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New Edge Cobras
Asking for some return help..
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<blockquote data-quote="mwolson" data-source="post: 13107570" data-attributes="member: 16006"><p>This is a strange one.</p><p></p><p>You normally have to leave the battery unplugged for several minutes to clear the KAM due to the large capacitor they have on the KAM power line inside of the PCM. But if you press the brakes while the battery is unhooked, the brake lights discharge that capacitor right away so you don't have to wait.</p><p></p><p>My first suspicion after reading this thread is some kind of EGR related problem since it is happening at part throttle. Can you datalog your EGR system to see if there are any glitches when the problem occurs?</p><p></p><p>Your fuel trims indicate that the MAF transfer function in the stock tune is off a little bit, but at idle and part throttle, your O2 sensors are keeping it under control, so no worries there. With a perfect MAF transfer function, the trims would be centered on 1.0.</p></blockquote><p></p>
[QUOTE="mwolson, post: 13107570, member: 16006"] This is a strange one. You normally have to leave the battery unplugged for several minutes to clear the KAM due to the large capacitor they have on the KAM power line inside of the PCM. But if you press the brakes while the battery is unhooked, the brake lights discharge that capacitor right away so you don't have to wait. My first suspicion after reading this thread is some kind of EGR related problem since it is happening at part throttle. Can you datalog your EGR system to see if there are any glitches when the problem occurs? Your fuel trims indicate that the MAF transfer function in the stock tune is off a little bit, but at idle and part throttle, your O2 sensors are keeping it under control, so no worries there. With a perfect MAF transfer function, the trims would be centered on 1.0. [/QUOTE]
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