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Old 06-28-2012, 08:50 PM   #1
brlabrune
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98 750 srad headache!!!

Hello All!

I'm nearing baldness with my 98 GSXR 750. It's not getting spark nor power to the coilpacks. I've changed the battery,fuses,CDI,Kisckstand sensor,TOS,sparkplugs,ignition switch & pulser. I have no idea what else it could be. I would think it could be the coilpacks but since there is no power to them, it has to be somethin else. Anyone else had an issue like this??
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Old 06-28-2012, 09:46 PM   #2
THE SRADIATOR
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Re: 98 750 srad headache!!!

Relay in the fuse box?
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Old 06-28-2012, 10:16 PM   #3
williamhbonney
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Re: 98 750 srad headache!!!

Bad ground?
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Old 06-28-2012, 11:58 PM   #4
brlabrune
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Re: 98 750 srad headache!!!

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Originally Posted by THE SRADIATOR View Post
Relay in the fuse box?
I haven't checked that. Would that have any control on spark?
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Old 06-28-2012, 11:59 PM   #5
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Re: 98 750 srad headache!!!

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Originally Posted by williamhbonney View Post
Bad ground?
I checked and double checked the ground and it's got a good connection.
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Old 06-29-2012, 12:03 AM   #6
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Re: 98 750 srad headache!!!

Quote:
Originally Posted by brlabrune View Post
i haven't checked that. Would that have any control on spark?
w.d.y.t?
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Old 06-29-2012, 12:12 AM   #7
brlabrune
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Re: 98 750 srad headache!!!

Quote:
Originally Posted by THE SRADIATOR View Post
w.d.y.t?
Don't know, that's why i asked. TMK, thats a flasher relay. Am i incorrect? Is there a way to test it?
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Old 07-14-2012, 11:48 AM   #8
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Re: 98 750 srad headache!!!

I got a new relay for the fusebox, installed it and still no spark. I've traced wires and all look good. What else coulc cause zero spark at the coils?
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Old 07-14-2012, 11:53 AM   #9
ccmhunt
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Re: 98 750 srad headache!!!

I am a carb/motor/engine anything but electronic guy, but could it be; clutch safety switch?
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Old 07-14-2012, 12:22 PM   #10
Knight2211
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Re: 98 750 srad headache!!!

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clutch safety switch?
That should only effect the starter getting power to turn the bike over, not the "spark" part of the ignition system.
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Old 07-14-2012, 06:34 PM   #11
Maj750
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Re: 98 750 srad headache!!!

98 is not constantly powered like an inductive system you will not have 12v at the coil, its cdi, hits the coils with 90v each at firing, a peak hold tester will check firing voltage, ac settings on the multimeter may also read it at cranking
probably check the connectors at the ecu , make sure there is no corrosion, make sure your grounds are clean, are the cam and crank sensor both functioning right
and is the inlet cam pin at the correct installed height
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Old 07-14-2012, 11:30 PM   #12
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Re: 98 750 srad headache!!!

No corrosion on ECU pins / connections. The main ground that connects to the negative side of the battery is clean. Not sure how to troubleshoot a cam / crank sensor. Any tips?
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Old 07-15-2012, 11:36 AM   #13
H00kster
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May be a internal fault to the ecu. If you power ground and continuity checks are all good and you've ruled out all other options that can prevent the bike from starting what's left. You do have a good charge on the battery right, all other electronics work?


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Old 07-15-2012, 06:32 PM   #14
Maj750
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Re: 98 750 srad headache!!!

Also the spade connector near the the main gnd terminal
realy need a peak hold to measure with multimeter or an occilloscope to check v out from the crank and cam sensors, maybe ac settings will show it
i think a peak hold is just a capacitor ?? Sradiator or anyone else more familiar with them ?? when i was troubleshooting mine i just borrowed it from my dealer, but not everyone has the interaction i do with there dealers
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Old 07-15-2012, 10:54 PM   #15
brlabrune
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Re: 98 750 srad headache!!!

Quote:
Originally Posted by H00kster View Post
You do have a good charge on the battery right, all other electronics work?


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I just charged the battery to full strength and tried. No spark again. I'm really at a loss on this one. I'm not sure what else i could be missing here.
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Old 07-15-2012, 10:56 PM   #16
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Re: 98 750 srad headache!!!

[QUOTE=Maj750;5700802]Also the spade connector near the the main gnd terminal


Spade terminal is clean.
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Old 07-17-2012, 12:07 PM   #17
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Re: 98 750 srad headache!!!

have you checked your tip over sensor to make sure it didnt fall over?
The tip over will let the bike crank but never fire. Tho it should give a Fi code as well.

John
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Old 07-17-2012, 10:14 PM   #18
brlabrune
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Re: 98 750 srad headache!!!

Quote:
Originally Posted by GSXR-Freak View Post
have you checked your tip over sensor to make sure it didnt fall over?


John
Yes- I did the TOS remedy where you fill it full of silicone so its doesn't activate. The ring was in dead center. I also bypassed the TOS just for good measure and still no spark.
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Old 07-17-2012, 10:17 PM   #19
brlabrune
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Re: 98 750 srad headache!!!

This motor came out of a carb'd bike as the original motor was needing rebuilt, but the changes were done to mirror the FI engine. I'm out of ideas on this one, it may just need to be boned out at this point.
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Old 07-18-2012, 02:09 PM   #20
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Re: 98 750 srad headache!!!

I know you can bypass the TOS, but you can not just jump the wires. It needs to be connected for it work.

So you swapped the cams? The crank sensor? Kept your FI ECU and gauges?

John
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