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vacuum leaks

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Old 12-25-2011, 12:04 PM
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vacuum leaks

do vacuum leaks cause high or low idle condition?
Old 12-25-2011, 12:12 PM
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I suppose either, but vacuum leaks I've tracked down are 90%+ low idle.
Old 12-25-2011, 08:12 PM
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If your vehicle uses a MAP sensor a vaccuum leak will raise the idle .
If your vehicle uses a carburetor, AFM or MAF sensor a vaccuum leak will lower the idle.
AFM sensored vehicles [22RE and 3VZE have it] are especially sensitive to vaccuum leaks.
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