dehning Posted July 1, 2013 Share Posted July 1, 2013 Hi all, I've had my '02 XX for 5 years now, love the thing to death. I have put about 15,000 miles on it, the vast majority of which is commuting. In the last few days something a little troubling started. Last week on the way home it lost engine power for about 1/2 a second, it came right back and was fine the rest of the way home. This morning I was about 10 miles out and it did it again twice, separated by about a minute. Not wanting to risk being stranded, I turned round and went home to swap bikes, it never hesitated once on the way home. I have racked my brain about what would cause this and I am looking for any ideas, here are some notes/points: * I have not changed anything whatsoever on the bike in a couple thousand miles now (short of an oil change and chain lube) * Bike has ~29,000 miles on it. * It has happened at 95 and 75 degrees fahrenheit (I'm in Texas). No water/rain whatsoever. * The clock/trip meter doesn't reset when the hesitation happens and there is no misfire. * I have a Power Commander III-USB with a custom tune for my setup (K&N air filter and full Yoshi 4-1 system) * I'm still on the original battery that came with the bike which cranks easily and the bike starts easily. * I never ever push the bike, you could call it "babied", it sleeps inside a garage. Please give me some ideas, right now I have the following suspicions: * Bad power line to PC3 * Oxidization inside the plugs of the main harness. Quote Link to comment Share on other sites More sharing options...
The Krypt Keeper Posted July 1, 2013 Share Posted July 1, 2013 Lost engine power or all power including electric? Lights go out or dash blink out? Know you mention the trip meter not resetting but wondering about lights Quote Link to comment Share on other sites More sharing options...
dehning Posted July 1, 2013 Author Share Posted July 1, 2013 Lost engine power or all power including electric? Lights go out or dash blink out? Know you mention the trip meter not resetting but wondering about lights Only engine power for 1/2 a second, all other power stayed working fine. Dash didn't change. Quote Link to comment Share on other sites More sharing options...
ironmike Posted July 1, 2013 Share Posted July 1, 2013 Just a hunch... Check your vent lines for raw fuel - they should be dry. If not, the FPR diaphragm could be compromised (pin hole will sometimes manifest similar symptoms - at first... unfortunately, it'll only get worse). The good news is that it's an easy fix; just replace the FPR (on the right end of the fuel rail). Quote Link to comment Share on other sites More sharing options...
dehning Posted July 1, 2013 Author Share Posted July 1, 2013 Just a hunch... Check your vent lines for raw fuel - they should be dry. If not, the FPR diaphragm could be compromised (pin hole will sometimes manifest similar symptoms - at first... unfortunately, it'll only get worse). The good news is that it's an easy fix; just replace the FPR (on the right end of the fuel rail). Wow, and this would cause this VERY sporadic issue ? With all my playing with these things I don't think I've ever messed with an FPR. Quote Link to comment Share on other sites More sharing options...
slowrideCX Posted July 1, 2013 Share Posted July 1, 2013 I don't have a lot of experience with the FI bikes but lose of engine power only sounds like a fuel issue to me. Quote Link to comment Share on other sites More sharing options...
blackhawkxx Posted July 1, 2013 Share Posted July 1, 2013 Aliens? Sorry. I might try to remove seat and tail. With motor running, do the wiggle wire test everywhere I could. After that, I would be eyeing the Power Commander. Quote Link to comment Share on other sites More sharing options...
ironmike Posted July 2, 2013 Share Posted July 2, 2013 Just a hunch... Check your vent lines for raw fuel - they should be dry. If not, the FPR diaphragm could be compromised (pin hole will sometimes manifest similar symptoms - at first... unfortunately, it'll only get worse). The good news is that it's an easy fix; just replace the FPR (on the right end of the fuel rail). Wow, and this would cause this VERY sporadic issue ? With all my playing with these things I don't think I've ever messed with an FPR. It starts out as sporadic... but it can end up with a hydro-locked engine. Fuel leaks through the compromised FPR into the vent lines and then into the cylinders. That alone can hydro-lock a cylinder. Or even worse, it'll find its way past the rings and into the crankcase. It mixes with the oil - leak enough volume and it can hydro-lock the bottom end. It's one of the few things on a FI XX that may become a problem thanks to ethanol blended gasoline. It appears the FPR's diaphragm may be susceptible to deterioration when subjected to prolonged exposure to ethanol. It's happened to a number of folks on this board. OTOH, your Power Commander could be wonky... or both... shit happens. At least check the vent lines, if for no other reason than to eliminate the FPR as the problem. Quote Link to comment Share on other sites More sharing options...
