LS1 Lean Cruise

[Romans, Mark]

There are two things going on here.
1) Hwy Fuel
2) Hwy Spark
Two separate things.
Hwy fuel is a light load commanded, calculated afr setting.
Kind of like pe, it checks back to 14.7 to one to make sure the
BL and INT are ok.
Hwy spark is a light load commanded spark adder.
The hwy spark is just load and rpm dependant.
The hwy fuel is speed, load, coolant temp and rpm dependant.
(My experience is ONLY on the 89 Vet code.
86-87 code has only hwy spark (As far as I have been able to determine)
Mark
----- Original Message -----
From: <Stephen.Kaminska at HSC.com>
To: <gmecm at diy-efi.org>
Sent: Wednesday, December 06, 2000 9:08 PM
Subject: Re: LS1 Lean Cruise


>
> romans at starstream.net writes:
> >
> I never heard it, just picked up by the knock sensor, 1-2 deg usually.
> My hwy cruise mode is in for 60 seconds then out for 5 then back in.
> <
>
> OK, finally have to get out of lurk mode here because I am lost by this
> thread.   What happens if you do not jump in and out of hwy cruise mode?
> Do you start getting lean misfire?  Or does the ECM decide you are running
> way too lean and command full rich?  Or both? Or none of the above?  What
> is the engine telling you?
>
> Rick
>
>
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