350z high idle issue

[Ryan Jones]

I have noticed that my 06 350z is idling a bit high at around 950-1k when warm if I am stopped waiting at lights ect. I have just left it for a bit but then the other day I switched the car off and back on a again once it was warm while I was waiting at the lights and the idle goes back down to 650-750rpm and stays like that for the rest of the drive which I would consider a more normal idle speed. There is no engine light on at the moment and I have tried the pedal dance before. I think it helped in that past a bit but still doing it now.

 

any advice?

I do have a code reader but have lost the charger so I’ll try to find that to see if anything comes up on it but like I say there is no current engine light showing.

[mr v6]

Have you tried a thorough clean of the throttle body followed by all the 3 resets? I did that a few years ago & since then mine has been rock steady at 650rpm when fully warmed up.

[Ryan Jones]

I have not yet but It seems I need to start with this. What did you use to clean it with? I’m assuming there must be throttle body cleaners like carb cleaners for example. 

[mr v6]

I just used plenty of carb cleaner. I opened the throttle body & gave the whole inside a good clean, along with the edge of the butterfly valve, then do the resets, that may take you numerous attempts as they can be tricky.

[Ryan Jones]

Throttle body was cleaned a few weeks ago and did the resets. So far so good after a few weeks so seems to of sorted it with a normal idle of 600-650 now.