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Idling issue

Posted: Fri Apr 01, 2016 8:29 am
by louisq90
Good afternoon,
Im having an issue with my 99 Altezza. Altezza idle jumps around when at idle temperature.
* Clean the MAF & throttle body
* Tested Coils
* New timing belt and water pump
* Good Fuel pump and filter
* Checked fuel injectors
* No vacuum leaks
* Tested Coolant temp sensor

Weird thing is the the only codes i get from the ODB II is 21 and 28 which are the o2 sensors.
But from reading a few posts, the o2 shouldn't cause idle issues.
Any help will be greatly appreciated.

* Can it be the MAF even if i receive no CEL?

Re: Idling issue

Posted: Fri Apr 01, 2016 10:00 am
by ThatGuy
Check the throttle position sensor voltage, there a thread either on here or the altezza club of NZ on how to do it but it seem loads of people have been having this problem recently including me

Re: Idling issue

Posted: Fri Apr 01, 2016 10:16 am
by louisq90
Yes, that was the first thing i checked because many people were having the issue. I adjusted it to .78.
When i disconnect the MAF sensor the idle issue goes away and runs fine.

Re: Idling issue

Posted: Fri Apr 01, 2016 2:23 pm
by ThatGuy
So does it only idle hunt when the maf sensor is connected? It could just be a dodgey sensor then?

Re: Idling issue

Posted: Fri Apr 22, 2016 4:20 pm
by j2jedi
Might be that the OBD-2 port (which works as OBD-1) does not give the information you're looking for.
I'd go with the last poster :)