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Old 08-05-2015, 01:48 PM   #1
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Rpm needle moving around at idle

2013 gt mt82 junk....recently my Rpm needle been moving around at idle...not much bit enough to notice ...anyone have this issue and is it a problem? When I'm idling around 700-750 it will dip down. To 600ish then back up.. and when not dipping down it moves between 700-750 constantly. ..any help I would greatly appreciate
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Old 08-05-2015, 02:25 PM   #2
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Quote:
Originally Posted by Jstorm View Post
2013 gt mt82 junk....recently my Rpm needle been moving around at idle...not much bit enough to notice ...anyone have this issue and is it a problem? When I'm idling around 700-750 it will dip down. To 600ish then back up.. and when not dipping down it moves between 700-750 constantly. ..any help I would greatly appreciate
Have you messed around with any vacuum lines lately? Typically a dancing idle is indicative of a vacuum leak. If you have a datalogger, hook it up at idle and see what your short term fuel trims are doing.

Also not sure why you mentioned the transmission because that has literally nothing to do with your issue?
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Old 08-05-2015, 02:25 PM   #3
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AC kicking on? I know they try and idle as low as possible (mpg)
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Old 08-05-2015, 02:26 PM   #4
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Ac on or off it does it ....mentioned trans just because. No vacumm lines messed with sinew the boss intake install. 4 months ago....just started this recently
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Old 08-05-2015, 10:52 PM   #5
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Voltwings is correct, do you have a data logger?
Also could be an intake leak/vacuum, causing the jumping needle.
The AC should make no difference..........at least on mine it doesn't.....with the AC on it should hold a slightly faster idle than normal....................mine normally idles 700 and with the AC it's above 700.
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