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Old 11-07-2009, 02:04 AM   #13 (permalink)
 fretburnr 
Heel + Toe Hero
 
Join Date: May 2004
Location: Downers Grove
Posts: 1,790

Car: 1991 Toyota MR2 Turbo

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Not necessarily. A big monster one will tend to stall the engine, unless the engine management steps in heavily to boost idle. Little ones can go either way - if the computer "corrects" by boosting idle, then it gets raised; otherwise, the extra unmetered air being ingested moves the idle off of stoich mixture and idle drops.

I know what you're saying, though - many cars, idle will dip and then raise when a little vac leak is introduced.
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