Rpm surging when at idle
2015 Mitsubishi Outlander Sport

RPM surging when at idle

(2015 Mitsubishi Outlander Sport)
Whenever I am at a stop light or stop sign and I'm at idle. My RPM will drop to below 500 then jump up to 800 or 900. And this will continue over and over until I start moving forward. I've noticed that if I turn of the AC it will help most of the time. And sometimes it helps if I put it in park. And if I have it in park with the AC off, no surging down and up. So does it have something to do with the AC?
What seems to make the problem better or worse? When I turn off the AC, it helps most of the time
How long have you had this problem? A few weeks
Tags: mitsubishi, outlander sport, rpm, idling, ac
2 answers & 0 comments
Popular Answer
on May 27, 2019

Coolant level MUST BE *FULL*..

Crazy ain’t it...
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General Diagnosis
$88 - $111 Learn More
on May 27, 2019

Coolant level MUST BE *FULL*..

Crazy ain’t it...
Sign in to reply
on May 27, 2019
This could be a vacuum leak or an issue with the throttle body, tps, etc. A scanner is needed to start. I'd check coded and o2 sensor values.
Also look around for disconnected vacuum lines or hoses.

Alex
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