High Idle

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rangernation
Posts: 2
Joined: Mon Aug 08, 2011 8:52 am

High Idle

Postby rangernation » Mon Aug 08, 2011 9:04 am

I have a 99 Nissan Quest, Just recently changed the knock sensor and o2 sensor.. after i finished the van ran beautiful except for the o2 heater circuit which i tracked down to a couple of cut wires. I repaired these and restarted the van and that day it ran fine. It sat over night and i started again to get it ready for smog and it had a high idle like 1800 rpm. So i actually removed the upper intake and replaced all the injector seals thinking that it may be that due to one being broken. now i have to give it a bit of gas to start it and it still has the high rpm (1800) i have traced the high rpm back to the IAC but the the starting problem i have not located. Even though i found the high idle problem i am still unable to find out why,

What i have done:
Changed knock sensor
all new intake gaskets
followed the Nissan service manual for installing the intake
changed the o2 sensor
repaired 3 broken wires for the o2 sensor
cleaned throttle body

It kinda sounds like a vacuum leak but i have had no luck locating one, I don't know if the engine just sounds like that normally or if there may be a leak. Never had this problem before.

I am stuck with a van that runs smooth and has power just a high idle and hard starts has anyone come across this problem before. Any information would be greatly appreciated and any more information will be given if needed

Thanks


Buckshot
Posts: 48
Joined: Thu Dec 09, 2010 9:09 pm

Re: High Idle

Postby Buckshot » Mon Aug 08, 2011 6:36 pm

yes you cleaned the throttle chamber and it needs to have the idle volume learn done and the only way I no is with Nissan consult.

rangernation
Posts: 2
Joined: Mon Aug 08, 2011 8:52 am

Re: High Idle

Postby rangernation » Mon Aug 08, 2011 8:39 pm

With such a short response that explains so much thanks, I tore this thing down twice because i thought i had an intake leak after this started..

I found some Non Consult procedures on the net maybe i will get lucky and not have to visit the dealership


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