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SN95 Cobras
Troublesome Trouble Codes... P0171
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<blockquote data-quote="mwolson" data-source="post: 6389585" data-attributes="member: 16006"><p>The codes will only get triggered when the car is running in closed loop because it happens when the learned fuel trims pass a pre-programmed threshold. The car runs in open loop for a couple of minutes (a bit longer when cold) on starting, and at WOT, for example. But during normal driving, it runs in closed loop, always learning the typical adjustment required from the O2 sensors. That is when your codes will usually be thrown.</p><p></p><p>The PCM compensates for IATs, so that should not be the root cause of the lean condition.</p><p></p><p>That said, the less hot air you can pull in from the engine compartment, the better your car will run. Pulling the snorkel could make it easier for hot engine compartment air to get in, but I never liked the stock air box with or without the snorkel. I prefer a system that has less room for hot air to come in. Unfortunately, the Volant CAI I use is no longer available for our cars.</p></blockquote><p></p>
[QUOTE="mwolson, post: 6389585, member: 16006"] The codes will only get triggered when the car is running in closed loop because it happens when the learned fuel trims pass a pre-programmed threshold. The car runs in open loop for a couple of minutes (a bit longer when cold) on starting, and at WOT, for example. But during normal driving, it runs in closed loop, always learning the typical adjustment required from the O2 sensors. That is when your codes will usually be thrown. The PCM compensates for IATs, so that should not be the root cause of the lean condition. That said, the less hot air you can pull in from the engine compartment, the better your car will run. Pulling the snorkel could make it easier for hot engine compartment air to get in, but I never liked the stock air box with or without the snorkel. I prefer a system that has less room for hot air to come in. Unfortunately, the Volant CAI I use is no longer available for our cars. [/QUOTE]
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Troublesome Trouble Codes... P0171
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