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SVT Shelby GT500
A/F issue
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<blockquote data-quote="SCGallo2" data-source="post: 16098439" data-attributes="member: 160791"><p>I have seen a similar AFR indication from an engine cold start while in open loop fueling. A momentary spike to 16 would not concern me in this situation at idle and not under load. Does your engine stumble when AFR indicates 16? Your tuner can adjust open loop fueling tables if it is causing driveability issues until your engine gets up to normal operating temperature and transitions to closed loop fueling. You would need to capture the event in a datalog and forward it to your tuner, or allow your tuner to "drive" tune your car, if possible. It sounds like your normal closed loop fueling and open loop fueling at wide open throttle are where they should be.</p><p></p><p>Edit: I am assuming you are running an unleaded gasoline fuel equivalent to 91-100 octane.</p></blockquote><p></p>
[QUOTE="SCGallo2, post: 16098439, member: 160791"] I have seen a similar AFR indication from an engine cold start while in open loop fueling. A momentary spike to 16 would not concern me in this situation at idle and not under load. Does your engine stumble when AFR indicates 16? Your tuner can adjust open loop fueling tables if it is causing driveability issues until your engine gets up to normal operating temperature and transitions to closed loop fueling. You would need to capture the event in a datalog and forward it to your tuner, or allow your tuner to "drive" tune your car, if possible. It sounds like your normal closed loop fueling and open loop fueling at wide open throttle are where they should be. Edit: I am assuming you are running an unleaded gasoline fuel equivalent to 91-100 octane. [/QUOTE]
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A/F issue
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