General Category > General Discussion
2010 K1300GT
Wizwam:
Continued over rich mixture caused by failing coil(s) can contaminate the lambda sensor and cause inaccurate readings or even failure. Seen this before.
Honolulu:
:(
Perhaps so. However, it's actually NOT running well. When I changed the 02 sensor, I ran it for only 20 seconds and thought all was well.
Now, a week later, I've put in a Stebel horn and was about to change the oil, which requires warming it up. So I started it... and it's just as bad as before... pulsing or "panting". I'm severely disappointed, not least because I've now put about USD 750 in the bike, for nothing but practice. At least the horn works, but I can only use it in the garage. My wife noticed and suggested I not toot the horn in the garage again.
Next suspect is the idle control valve at the bottom of the airbox, which requires significant disassembly, and I'm not looking forward to removing the airbox from the rubber tubes connecting to the throttle bodies. I understand I can use narrow screw clamps in place of the original Oetiker clamps that BMW seem so fond of. Need to acquire some of those in the correct size, wonder what size is needed, will consult fiche.
I will post real-time log for the bike in another post. We can all lsee it then and perhaps it will point to a sensor or actuator that's on vacation.
Honolulu:
Okay finally got her into the garage for a session. All the static checks appear to be okay.
It started poorly and if I gradually tried to increase throttle, it would die. Sudden increase to 3000 rpm was okay but still poor running and got black smoke when revved. I logged values for a short while. The O2 sensor reading is at 0.9 volts, clearly it's running far too rich. And this time, I believe the reading.
Coils, plugs and 02 sensor are new. I need correct diagnosis and I need to stop throwing parts at this bike.
I've attached the .csv file and the Autoscan report. Can anyone tell, from this data, why the bike is fueling so rich?
Suspects include a faulty fuel pressure regulator (fuel pressure too high?)
Honolulu:
It seems there is a solution and it's largely NOT what has been considered in this forum.
The dealer hooked it up and communicated with Hans und Fritz, and as posted above, the GS-911 returned constant fuel pressure readings of about 2700 (millibars? kPa? psi? no one says) despite changing rpm. However the actual measured pressure was MUCH higher, causing overfueling.
Apparently the fuel pressure sensor on the fuel rail was kaput. Sensor replacement requires considerable work, so I authorized the work. It'll cost about USD$1000. Despite the sensor being used in a handful of bikes since 2004, it isn't in stock, will take some 3-5 days to come in and should be installed in a day. So, the bike will be at the dealer for about a week.
Close it out: I'm disappointed in the advice given on this thread, in accordance with which I spent some $800 for new coils, plugs and 02 sensor, and vacuum fitting for coolant filling, which purchases that only enriched the vendors. Now another grand for dealer work. The GS-911 might have pinpointed the problem if only I had baseline data to compare to, but no one could, or has yet, come up with such data on the real-time functions reported. What (expletive deleted) good is a measurement without a baseline to compare it to? We're not mechanical mind readers nor do we converse daily with the factory. I get that a modern machine is expected to be complex but most of this bike goes back almost 10 years. Where's the info? I don't hope or expect it will appear here. At best, I got free advice and it was worth exactly that.
Jughead:
--- Quote from: Honolulu on June 17, 2019, 09:37:24 AM ---It seems there is a solution and it's largely NOT what has been considered in this forum.
The dealer hooked it up and communicated with Hans und Fritz, and as posted above, the GS-911 returned constant fuel pressure readings of about 2700 (millibars? kPa? psi? no one says) despite changing rpm. However the actual measured pressure was MUCH higher, causing overfueling.
Apparently the fuel pressure sensor on the fuel rail was kaput. Sensor replacement requires considerable work, so I authorized the work. It'll cost about USD$1000. Despite the sensor being used in a handful of bikes since 2004, it isn't in stock, will take some 3-5 days to come in and should be installed in a day. So, the bike will be at the dealer for about a week.
Close it out: I'm disappointed in the advice given on this thread, in accordance with which I spent some $800 for new coils, plugs and 02 sensor, and vacuum fitting for coolant filling, which purchases that only enriched the vendors. Now another grand for dealer work. The GS-911 might have pinpointed the problem if only I had baseline data to compare to, but no one could, or has yet, come up with such data on the real-time functions reported. What (expletive deleted) good is a measurement without a baseline to compare it to? We're not mechanical mind readers nor do we converse daily with the factory. I get that a modern machine is expected to be complex but most of this bike goes back almost 10 years. Where's the info? I don't hope or expect it will appear here. At best, I got free advice and it was worth exactly that.
--- End quote ---
Honolulu, maybe you should go back and have a look at which forum this is, because clearly you have missed it completely.
This is a GS911 forum, not a mechanic's forum, not a BMW forum, not a K1300GT repair forum. Get it? "Where's the info?" you ask. Why should the info be here? The info you want has nothing to do with the GS911.
If you have questions about the GS911, this is where you come. This is where many will use their free time to read your post and attempt to assist you, based on the knowledge of the GS911 and not your particular model of bike, despite the advice being ignored. Yes, this advice is free, which is exactly what you were after in the first place.
If you have questions about your 1300GT, go to the 1300GT forum, or any one of the others of your choice. Maybe that is where you will find your info. That is also where you can leave your sarcasm and disappointment.
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