2nd Generation Specific 1986-1992 Discussion

No Spark From Trailing Coil

Old 05-15-2004, 06:41 PM
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Ok, some background information. I have nos spark from the trailing coil. It is grounded I checked that. There is power going into the coil but not firing. The coil has also been tsted alone and is in good working condition. Anyone have any ideas? Thanks
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Old 05-15-2004, 06:48 PM
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well its pretty simple, the cas tells the ecu when to fire the coils. so if the leading works the cas -> ecu part works. the ecu could be bad, or the wires between the ecu and trailing coil, or the trailing coil
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Old 05-15-2004, 06:54 PM
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Thanks for the response. The leading coil is firing, the car will start like a lot of other one's i've seen with this problem. No tach like usual. so you think ECU?
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Old 05-15-2004, 07:14 PM
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possibly the ignitor? If you take apart the ignitor you'll see a small circuit board, it's possibly a wire has come loose or it has burnt up.



I also check all your connections. It might be something simple.
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Old 05-15-2004, 07:32 PM
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Originally Posted by greenfaceman' date='May 15 2004, 03:54 PM
Thanks for the response. The leading coil is firing, the car will start like a lot of other one's i've seen with this problem. No tach like usual. so you think ECU?
either the ecu, the wireing or the trailing ignitor/coil
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Old 05-15-2004, 07:45 PM
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Tach is triggered by the trailing ignitor - if the tach isn't working,

look to the ignitor.

Disconnect the 4 pin connector on the trailing ignitor. Tap the red

wire going to the coil pack with +12 volts - this should fire the

front trail plug (and make the tach needle twitch). If it doesn't,

the ignitor or the coil is bad - either way you can pick up another

trail module (coils/ignitor/all of it) pretty cheap.
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Old 05-15-2004, 07:48 PM
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Thanks guys. I have another 3-4 packs so I will give another a shot. I checked for continuity in the wires so I know they are good.
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Old 05-15-2004, 07:50 PM
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Oh Yeah, sorry for not saying this earlier. The tack jumps on start up then just stops.
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Old 05-16-2004, 07:50 AM
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That's actually a very useful piece of information. See if the trail

plugs are firing when the engine cranks.
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Old 05-16-2004, 01:34 PM
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The tack jumps. But they are not firing even when it cranks.
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