2nd Generation Specific 1986-1992 Discussion

Ecu Cuts Spark To Rear Rotor

Old 12-21-2003, 01:03 PM
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Anyone have hard info on whether the ECU might cut spark to the rear rotor, and, if so, when?



My project TII suddenly started running on 1 rotor, and I have checked all the obvious stuff, (including power to coils, fuel and compression). Verified spark only to front leading plug with a timing light.



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Old 12-21-2003, 01:28 PM
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You may have a bad coil. My rear coil started shorting out on me a while back. It turned out to be a bad coil.
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Old 12-21-2003, 01:32 PM
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Originally Posted by 7mech' date='Dec 21 2003, 11:28 AM
You may have a bad coil. My rear coil started shorting out on me a while back. It turned out to be a bad coil.
the same coil provides leading spark for front and rear rotors, and the front rotor is sparking fine (and the coil has tested fine)
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Old 12-21-2003, 01:34 PM
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smoking alot?? if it smells like gas out the tail pipe then your fuel injectors are probably working fine. ignition is about the only thing that could do that
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Old 12-21-2003, 01:38 PM
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fouled plug?? if it's just running on trailing in the rear then it would be very weak.



swap plugs and plug wires (keep the plug and plug wires together) swap on coil as well to check.
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Old 12-21-2003, 01:39 PM
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pull out the plug and (with an insulated glove) touch the side of the plug to the body and have someone crank it to find out for sure.
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Old 12-21-2003, 01:40 PM
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Originally Posted by mazdadrifter' date='Dec 21 2003, 11:34 AM
smoking alot?? if it smells like gas out the tail pipe then your fuel injectors are probably working fine. ignition is about the only thing that could do that
yep, like i said, i have fuel and compression
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Old 12-21-2003, 01:43 PM
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Originally Posted by mazdadrifter' date='Dec 21 2003, 11:38 AM
fouled plug?? if it's just running on trailing in the rear then it would be very weak.



swap plugs and plug wires (keep the plug and plug wires together) swap on coil as well to check.
the plugs are clean, the wires are in spec, and the leading coil is fine. the timing light is showing a spark -only- on the front leading plug, so it seems like a signal issue to me, which is why i'm sniffing towards the ECU..
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Old 12-21-2003, 08:42 PM
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the dead rotor lit up again after i swapped out the tested-to-be-in-spec OEM wires for a set of Jacobs i had on hand.



ah well it runs and goes like.. something really fast



thanks for the suggestions, guys
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Old 12-21-2003, 08:45 PM
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good to hear
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