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SVT Shelby GT500
O2 Heater Questions
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<blockquote data-quote="briangsxr1000" data-source="post: 16941871" data-attributes="member: 149707"><p>I have an 07 that's not heating up my sensors fast enough with LT headers which gives me a poor idle until the sensors get hot. </p><p>I've done A TON of diagnostics. Also replaced the PCM which made no difference. I have no codes.</p><p></p><p>The issue is the PCM is only commanding 50% duty cycle and that's typically what it would do to maintain temp, not increase it from cold. </p><p></p><p>Does anyone know how the PCM decides what duty cycle is appropriate for the PWM supply to the O2 heaters? </p><p></p><p>Does it look at coolant or cyl head temp? Does it always just run 100% DC on any startup until going into closed loop?</p></blockquote><p></p>
[QUOTE="briangsxr1000, post: 16941871, member: 149707"] I have an 07 that's not heating up my sensors fast enough with LT headers which gives me a poor idle until the sensors get hot. I've done A TON of diagnostics. Also replaced the PCM which made no difference. I have no codes. The issue is the PCM is only commanding 50% duty cycle and that's typically what it would do to maintain temp, not increase it from cold. Does anyone know how the PCM decides what duty cycle is appropriate for the PWM supply to the O2 heaters? Does it look at coolant or cyl head temp? Does it always just run 100% DC on any startup until going into closed loop? [/QUOTE]
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