K9 GSX-R 1000 C28 code - Suzuki GSX-R Motorcycle Forums Gixxer.com

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post #1 of 31 (permalink) Old 05-23-2016, 06:14 PM Thread Starter
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K9 GSX-R 1000 C28 code

Where do I start? Seems to be running rich also, exhaust smoke coming out. I pulled the code I get C28. Any help would be greatly appreciated. The F1 light was only coming on when it gear but comes on instantly now.
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post #2 of 31 (permalink) Old 05-23-2016, 07:16 PM Thread Starter
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Went outside with engine cold. Crank it up. No F1 light but some smoke, can't tell the color but definitely not oil smell. Ideas?
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post #3 of 31 (permalink) Old 05-23-2016, 07:55 PM
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Re: K9 GSX-R 1000 C28 code

Welcome to the site...

White smoke = coolant
Blue smoke = oil
Black smoke = fuel

The c28 code is your STVA. Do a search for posts by @TheGeek , he is our resident expert on those things.

Oh, and it is FI, not F1.
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post #4 of 31 (permalink) Old 05-23-2016, 08:01 PM Thread Starter
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Dang it. Thought I might of had it mixed up haha. But yeah I have. I've read pretty much every forum that talked about my year bike. ... it was too dark to tell what color the smoke was. Wasn't white and didn't smell like oil. So I think it's a lean rich issue.
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post #5 of 31 (permalink) Old 05-23-2016, 08:04 PM Thread Starter
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Let me clarify. Every forum that talked about the c28 code.
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post #6 of 31 (permalink) Old 05-23-2016, 08:09 PM
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Re: K9 GSX-R 1000 C28 code

Ok, so you learned how to fix it? Because TheGeek goes into extreme detail on what to do and how to fix it.
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post #7 of 31 (permalink) Old 05-23-2016, 08:20 PM Thread Starter
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Well I read that his fix only applies to the older bikes.
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post #8 of 31 (permalink) Old 05-23-2016, 09:31 PM
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Re: K9 GSX-R 1000 C28 code

jjman likes this.
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post #9 of 31 (permalink) Old 05-24-2016, 06:03 AM Thread Starter
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About to look at that video now. Thanks
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post #10 of 31 (permalink) Old 05-24-2016, 06:04 AM Thread Starter
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OK so that's an 05. Does the same fix apply to my machine? I have the 09-14 engine.
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post #11 of 31 (permalink) Old 05-24-2016, 06:37 AM
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Re: K9 GSX-R 1000 C28 code

I don't think it is the same...
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post #12 of 31 (permalink) Old 05-24-2016, 06:55 AM
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Re: K9 GSX-R 1000 C28 code

Nope. The 1000cc bikes use Keihin throttle bodies rather than Mikuni. The Mikuni flaw is limited to the 04-05 600/750. The Keihin units are a much better design. Typically a C28 code on one of them is due to:

1) A faulty ECU
2) A wiring problem
3) A faulty STP sensor
4) A botched powercommander install.


That being said, what's the history on the bike? Did this just pop up, or was there some work done recently?
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post #13 of 31 (permalink) Old 05-24-2016, 08:33 AM Thread Starter
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I had an oil leak so I just got finished reassembling the bottom half of the engine. So you might as well say a full tear down. Was running perfect before. I could have rolled it over and knocked the tps out of setting when I had it on the bench.
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post #14 of 31 (permalink) Old 05-24-2016, 08:37 AM Thread Starter
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The first two times the light came on I had to put it in gear and attempt to go forward for it to come out.
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post #15 of 31 (permalink) Old 05-24-2016, 08:52 AM
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Re: K9 GSX-R 1000 C28 code

At this point, I'd go over the wiring to make sure something wasn't damaged and that everything was reconnected properly. Then I would put a multimeter on the STPS (sensor mounted to the STVA) and check the calibration.

I'm guessing you have a factory service manual.... 1A-80.
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post #16 of 31 (permalink) Old 05-24-2016, 09:37 AM Thread Starter
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I do. Pretty sure I already checked that. Maybe I didn't do it properly though. How can I check it with the butter fly closed? Opened is easy, just cut the ignition on.
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post #17 of 31 (permalink) Old 05-24-2016, 09:41 AM Thread Starter
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Yeah I think I didn't read well. Going to do the test now.
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post #18 of 31 (permalink) Old 05-24-2016, 09:56 AM Thread Starter
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Supply voltage looks good
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post #19 of 31 (permalink) Old 05-24-2016, 10:20 AM Thread Starter
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So my readings are. .74 closed to 4.35 open. According to manual it should max at 4.1 have I found my problem?
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post #20 of 31 (permalink) Old 05-24-2016, 10:25 AM Thread Starter
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I think the STPS may be stripped out and opening up too much. It appears that it's opened too wide and the little arm on the opposite side was bent I had to bend it back.
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