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Tune and pcm relearn.

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Old 05-09-2012, 01:51 AM
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Default Tune and pcm relearn.

Aloha gang,
Curious about something, when a pcm is custum tuned, say HP tuner, is there still a relearn after the battery has been disconnected, or if someone gets a mail order tune, does the pcm have to learn the new tune when the pcm is put in, or is it just put in the mail order pcm and it is what it is?

Last edited by slammedc5; 05-09-2012 at 02:19 AM.
Old 05-09-2012, 09:30 AM
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for the most part it is what it is the pcm can learn some idle and fuel trims but only if it is tuned properly




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