Sputtering - Suzuki GSX-R Motorcycle Forums Gixxer.com

 
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post #1 of 8 (permalink) Old 05-23-2018, 06:01 PM Thread Starter
Squid
 
Join Date: May 2018
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Sputtering

In need of some advice. I have a 2011 gsxr 1000. Recently installed lowering links and in the process had to remove the exhaust and since then is when the problem started. Never have I had this problem but today after riding about 10 min I could feel the bike start to sputter but when I would give it more throttle it would get past the sputtering and get back to it's normal power. The longer I rode the worst it got while trying to make it home. When I got home I noticed the exhaust was glowing and extremely hot. The only thing I can think of is that when I removed the exhaust I put it on a 2x4 under the bike to avoid removing the O2 sensor from the exhaust and it ended up being knocked off. I'm thinking it may have damaged the wires to the sensor when it fell and pulled on them. Any ideas would be helpful
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post #2 of 8 (permalink) Old 05-24-2018, 10:09 AM
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Re: Sputtering

When you say the exhaust was glowing, which part are you referring to? The headers near the engine or the muffler can? Did you somehow modify the exhaust, or did you just remove it and reinstall it? Do you see 'FI' flashing on the dash?
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post #3 of 8 (permalink) Old 05-24-2018, 12:54 PM Thread Starter
Squid
 
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Not on the header side more less near the cat. It's a jardine gp1 exhaust. All I did was remove it and slip it back on
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post #4 of 8 (permalink) Old 05-24-2018, 12:56 PM Thread Starter
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QUOTE=dpapavas;9500482]When you say the exhaust was glowing, which part are you referring to? The headers near the engine or the muffler can? Did you somehow modify the exhaust, or did you just remove it and reinstall it? Do you see 'FI' flashing on the dash?[/QUOTE] and no F1 flash untill I unplugged the O2 sensor.
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post #5 of 8 (permalink) Old 05-25-2018, 06:12 AM
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Re: Sputtering

Sputtering indicates improper fueling and a glowing exhaust indicates a (very) lean fuel mixture, which would lead to raised exhaust gas temperatures. I find it puzzling that the glowing starts so far downstream of the exhaust valves. One explanation, would be incomplete burning of fuel, leading to unburnt fuel in the exhaust, which then ignites near the catalytic converter, because you've left a leak there, introducing oxyge. Whatever the case, fueling seems to be off, and you don't have any fault codes, so, given the actions that led to the problem, I'd suspect you've somehow messed up with the HO2 sensor, which now (possibly due to the aforementioned leak) sends an incorrect, but within spec signal to the ECU.

Try disconnecting the HO2 sensor, to see if the sputtering goes away. Do not operate the engine more than you need to under these conditions, that is, if you see the sputtering is still there with the sensor disconnected, do not wait for the exhaust to start glowing to shut the engine down.
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post #6 of 8 (permalink) Old 05-25-2018, 08:33 AM Thread Starter
Squid
 
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I did start it with the O2 sensor off and by all means it doesn't run an smooth as it should which is expected but it does run better then before. I've already order a new sensor being I'm pretty sure that was my problem. The only time I get a F1 code is immediately after unplugging the o2 sensor. Then when I start it the code clears
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post #7 of 8 (permalink) Old 05-25-2018, 11:29 AM
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Re: Sputtering

Any chance you've introduced leaks in the exhaust, near where the HO2 sensor is mounted?
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post #8 of 8 (permalink) Old 05-25-2018, 01:00 PM Thread Starter
Squid
 
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No, I don't think so. I think when the exhaust was hanging under the bike by only the support of the O2 sensor it may have damaged one of the wires
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