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homemade ignition question

Old 12-05-2006, 05:46 AM
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Default homemade ignition question


I have an old subaru loyale that doesn't have spark at the coil. I replaced the coil $20. at advanced auto and nothing The disty sends an optical signal to the ecu, the ecu sends a signal to the ign amplifier, amplifier sends signal to coil. So, i'm suspecting that the amplifier is bad and it's perm. attached to the coil bracket, To replace it the stealership wants $300.+ for a new coil and bracket combo. (the only way they sell it) My question is, Does anyone know about GM Ignition modules and how I might be able to use one of those instead? BTW, They're about $20.

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Old 12-05-2006, 08:00 AM
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Default Re: homemade ignition question

Your ecu won't drive the GM ignitor. Are you unable to find the equivalent in a scrap yard?

Might i suggest buying a length of rope instead?
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Old 12-05-2006, 09:15 AM
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Default Re: homemade ignition question

I'm sure I can find one at the junkyard but it would be old and may not last long. Why don't you think the ecu won't drive the ignitor? I have seen it done on several rotaries, probes and mx6's and the mx6's are driven from a ecu signal but I'm not sure on wiring it. Now go get your own rope.
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Old 12-05-2006, 09:27 AM
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Default Re: homemade ignition question

you would need a wiring diagram for both cars to even have a chance. but odds are voltage levels would be different. but hey, give it a shot. i would love to see it work. im not sure if the loyale is really worth the effor t though. i had one of those cars. incredibly slow
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Old 12-05-2006, 09:46 AM
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Default Re: homemade ignition question

I know it's slow, but it's 4wd and I bought it for a work/winter beater so I wont rack up miles on my other cars. I bought it for $300. So I don't mind putting a little money into it. But I don't want to buy a $300. coil and ignitor either. The signal from the ecu isn't strong enough to trigger the coil and the ignitor bumps it up. They all basically do the same thing no matter what brand. The reason people use the GM ignitors is because they are cheap. I'll try to figure it out and maybe post pics if it works.
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Old 12-05-2006, 09:58 AM
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Default Re: homemade ignition question

just found this....... I wont have all of those wires because my ignitor is already external and the 1kohm resistor is for the tach signal but I think mine is driven straight from the ecu.
Attached Thumbnails homemade ignition question-633391_125_full.jpg  
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Old 12-05-2006, 03:19 PM
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well, good luck. if it works post pics
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Old 12-07-2006, 07:23 PM
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Default Re: homemade ignition question

I know my old 87 nissan pickup had the optical setup for the ignition...maybe could check into one of those. But an msd box would probably be the easiest.
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Old 12-18-2006, 02:59 PM
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Default Re: homemade ignition question

i don't know if this post is dead or not or whether or not you have fixed it, but what kind of gm ignition module are you talking about, the module from a gm HEI system? if that's the case the HEI system's don't have any ecu input, they rely on vaccum advance and/or centrifugal advance in the dizzy itself, the module converts the signal from magnectic reluctor and then sends the signal to the coil. hope that helps
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