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FJR Motorcycle Forums
Technical & Mechanical Problems
2007 Stumbling on acceleration
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<blockquote data-quote="Wingman" data-source="post: 243546" data-attributes="member: 4328"><p>Items 3 and 4 get my attention as a possible cause for the stumble/surge condition. I would be interested in knowing exactly how this sensor works. I just don't understand how a single sensor can read both intake manifold pressure and barometric (ambient) pressure. Anyone out there with a 2007 service manual care to chime in?</p><p></p><p>The following is just speculation, but. . .</p><p></p><p>IF the sensor uses some mechanical means to switch from ambient to manifold input to the sensor, a delay in switching between the two could cause the sensor to basically lie to the ecm. The ecm could then tell the injectors to send way too much or way too little fuel to the engine. Too much fuel wouldn't be a big issue, but could cause drivability problems under some circumstances. However, too little fuel would definitely be bad because these bikes are already running very lean to start with.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="Wingman, post: 243546, member: 4328"] Items 3 and 4 get my attention as a possible cause for the stumble/surge condition. I would be interested in knowing exactly how this sensor works. I just don't understand how a single sensor can read both intake manifold pressure and barometric (ambient) pressure. Anyone out there with a 2007 service manual care to chime in? The following is just speculation, but. . . IF the sensor uses some mechanical means to switch from ambient to manifold input to the sensor, a delay in switching between the two could cause the sensor to basically lie to the ecm. The ecm could then tell the injectors to send way too much or way too little fuel to the engine. Too much fuel wouldn't be a big issue, but could cause drivability problems under some circumstances. However, too little fuel would definitely be bad because these bikes are already running very lean to start with. David [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
2007 Stumbling on acceleration
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