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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine only runs with vacuum line disconnected
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<blockquote data-quote="road runner" data-source="post: 1447500" data-attributes="member: 5116"><p>All of your readings look normal. I don't think the Baro ready is not inches or mm of Hg. I think it is just a number sent to ECM that changes with baro then the ECM looks at a chart to come up with the proper settings. I'm pretty sure about this but not certain so it needs to be checked.</p><p></p><p>Did you erase the old fault codes (after you document them) then see what new ones come back?</p><p></p><p>I still think it is too lean. Things that affect the mixture the most are Air and coolant temp sensors, MAP sensor, FP regulator, and fuel pressure. </p><p></p><p>You could try unhooking the MAP and temp sensors and see if it runs better. That should put it in limp home mode. If that does not do it then you need to check fuel pressure (FP). You may have a stuck injector. </p><p></p><p>I'm not familiar with the Gen1 fuel system. I think it has a 2 fuel lines or a return. My Gen 2 has one fuel line. If it has a return, you could try pinching the return to restrict it and raise the FP. See if you can act like a FP regulator. I have done this on other things, but you should have a FP gage on it so you can see what is going on.</p><p></p><p>Just some ideas. I'm not a Yamaha FJR tech, but I did stay at a Holiday Inn Express once. lol.</p></blockquote><p></p>
[QUOTE="road runner, post: 1447500, member: 5116"] All of your readings look normal. I don't think the Baro ready is not inches or mm of Hg. I think it is just a number sent to ECM that changes with baro then the ECM looks at a chart to come up with the proper settings. I'm pretty sure about this but not certain so it needs to be checked. Did you erase the old fault codes (after you document them) then see what new ones come back? I still think it is too lean. Things that affect the mixture the most are Air and coolant temp sensors, MAP sensor, FP regulator, and fuel pressure. You could try unhooking the MAP and temp sensors and see if it runs better. That should put it in limp home mode. If that does not do it then you need to check fuel pressure (FP). You may have a stuck injector. I'm not familiar with the Gen1 fuel system. I think it has a 2 fuel lines or a return. My Gen 2 has one fuel line. If it has a return, you could try pinching the return to restrict it and raise the FP. See if you can act like a FP regulator. I have done this on other things, but you should have a FP gage on it so you can see what is going on. Just some ideas. I'm not a Yamaha FJR tech, but I did stay at a Holiday Inn Express once. lol. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine only runs with vacuum line disconnected
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