[Gmecm] Re: Gmecm Digest, Vol 11, Issue 11

[Steve Ravet]

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org 
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Cowen
> Sent: Friday, January 27, 2006 11:32 AM
> To: gmecm at diy-efi.org
> Subject: [Gmecm] Re: Gmecm Digest, Vol 11, Issue 11
> 
> Steve,
> 
> I'm certainly no expert, but I'll toss in what came to mind.  
> This problem could be from one of two causes:
> Load change (and hence RPM drop), or engine movement.

The thing that puzzled me initially is that I see the idle RPM, A/C
request, VSS, and other sensor and calculated values on the scan tool
and they all look fine (except for the P/N switch).  These are the
values the ECM uses internally for it's computations, so if the computer
was being misled by noise I think I'd see the bad values on the scan
tool also.

I remembered the fine IAC document that Bob Rauscher wrote some time ago
that is posted on the gmecm page and went back to read it.  The P/N
switch is heavily involved in IAC positioning so I'm holding out hope
that it's the culprit.  I'll find out this weekend.

thanks,
--steve

 

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