ski.dive Posted June 24, 2018 Share Posted June 24, 2018 (edited) AT IDLE- I'm having Fluctuating RPM's from 625 to 825 What is causing the up and down of RPM's? Edited June 24, 2018 by ski.dive (see edit history) Link to comment Share on other sites More sharing options...
DAVES89 Posted June 24, 2018 Share Posted June 24, 2018 Welcome to the club. Sometimes mine idles at 650 or so then others at 850 or so. Never got excited about it, I just let it go... Link to comment Share on other sites More sharing options...
tony1970 Posted June 24, 2018 Share Posted June 24, 2018 HI could be a bad o2 sensor should be replaced at 50k no matter what.,also a bad mass air flow meter,or dirty wire with in meter. Link to comment Share on other sites More sharing options...
waltmail Posted June 24, 2018 Share Posted June 24, 2018 Throttle Position Sensor ???????????? Link to comment Share on other sites More sharing options...
Digger914 Posted June 25, 2018 Share Posted June 25, 2018 On 6/24/2018 at 9:28 AM, ski.dive said: AT IDLE- I'm having Fluctuating RPM's from 625 to 825 What is causing the up and down of RPM's? If your idle speed is surging between these two numbers giving the throttle body a good cleaning is the first best fix, pay special attention to the port for the idle air motor. If your idle speed is steady while sitting but changes this much between stop signs, a good throttle body cleaning is still your first best fix. Wouldn't hurt to shop the internet for best price on idle air motor and throttle position sensor just in case. Link to comment Share on other sites More sharing options...
2seater Posted June 25, 2018 Share Posted June 25, 2018 The first thing(s) I would look at is the diagnostics for such things as the TPS, IAC and maybe the MAF. Watch the readings while it is acting up to see if they keep moving around with no other input and it may help narrow things. Link to comment Share on other sites More sharing options...
D-a-n-i-e-l Posted June 27, 2018 Share Posted June 27, 2018 Sweet we have not solved it. How about we ask for all the readings at idle and all quarter throttle positions. Then maybe something might stand out. Link to comment Share on other sites More sharing options...
padgett Posted June 27, 2018 Share Posted June 27, 2018 Try this. 1 Link to comment Share on other sites More sharing options...
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