dehning Posted July 2, 2013 Author Share Posted July 2, 2013 So is that FPR part number 16740-MAT-E22, or number 18 in this diagram: (Also, could somebody explain the mechanics of how fuel from a fuel pressure regulator ends up in a vent line ? They don't seem like they should be linked ?) Quote Link to comment Share on other sites More sharing options...
ironmike Posted July 3, 2013 Share Posted July 3, 2013 So is that FPR part number 16740-MAT-E22, or number 18 in this diagram: (Also, could somebody explain the mechanics of how fuel from a fuel pressure regulator ends up in a vent line ? They don't seem like they should be linked ?) Right! Part 18 is the FPR... There are two lines attached to the FPR. One, on the underside as you view it from the right side if the bike, is a vacuum (vent) tube on the outer cap of the FPR; the other is the (larger diameter) fuel return line that's located past the FPR's rim, aimed aft, and closer to the fuel rail. That (smaller diameter) vacuum line leads to a series of collateral lines that connect to the throats of the throttle bodies. In my shop manual ('99-2000), it's clearly depicted on page 5-62 (Throttle Body Vacuum Tube Routing). Of course the California bikes have additional vent/vacuum lines that connect to the EVAP purge control valve and the CARB mandated canister. I'm aware that after '99, there were some small changes - yours is an '02, so the vacuum line routing is a bit different. Maybe you didn't know we have a shop manual ('99-2002) available on this site... http://www.cbr1100xx.org/forums/index.php?showtopic=32678 It downloads as a PDF file. It's an extensive (146.32Mb) file so be patient. You'll need to see the diagrams on pages 5-72 and 5-73. If your vent/vacuum lines are internally dry your FPR is probably fine... if not, that is a problem you can nip in the bud. Quote Link to comment Share on other sites More sharing options...
jon haney Posted July 4, 2013 Share Posted July 4, 2013 I think it's the Power Commander. Dis-connect it from the system and ride it for a while. If the symptoms don't return............... Quote Link to comment Share on other sites More sharing options...
dehning Posted July 4, 2013 Author Share Posted July 4, 2013 OK I think I get the vacuum hoses, I will check for fuel in them. I'm not so sure of the PC3, seems too sporadic? Quote Link to comment Share on other sites More sharing options...
Hobicus Posted July 4, 2013 Share Posted July 4, 2013 OK I think I get the vacuum hoses, I will check for fuel in them. I'm not so sure of the PC3, seems too sporadic? Takes 3 minutes to disconnect the PC3 and take it out of the equation... why not do that first? It's possible that when it gets hot it has problems... a few seconds is probably all it needs to reboot itself. Yep.. check for bad ground/loose wiring. Also, check the bank angle sensor under the seat. Quote Link to comment Share on other sites More sharing options...
fourx Posted July 4, 2013 Share Posted July 4, 2013 Sounds like water problem to me? Happened twice in 4 months to me cost a fucken fortune. I don't go back to that servo new filters new plugs.water and efi dont mix Quote Link to comment Share on other sites More sharing options...
dehning Posted July 4, 2013 Author Share Posted July 4, 2013 I will check PC3 (It's a lot longer than 3 minutes to get to that plug though) I was riding smooth and flat so I don't think it's the angle sensor, I've had one of those go out and the problems are much more noticeable, not 3 misses in 20+ miles. Like I said in the original post, this is drought stricken Texas, bike hasn't seen water for months. Quote Link to comment Share on other sites More sharing options...
fourx Posted July 21, 2013 Share Posted July 21, 2013 So did you find the problem or not? Quote Link to comment Share on other sites More sharing options...
ironmike Posted July 30, 2013 Share Posted July 30, 2013 Yeah, any update? Don't leave us hanging... Quote Link to comment Share on other sites More sharing options...
BearXX Posted August 1, 2013 Share Posted August 1, 2013 Yeah, any update? Don't leave us hanging... +1 He might be too embarrassed to post up a reply Quote Link to comment Share on other sites More sharing options...
blackhawkxx Posted August 2, 2013 Share Posted August 2, 2013 He might be too embarrassed to post up a reply eusa_whistle.gifNa, he is just hesitating. Quote Link to comment Share on other sites More sharing options...
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