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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: 1447322" data-attributes="member: 5116"><p>Sounds like it needs more fuel to run. By unhooking a vacuum line anywhere, the MAP sensor see's low vacuum and thinks the engine is at WOT, so it tells the ECM to richen it up by holding the injectors open longer. Test this by just taking the vacuum line off the MAP sensor and see if it runs. Then plug the line and it should still run if it's related to the MAP and running lean.</p><p></p><p>Don't know yet but something to try. This will just tell if it wants more fuel.</p></blockquote><p></p>
[QUOTE="road runner, post: 1447322, member: 5116"] Sounds like it needs more fuel to run. By unhooking a vacuum line anywhere, the MAP sensor see's low vacuum and thinks the engine is at WOT, so it tells the ECM to richen it up by holding the injectors open longer. Test this by just taking the vacuum line off the MAP sensor and see if it runs. Then plug the line and it should still run if it's related to the MAP and running lean. Don't know yet but something to try. This will just tell if it wants more fuel. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine only runs with vacuum line disconnected
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