IAC reading over OBD-II?
11-24-2009, 08:37 AM
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Staging Lane
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IAC reading over OBD-II? Okay, not really a tuning related question, but kinda PCM related 
.
Anyway, few things about my car. One, my idle tends to hang a bit when I take it outta gear and come to a stop. Two, my LTFTs are always positive...like maybe ~5 idleing, and even 7 to 9 on the highway. Three, the IAC value as read over OBD-II is always 0.
Now, I haven't exactly been watching the IAC value as closely as I've been wathcing my fuel trims, etc (because I dont really know what the value represents). But I am now lead to beleive that this shouldn't be 0, and that it being zero may indicate a vacuum leak. Correct?
What should the value be typically? ...while the engine is warming up? ...while driving? ...while idleing?
Any help is appreciated
.Anyway, few things about my car. One, my idle tends to hang a bit when I take it outta gear and come to a stop. Two, my LTFTs are always positive...like maybe ~5 idleing, and even 7 to 9 on the highway. Three, the IAC value as read over OBD-II is always 0.
Now, I haven't exactly been watching the IAC value as closely as I've been wathcing my fuel trims, etc (because I dont really know what the value represents). But I am now lead to beleive that this shouldn't be 0, and that it being zero may indicate a vacuum leak. Correct?
What should the value be typically? ...while the engine is warming up? ...while driving? ...while idleing?
Any help is appreciated
Last edited by tecmec; 11-24-2009 at 08:44 AM.
11-24-2009, 09:05 PM
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It could be showing a vacuum leak, but IAC ought to
show values other than zero when you are cruising and
at startup. If it's -always- zero, that seems more like a
scan tool problem to me.
show values other than zero when you are cruising and
at startup. If it's -always- zero, that seems more like a
scan tool problem to me.