[Gmecm] Re: Vortec L31 oscillating at idle

[Steve Ravet]

Darren, this mismatch was in your stock calibration?  Or you
inadvertently created a mismatch?  Or the engine was modified from stock
to create the mismatch?

--steve 

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org 
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Darren Freed
> Sent: Monday, March 19, 2007 9:59 AM
> To: gmecm at diy-efi.org
> Subject: Re: [Gmecm] Re: Vortec L31 oscillating at idle
> 
> I had the same idle problem with my 3.4 DOHC v6.  This 
> problem occurs because there is a discrepancy between the 
> desired idle rpm and desired idle airflow values.  The OBD-II 
> idle algorithm is very different than the OBD-I
> algorithm: both desired rpm and desired airflow are used.  If 
> they disagree, the IAC hunts for an idle speed that will 
> satisfy both criteria.  The only way to fix the problem is to 
> change the desired airflow and/or rpm tables in the flashrom. 
>  Hopefully you can do that with OBD-II TunerCat.
> 
> HTH,
> 
> Darren
> 

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