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weird ideling

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Old 04-12-12, 09:49 PM
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weird ideling
My S5 NA used to idel fine at 800rpm but now it randomly "surges" up and down from 1000 to 1500rpm. I havnt changdd anything and its stock 13b. Any help appreciated
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Old 04-12-12, 10:06 PM
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Might be a vacuum leak..check all the vacuum hoses
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Old 04-12-12, 10:11 PM
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Ok will check that out tomorrow before my rx7 meet, thanks
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Old 04-13-12, 06:03 PM
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let me know what your fix is...
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Old 04-13-12, 07:04 PM
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Couldn't find any vac leaks, so anymore suggestions? Lol
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Old 04-14-12, 01:37 AM
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Normally should be a vaccum leak somewhere or idk if your pressure sensor could cause that to happen.
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Old 04-14-12, 01:45 AM
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if its not a vac leak, afm?
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Old 04-14-12, 09:40 AM
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Could it be related to my TPS by any chance?
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Old 04-14-12, 09:42 AM
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Yes, it could.

How did you check for vacuum leaks?
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Old 04-14-12, 09:45 AM
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Because I'm pretty sure I got a bad TPS, I can't floor the gas pedal or my car bogs down, so I have to ease on the gas.
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Old 04-14-12, 09:47 AM
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Have you tried to... adjust it?
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Old 04-14-12, 11:33 AM
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Ya and nothing seems to work, I tryd adjusting it the way with a multimeter
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Old 04-14-12, 07:43 PM
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That could also be indication of a bad AFM. Check to see if the plunger moves smoothly. It seems that it's more of a problem with S4's with the flapper door, but the S5 works on the same principle.
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Old 04-14-12, 11:13 PM
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Ok, so I checked the AFM and it seems to be functioning properly
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Old 04-15-12, 07:31 AM
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You say that these things checked out, but how are you checking them? How are you searching for vacuum leaks, checking the TPS, how did you check the AFM?
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Old 04-15-12, 10:00 AM
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Pull Codes-See if you have issues with the MOP and limp mode.
http://www.1300cc.com/howto/how2/codes.html

The idle surging is likely TPS adjustment.
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Old 04-16-12, 02:32 PM
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Ok so according to that list of codes, its my throttle sensor (code #12)
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Old 04-16-12, 05:17 PM
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Green/Red wire set to 1 volt w/key to on and engine fully warmed.
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