'm trying to get them off my phone and onto the computer at the moment, but I figured I'd ask first. If I can ever get the videos on here, you'll also notice that sometimes it cranks faster than other times. I'm thinking that might be another problem and I'm trying to track that down too, but I want to check on this first. It cranks faster a lot more often since we've been messing with the ignition system, so we thought that might be an indicator.

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