[Gmecm] Re: Vortec L31 oscillating at idle

[Jake Tucker]

Andrew,
	Thanks for the reply.  I do have a scan tool (car-code), and I have
set the CMP retard to near zero to turn of the check engine light.  What is
the proceedure for doing the crank learn proceedure with a scan tool?

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Andrew Gibson
Sent: Saturday, March 17, 2007 5:27 PM
To: gmecm at diy-efi.org
Subject: [Gmecm] Re: Vortec L31 oscillating at idle 


Since the swap is on an older block and you are using the same ecm, Chances
are you didn't quite get the crank sensor in the same exact spot. A crank
learn proceedure must be done. I don't know how to do it without a scan
tool. (Athough there is a proceedure floating around out there on how to do
it without one) Once that is done you need to set the CMP retard (basically
ignition timing but isn't the ignition) this does require a scan tool and
you adjust the dist, rev the engine past 1000 rpm, check the reading on the
scan tool, adjust again as necessary to get as close to 0 as possible. Once
these two items are done it should run a lot better.

 
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