[Gmecm] creepy idle

[Dustin Lof]

Steve, have you measured the tc stall speed?  1450? 
How about A magnetized distributor shaft?  Dustin Lof

--- Steve Ravet <Steve.Ravet at arm.com> wrote:

>  
> 
> 
> ________________________________
> 
> 	From: gmecm-bounces at diy-efi.org
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of
> Andrew Gibson
> 	Sent: Thursday, January 26, 2006 2:54 PM
> 	To: gmecm at diy-efi.org
> 	Subject: [Gmecm] creepy idle
> 	
> 	
> 	Steve it sounds like a load issue. Since it idles
> like it should
> in neutral but not drive, even with the bad prndl
> switch, you need to be
> looking at the precived engine load aka MAP, a/c
> input, etc. Anything
> that would make the ecm want to go higher on the
> idle. This alone
> shouldn't be an issue though. 
> 	 
> 
> Thanks for the reply, since I posted I have checked
> the MAP.  It reads
> 100kpa key on engine off so should be fine.  It
> reads 45 kpa idling in
> neutral, and around 65 kpa idling in gear, before
> the IAC starts opening
> up.  PN switch is the only thing left at this point,
> I'll get it working
> and report back.  A/C request is reported correctly
> on the scan tool.
> 
> 	 
> 	With an auto trans the IAC shouldn't be over 50 at
> 750 rpm.
> Check the stall speed on your torque converter. It
> may have balloned and
> reduced the stall speed thereby making it impossible
> to attain 737 rpm
> in drive or any gear for that matter.
> 	 
> 
> I can rev it higher with the throttle, it's just the
> IAC can't seem to
> flow enough air to get it over 725 when the computer
> wants 737.  I treat
> this truck very gently (289K miles total, 159K on
> the engine) so there
> better not be any ballooned TCs!
>  
> thanks for the suggestions, I'll write back when I
> know more.  For now I
> shift into neutral at stop lights.
>  
> --steve
>  
>  
> 
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