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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: 1447336" data-attributes="member: 19880"><p>Don't put too much stock in the appearance of a plug. Unless you ran the engine until it had warmed up and came off fast idle, I would expect it to be dark.</p><p></p><p>Before you consider replacing the pressure sensor, check its electrical connections, the orifice where the rubber tube connects as well as all of the associated plumbing, hoses and connectors for blockage and cracks. The lines and connectors can be spritzed with a suitable solvent (and dried before reconnection). I used a metal rod through the hoses after removing them followed by a pipe cleaner and then some solvent - carb cleaner IIRC. Note: Carb cleaner may damage plastic bits and cause rubber to swell if in contact too long. Mineral spirits might be a better idea although they take longer to evaporate. Don't put <strong>anything</strong> (solvent or implement to attempt to clean it out) into the sensor itself. </p><p></p><p>Make sure that the throttle synch caps are all present and accounted for but I doubt a missing or cracked cap would have this much effect.</p><p></p><p>Not saying it is the sensor, but it seems to be a significant possibility. Are there any stored error codes?</p></blockquote><p></p>
[QUOTE="RossKean, post: 1447336, member: 19880"] Don't put too much stock in the appearance of a plug. Unless you ran the engine until it had warmed up and came off fast idle, I would expect it to be dark. Before you consider replacing the pressure sensor, check its electrical connections, the orifice where the rubber tube connects as well as all of the associated plumbing, hoses and connectors for blockage and cracks. The lines and connectors can be spritzed with a suitable solvent (and dried before reconnection). I used a metal rod through the hoses after removing them followed by a pipe cleaner and then some solvent - carb cleaner IIRC. Note: Carb cleaner may damage plastic bits and cause rubber to swell if in contact too long. Mineral spirits might be a better idea although they take longer to evaporate. Don't put [B]anything[/B] (solvent or implement to attempt to clean it out) into the sensor itself. Make sure that the throttle synch caps are all present and accounted for but I doubt a missing or cracked cap would have this much effect. Not saying it is the sensor, but it seems to be a significant possibility. Are there any stored error codes? [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine only runs with vacuum line disconnected
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