Idle drop after service TB?

[J Harris]

Had the 350z garaged over winter, need to get it back out now the suns come out. Come to service it this weekend with new plugs, engine/gearbox/diff oil, clutch fluid etc

Started up OK with a charge to the battery but now the idle drops every 30 seconds or so almost to a stall...

 

I've tried searching to find a reason and think it may be due to cleaning the throttle body whilst I had the air filter all off.

Im pretty sure i moved the butterfly valve manually but since seen this is a no no.

 

Can manually moving the butterfly valve cause this issue and how so?

[Olly350z]

Try unplugging the battery and leaving it at least 20 minutes to completely dissipate the charge. Hopefully upon reconnecting and starting the ECU will relearn throttle position

[slipstream]

I did the same, I moved my butterfly and I could not reset the TB doing the peddle dance, I took it into Nissan for them to reset and it cost me £69, lesson learnt.

[davey_83]

I've cleaned out my throttle body and manually moved the butterfly, no big deal just had to reset the TB learning as per the guide on the forum.

 

 

[J Harris]

So it's not likely to be something mechanical busted by moving the butterfly. Just throws the sensor out?

What relearn is best to try first?

[J Harris]

Will try TB relearn first then ecu relearn. Unless someone warns me otherwise!

[Mark@Abbey m/s]

On the later cars the HR the TB are wired live all the time. Moving the TB seems to corrupt the IDLE/NATS Eprom and causes Idle issues. I would not open any TB without disconnecting the TB/ battery and ECU.

 

Thanks

[J Harris]

Still cannot resolve...I've got the tb reset dialed but each time I start the engine following the peddle dance it continues to idle at 750rpm then drop to 500rpm for only about 5 seconds then back up. Ocassionly it will stall after a few revs.

Might be a stealership job as I'm running out of options! Any recommendations?

[Chris141084]

There are four resets, the ecu, throttle body positions, and I really cant remember the name of the third, think its the idle air volume reset. I had a similar fault, did these three it that order and it was cured â˜ºï¸ this is the link with the guide I followed

http://www.350z-uk.com/topic/53148-how-to-ecu-accelerator-pedal-throttle-valve-resets/

Edited April 1, 2017 by Chris141084

[davey_83]

Yes i did all three, idle control valve, pedal position reset and throttle body reset.

[Stutopia]

Still cannot resolve...I've got the tb reset dialed but each time I start the engine following the peddle dance it continues to idle at 750rpm then drop to 500rpm for only about 5 seconds then back up. Ocassionly it will stall after a few revs.

Might be a stealership job as I'm running out of options! Any recommendations?

 

Do you have a DE or an HR? I think you said it was a 2006, so you should be safe as it'll be a DE. If it's an HR see post 7 above by Mark.

 

Either way, if you're certain you've done the suggested procedures correctly and you've not introduced any leaks putting things back together, consider contacting a specialist like Abbey, Horsham or Cougar Store (nearest to you I think).