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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine only runs with vacuum line disconnected
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<blockquote data-quote="RossKean" data-source="post: 1447339" data-attributes="member: 19880"><p>Clean the stuff up and go from there. What is the other pressure sensor?</p><p>TPS has been known to go bad on Gen I but not to the point where it prevents any running. Have you done any of the diagnostics for the TPS?</p><p>The pressure sensor I referenced in my first post (or associated electrical connections/hoses/plastic connectors) seems to me to be most probable...</p><p></p><p>Edit: I just reread your original post and it clicked that the the bike only has 4900 miles! Also that it hasn't run in 16 years!</p><p>Makes it more likely to be electrical in nature. I would check, clean and use dielectric grease on every connector. There is one that has been problematic on some Gen I - big white connector under the tank:</p><p>[URL unfurl="true"]https://www.fjrforum.com/threads/main-ecu-connector-contamination.22734/[/URL]</p><p>Have a close look at the connector (and wiring) that goes to the ECU as well.</p><p></p><p>Still very much worthwhile looking at the pressure sensor stuff. Blockage or crack in that system will cause problems (as will a bad sensor).</p><p>TPS seems less likely. Although there were some failures in Gen I, I believe they were wear related. Not likely at 4900 miles unless moisture got in. Bike diagnostics should be able to eliminate the TPS - at least I know you can verify on Gen II.</p><p></p><p>Hope there isn't hidden rodent damage!</p></blockquote><p></p>
[QUOTE="RossKean, post: 1447339, member: 19880"] Clean the stuff up and go from there. What is the other pressure sensor? TPS has been known to go bad on Gen I but not to the point where it prevents any running. Have you done any of the diagnostics for the TPS? The pressure sensor I referenced in my first post (or associated electrical connections/hoses/plastic connectors) seems to me to be most probable... Edit: I just reread your original post and it clicked that the the bike only has 4900 miles! Also that it hasn't run in 16 years! Makes it more likely to be electrical in nature. I would check, clean and use dielectric grease on every connector. There is one that has been problematic on some Gen I - big white connector under the tank: [URL unfurl="true"]https://www.fjrforum.com/threads/main-ecu-connector-contamination.22734/[/URL] Have a close look at the connector (and wiring) that goes to the ECU as well. Still very much worthwhile looking at the pressure sensor stuff. Blockage or crack in that system will cause problems (as will a bad sensor). TPS seems less likely. Although there were some failures in Gen I, I believe they were wear related. Not likely at 4900 miles unless moisture got in. Bike diagnostics should be able to eliminate the TPS - at least I know you can verify on Gen II. Hope there isn't hidden rodent damage! [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine only runs with vacuum line disconnected
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