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Cobra Forums
2015+ Shelby GT350 Mustang
2017 Shelby GT350 Start Up
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<blockquote data-quote="JAJ" data-source="post: 16324432" data-attributes="member: 131874"><p>So the way the valves work is this: the ECU cycles them on startup to make sure they're working. The controller motors on each one have a sensor that tells the ECU if the valve's moving or not. If "not" then it might lock you out of drive modes other than "normal" until you get it fixed. I say "might lock you out" because the original 2016 ECU software always locked you out, but newer ECU software will tolerate stuck valves on the assumption that it's cold, they've gotten wet and now they're frozen in place. There was a TSB on this. In any case, when they're working properly, if you start the car immediately when you push the clutch pedal down, you'll hear it start with the valves open. If you wait until the noise stops, it starts with the valves closed.</p><p></p><p>It sounds like you've got one or more stuck valves. </p><p></p><p>The trunk warning is a switch or a wiring harness problem and it's unrelated to the exhaust valves.</p></blockquote><p></p>
[QUOTE="JAJ, post: 16324432, member: 131874"] So the way the valves work is this: the ECU cycles them on startup to make sure they're working. The controller motors on each one have a sensor that tells the ECU if the valve's moving or not. If "not" then it might lock you out of drive modes other than "normal" until you get it fixed. I say "might lock you out" because the original 2016 ECU software always locked you out, but newer ECU software will tolerate stuck valves on the assumption that it's cold, they've gotten wet and now they're frozen in place. There was a TSB on this. In any case, when they're working properly, if you start the car immediately when you push the clutch pedal down, you'll hear it start with the valves open. If you wait until the noise stops, it starts with the valves closed. It sounds like you've got one or more stuck valves. The trunk warning is a switch or a wiring harness problem and it's unrelated to the exhaust valves. [/QUOTE]
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