[Gmecm] Vortec L31 oscillating at idle

[Edwin leahy]

Sound's like your IAC can't compensate enough to keep
it idling.This is either from to much fuel or more
than likely the IAC count's are off.Try adjusting them
in small increment's.What software are you using and
what ECM?It is possible to use the 2000+ LS1/LS6 ECM
with that injection/motor.

> Date: Fri, 16 Mar 2007 06:55:03 -0700
> From: "Jake Tucker" <jktucker at usamedia.tv>
> Subject: [Gmecm] Vortec L31 oscillating at idle
> To: <gmecm at diy-efi.org>
> Message-ID:
> <000401c767d2$b3c713f0$0200a8c0 at tuckeroffice>
> Content-Type: text/plain;	charset="us-ascii"
> 
> 	Well, we're finally getting close to having a
> vortec injection
> transplant running in an '84 Suburban.  We started
> with a fresh 350 with
> vortec heads, and installed a vortec injection setup
> out of a '97 onto the
> motor to replace the TBI system that had been
> running the motor.  There were
> a few setbacks along the way, but now the motor is
> running and appears to
> need just a little tuning.  The main problem now is
> that it is hunting at
> idle.  Engine speed oscillates from 300 to 1000
> RPM's for several seconds
> before the engine dies.  This is especially a
> problem when it is cold, and
> the engine won't stay running at all without opening
> the throttle a little.
> In general, the engine runs, but doesn't give the
> power we'd expect at this
> point.  It is a '75 block that was rebuilt with
> Vortec heads.  To do the
> vortec conversion, all the sensors, intake,
> distributer, crank sensor,
> harmonic balancer, and accessories were transplanted
> from a '97 vortec motor
> with a cracked block.
> 	Any ideas what would cause the oscillating problem?
>  I would like to
> watch the IAC motor counts, but I can't seem to find
> that data on the
> software I'm running.  Right now, I'm using car-code
> 2 which is sold at
> www.obd-2.com.  I also have the OBDII tuner by
> tunercat.  He has since sold
> his design to Jet performance.
> 
> Jake
> 
> 
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> 
> End of Gmecm Digest, Vol 25, Issue 7
> ************************************
> 



 
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