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SN95 Cobras
Idle Problem
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<blockquote data-quote="mwolson" data-source="post: 11078419" data-attributes="member: 16006"><p>Per my SCT dealer training, a better way is to tweak the TB idle stop screw until your ISC_Duty_Cycle is about 35%. Then you tweak the IAC transfer function until the ISC integrator is running around 0. At that point, the PCM will be able to control the idle, assuming you have no other mechanical problems.</p><p></p><p>The PCM needs to have anough range in IACV duty cycle to go where it needs to go.</p><p></p><p>FYI, the PCM only does coarse control of idle with the IACV. It does fine control of idle with spark. (Make sure the spark source is a steady 9 at idle.)</p><p></p><p>I haven't run across a 96+ car that hasn't worked well with this process, unless there were other problems, such as vacuum leaks, or bad IACVs.</p><p></p><p>That said, I haven't worked with a lot of aftermarket TBs. The stock TBs have all done well with this process.</p><p></p><p>But if your process works too, then that is cool.</p></blockquote><p></p>
[QUOTE="mwolson, post: 11078419, member: 16006"] Per my SCT dealer training, a better way is to tweak the TB idle stop screw until your ISC_Duty_Cycle is about 35%. Then you tweak the IAC transfer function until the ISC integrator is running around 0. At that point, the PCM will be able to control the idle, assuming you have no other mechanical problems. The PCM needs to have anough range in IACV duty cycle to go where it needs to go. FYI, the PCM only does coarse control of idle with the IACV. It does fine control of idle with spark. (Make sure the spark source is a steady 9 at idle.) I haven't run across a 96+ car that hasn't worked well with this process, unless there were other problems, such as vacuum leaks, or bad IACVs. That said, I haven't worked with a lot of aftermarket TBs. The stock TBs have all done well with this process. But if your process works too, then that is cool. [/QUOTE]
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