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Wiring and Electrics Questions, answers and posts pertaining to electrical mods and problems

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Old 03-10-2012, 05:39 PM   #1
steviemac
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Default Help... no spark!

Hi guys,

Ok, I was driving along and all of a sudden the bike looses power and starts to sound like a lawn mower and then dies. Got it home and cyclinders 1-4 not firing (pipes cold). After investigating I found that there was no spark from the left ignition coil that fires 1-4 so I put a new coil on but still no spark. I then checked the new coil with the wires from 2-3 coil and it works. I'm getting 11.5 volts from the o/w wire and continuity from the other wire back to the ecu and now I don't know what to check next. So, to recap, coil is fine and getting power from the o/w wire and other wire gets continuity back to ecu but still no spark.. What next?

Cheers, Steven (gsx600f 1989)
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Old 03-10-2012, 06:58 PM   #2
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Originally Posted by steviemac View Post
Hi guys,

Ok, I was driving along and all of a sudden the bike looses power and starts to sound like a lawn mower and then dies. Got it home and cyclinders 1-4 not firing (pipes cold). After investigating I found that there was no spark from the left ignition coil that fires 1-4 so I put a new coil on but still no spark. I then checked the new coil with the wires from 2-3 coil and it works. I'm getting 11.5 volts from the o/w wire and continuity from the other wire back to the ecu and now I don't know what to check next. So, to recap, coil is fine and getting power from the o/w wire and other wire gets continuity back to ecu but still no spark.. What next?

Cheers, Steven (gsx600f 1989)
The ground for those coils is through the bolts and into the frame. I'd suggest cleaning the crap out of all those areas and see if that helps.
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Old 03-11-2012, 08:30 AM   #3
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Done that and made no difference.. what now?

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The ground for those coils is through the bolts and into the frame. I'd suggest cleaning the crap out of all those areas and see if that helps.
Done that.. made no difference! any other suggestions?

Steven.

Last edited by steviemac; 03-11-2012 at 08:30 AM.. Reason: Automerged Doublepost
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Old 03-11-2012, 09:19 AM   #4
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I get 13 vdc on the top spade terminals on the ingnition coil and around 12vdc on the lower ones of my 89 gsx600f. If there is anything else I can check and compare for you let me know.
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Old 03-11-2012, 09:46 AM   #5
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Originally Posted by steviemac View Post
Hi guys,

Ok, I was driving along and all of a sudden the bike looses power and starts to sound like a lawn mower and then dies. Got it home and cyclinders 1-4 not firing (pipes cold). After investigating I found that there was no spark from the left ignition coil that fires 1-4 so I put a new coil on but still no spark. I then checked the new coil with the wires from 2-3 coil and it works. I'm getting 11.5 volts from the o/w wire and continuity from the other wire back to the ecu and now I don't know what to check next. So, to recap, coil is fine and getting power from the o/w wire and other wire gets continuity back to ecu but still no spark.. What next?

Cheers, Steven (gsx600f 1989)

Your most likely looking at a bad CDI or an issue with a wire between. The only economical test is to swap the cdi with a known good one. If you can rule out the CDI, then it's wiring between the coil and cdi.

Krey
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Old 03-11-2012, 11:12 AM   #6
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Your most likely looking at a bad CDI or an issue with a wire between. The only economical test is to swap the cdi with a known good one. If you can rule out the CDI, then it's wiring between the coil and cdi.

Krey
I was hoping that this wasn't the case.. Krey, could these symptoms have anything to do with the ignition pickup/signal generator?

Steven.
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Old 03-11-2012, 11:29 AM   #7
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I was hoping that this wasn't the case.. Krey, could these symptoms have anything to do with the ignition pickup/signal generator?

Steven.

I would doubt that would effect only 1 coil... I believe the signal generator issue would show for both coils.

Krey
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Old 03-11-2012, 02:51 PM   #8
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It would. Most likely issue is wiring from the CDI or the ground isn't as good as you think. Next most likely is the CDI.
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Old 03-12-2012, 04:46 AM   #9
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It would. Most likely issue is wiring from the CDI or the ground isn't as good as you think. Next most likely is the CDI.

Cheers for the input guys. As a backup I've ordered a cdi off fleabay for cheap, in the meantime how do I go about finding a ground issue? What sort of tests do I carry out? Where would I start?

Steven.
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