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FJR Motorcycle Forums
Technical & Mechanical Problems
Any FI Experts Out There?
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<blockquote data-quote="Constant Mesh" data-source="post: 16427" data-attributes="member: 615"><p>The FJR has two air pressure sensors:</p><p></p><p>Intake air pressure sensor</p><p></p><p>Atmospheric pressure sensor</p><p></p><p>Is this intake air sensor a MAP sensor or is it measuring the intake air vacuum?</p><p></p><p>I assume when the key switch is on before the engine is started that both sensors would give the same pressure reading. Or maybe one is reading zero vacuum and the other the atmospheric pressure.</p><p></p><p>I've noticed on the Honda ST1300 that it has a MAP sensor but doesn't have an atmospheric pressure sensor -- it isn't shown on the electrical schematic. I've seen on a ST1300 forum some grumblings from riders that their bikes run poorly at higher altitudes -- particularly their idle rpm is erratic at higher elevations. Might the absence of an atmospheric pressure sensor cause this?</p><p></p><p>From the service manual of a 1992 Honda Prelude I once owned I noticed it had a MAP sensor but no atmospheric pressure sensor. But, when I looked a little closer I discovered that it did have an atmospheric sensor that was part of the ECM unit and not an external sensor with wiring to the ECM.</p></blockquote><p></p>
[QUOTE="Constant Mesh, post: 16427, member: 615"] The FJR has two air pressure sensors: Intake air pressure sensor Atmospheric pressure sensor Is this intake air sensor a MAP sensor or is it measuring the intake air vacuum? I assume when the key switch is on before the engine is started that both sensors would give the same pressure reading. Or maybe one is reading zero vacuum and the other the atmospheric pressure. I've noticed on the Honda ST1300 that it has a MAP sensor but doesn't have an atmospheric pressure sensor -- it isn't shown on the electrical schematic. I've seen on a ST1300 forum some grumblings from riders that their bikes run poorly at higher altitudes -- particularly their idle rpm is erratic at higher elevations. Might the absence of an atmospheric pressure sensor cause this? From the service manual of a 1992 Honda Prelude I once owned I noticed it had a MAP sensor but no atmospheric pressure sensor. But, when I looked a little closer I discovered that it did have an atmospheric sensor that was part of the ECM unit and not an external sensor with wiring to the ECM. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Any FI Experts Out There?
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