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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: 1447490" data-attributes="member: 98038"><p>First, Thank you all for the input. It is much appreciated. </p><p>I took off all the vacuum lines attached around the fuel rail and cleaned and inspected - no leaks or blockage.</p><p>Regarding Torch's diagnostics:</p><p>01 throttle position sensor - bike read 16 - 100 closed to open and moves smoothly</p><p>02 Atmos pressure - bike read 97 - barometer 29.91 inHg, 759.81 mmHg Huge difference here or is the decimal place off on the bike?</p><p>03 Pressure Difference - Engine off = 0 Engine turning on starter motor with my hand over air intake = 7</p><p>05 Intake air temp - Bike read 35 Ambient 30C</p><p>06 Coolant temp - Bike read 34 Ambient 30C (note my thermometer may not be the most accurate)</p><p></p><p>I have not done the fuel pressure tests as it looks like #02 and #03 readings are way off. I did the test on 8-57 of the shop manual. The voltage across the blue and black blue lines reads 5.2 with the key on. Spec is 3.75-4.25 Does this indicate that the sensor is bad? Can I do further tests to check these units. Now the bike is showing a check engine code of 14 instead of 16 which was the earlier fault Both have to do with the pressure sensor. I did not check the one under the seat. A bit of work to get to.</p><p>Ideas</p></blockquote><p></p>
[QUOTE="Zpetrus, post: 1447490, member: 98038"] First, Thank you all for the input. It is much appreciated. I took off all the vacuum lines attached around the fuel rail and cleaned and inspected - no leaks or blockage. Regarding Torch's diagnostics: 01 throttle position sensor - bike read 16 - 100 closed to open and moves smoothly 02 Atmos pressure - bike read 97 - barometer 29.91 inHg, 759.81 mmHg Huge difference here or is the decimal place off on the bike? 03 Pressure Difference - Engine off = 0 Engine turning on starter motor with my hand over air intake = 7 05 Intake air temp - Bike read 35 Ambient 30C 06 Coolant temp - Bike read 34 Ambient 30C (note my thermometer may not be the most accurate) I have not done the fuel pressure tests as it looks like #02 and #03 readings are way off. I did the test on 8-57 of the shop manual. The voltage across the blue and black blue lines reads 5.2 with the key on. Spec is 3.75-4.25 Does this indicate that the sensor is bad? Can I do further tests to check these units. Now the bike is showing a check engine code of 14 instead of 16 which was the earlier fault Both have to do with the pressure sensor. I did not check the one under the seat. A bit of work to get to. Ideas [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine only runs with vacuum line disconnected
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