High and fluctuating idle

[MartinW]

Hi all.

New to 350z's and this forum, I'll do an intro post when I'm a bit less busy at the weekend but I just wanted seek some advice quickly.

 

The car idles at about 1500rpm and often fluctuates up to about 1800. Based on a quick search this seems high and obviously the fluctuating isn't really normal.

 

Are there any simple things I can try here for myself before I get a professional to look at it?

 

Cheers

Martin

[Jack94]

Welcome. I'd give these a try first, could be just the butterfly valve in the throttle body just needs reseting-

https://h-dev.co.uk/350z-reset-proceedure-pedal-dance/?v=79cba1185463

[MartinW]

Thanks, gonna give this a try tomorrow. I've not even had the car a week and after driving it around a bit more today it seems that starting it cold it revs at about 1000rpm then after it's warmed up and I stop at lights etc it revs high at about 1500 and starts to fluctuate a lot. Maybe that's why I didn't notice it on my short test drive.

If it doesn't help I will have some words with the Dodgy 2nd hand car dealership and see if I can get them to sort it

[MartinW]

Tried the pedal dance with no luck

Checked for air leaks and it seemed ok, cleaned the mass airflow sensors and sprayed some other cleaner (erg) I think up through the throttle body when the engine was running, then re-did the pedal dance... No luck.

 

This article describes my issue, maybe I need a new ECU https://h-dev.co.uk/2016/08/18/350z-hr-vq35hr-high-idle-fix/?v=79cba1185463

Will be taking it to a mechanic