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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine only runs with vacuum line disconnected
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<blockquote data-quote="Zpetrus" data-source="post: 1447312" data-attributes="member: 98038"><p>Hello All,</p><p>I aquired a 2005 fjr that has not run since 2006. 4,900 miles. After kicking out the mice and cleaning her up and looking at the wiring harness for damage - minimal </p><p>I replaced:</p><p>Battery</p><p>fuel pump</p><p>fuel injectors</p><p>air filter</p><p>spark plugs</p><p>oil</p><p>cleaned out gas tank & lines and fuel rail - throttle bodies looked clean - boots to rail & bodies look good</p><p>new gas</p><p>now the engine turns over fine and "pops" while the starter is engaged and stops when the starter stops.</p><p>Runs on starter fluid. Strong spark on all cylinders</p><p>Started looking harder at the vacuum lines and found that the engine starts, runs, and revs (though a bit not rough, but not smooth) with the vacuum line disconnected from the fuel pressure regulator. It stops running if I reconnect the vacuum line or plug it with my finger. I now have an intermittent check engine code 16. Intake air pressure sensor, atmospheric pressure sensor, throttle position sensor. Do any of you more experienced folks know where I might start looking for a fault and how to check these components without just throwing parts at it? Why would an obvious vacuum leak allow the engine to run? It does not seem to matter where a vacuum line is disconnected (within reason). Any insight would be appreciated. Thanks in advance.</p></blockquote><p></p>
[QUOTE="Zpetrus, post: 1447312, member: 98038"] Hello All, I aquired a 2005 fjr that has not run since 2006. 4,900 miles. After kicking out the mice and cleaning her up and looking at the wiring harness for damage - minimal I replaced: Battery fuel pump fuel injectors air filter spark plugs oil cleaned out gas tank & lines and fuel rail - throttle bodies looked clean - boots to rail & bodies look good new gas now the engine turns over fine and "pops" while the starter is engaged and stops when the starter stops. Runs on starter fluid. Strong spark on all cylinders Started looking harder at the vacuum lines and found that the engine starts, runs, and revs (though a bit not rough, but not smooth) with the vacuum line disconnected from the fuel pressure regulator. It stops running if I reconnect the vacuum line or plug it with my finger. I now have an intermittent check engine code 16. Intake air pressure sensor, atmospheric pressure sensor, throttle position sensor. Do any of you more experienced folks know where I might start looking for a fault and how to check these components without just throwing parts at it? Why would an obvious vacuum leak allow the engine to run? It does not seem to matter where a vacuum line is disconnected (within reason). Any insight would be appreciated. Thanks in advance. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine only runs with vacuum line disconnected
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