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coils, ignition module problems: Solved

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Old Dec 11, 2010 | 10:31 PM
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Default coils, ignition module problems: Solved

car wasn't pulling strong to redline, thought my distributor belt is bad. I did the following tests:

1- with the right hand coil unplugged car doesn't start.
2- with the left hand coil unplugged car starts like before.
3- with the right hand coil only connected to belt driven distributor car starts like before. (belt is ok, left hand coil not working)
4- with the green and black wires switched from non working coil to the working coil car does not start.
5- with green and black wires switched from working coil to non working coil, car does not start.

when ignition is on and engine is off, both coils have power on the green and black wires. with engine on only right hand side coil wires has power.
do I have a bad coil as well as ignition module? could both go bad at the same time? or could it be a DME problem? Thank's in advance for any ideas.

Last edited by bassam; Dec 17, 2010 at 05:27 PM.
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Old Dec 12, 2010 | 04:01 PM
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Looks like you are having both a coil that is bad and the ignition module being iffy.

Do you have an ability to check the output of the Ignition Module? Generally you need an oscilloscope to check the signal output of the module.

The Terminals on the Module are:

Terminal 1 is Ignition Circuit 1
Terminal 7 is Ignition Circuit 2
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Old Dec 12, 2010 | 09:17 PM
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I dont have an oscilloscope, but I think you are right, I might need both. Thank's.
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Old Dec 12, 2010 | 10:58 PM
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Keep us updated
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Old Dec 17, 2010 | 05:30 PM
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replaced coil and ignition module. Car runs on all 12 spark plugs. bought 2 coils got 4!!! didn't know they come in pairs.
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