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FJR Motorcycle Forums
Technical & Mechanical Problems
WTF is this noise?
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<blockquote data-quote="ionbeam" data-source="post: 351643" data-attributes="member: 277"><p>The TPS is a definite possibility for your symptoms and since it is fairly easy to check you may want to verify it first. Stalling is a classic symptom of a TPS failure as well as vacuum leaks. Typically, a vacuum leak will also be associated with an elevated idle speed. It is important to use the TPS Black/Blue wire for ground and the Yellow for the positive meter connections, never use the frame or battery for the ground connection. Monitor the Yellow wire voltage when experiencing the noise & rpm change. The voltage should be stable out to .01 volts. If the Yellow wire voltage fluctuates more than .1 volts you are looking at a TPS problem.</p><p></p><p>If the problem looks like the cam chain tensioner most shops will wait for you to leave and then repeatedly whack the throttle fully open/closed until the tensioner takes up another ratchet click. Crude but effective as long as all the tensioner components are all sound.</p><p></p><p>Edited: To add, that a bad TPS can cause you to feel a mechanical roughness. The ECU will set totally unappropriate FI shots if the TPS returns a false position signal, resulting in a really rough engine.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 351643, member: 277"] The TPS is a definite possibility for your symptoms and since it is fairly easy to check you may want to verify it first. Stalling is a classic symptom of a TPS failure as well as vacuum leaks. Typically, a vacuum leak will also be associated with an elevated idle speed. It is important to use the TPS Black/Blue wire for ground and the Yellow for the positive meter connections, never use the frame or battery for the ground connection. Monitor the Yellow wire voltage when experiencing the noise & rpm change. The voltage should be stable out to .01 volts. If the Yellow wire voltage fluctuates more than .1 volts you are looking at a TPS problem. If the problem looks like the cam chain tensioner most shops will wait for you to leave and then repeatedly whack the throttle fully open/closed until the tensioner takes up another ratchet click. Crude but effective as long as all the tensioner components are all sound. Edited: To add, that a bad TPS can cause you to feel a mechanical roughness. The ECU will set totally unappropriate FI shots if the TPS returns a false position signal, resulting in a really rough engine. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
WTF is this noise?
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