RE: Novice Question

[Carl Summers <InTech@writeme.com>]

Hi Bob,
    Great info...I'll try that out soon....
-Carl Summers



-----Original Message-----
From: owner-gmecm@diy-efi.org [mailto:owner-gmecm@diy-efi.org]On Behalf
Of Bob Valentine
Sent: Monday, April 03, 2000 3:28 PM
To: gmecm@diy-efi.org
Subject: RE: Novice Question


Somewhere in the archives I found this.  I don't know original author. :
------------
	 The number of cylinders is selected by the voltage
	on pin 11 on the 34984 (aka 79435) chip.  This is U13 in a '727, '730,
	and '749.  The pin 11 voltage comes from pin 56 of the MEMCAL.
	This in turn connects to pin 13 of the 16 pin resistor network in the
	MEMCAL.

	Here's how the voltages are interpreted:
	  0 to 1   volt  : 8 cylinder port injection
	  1 to 2.5 volts : 6 cylinder port injection
	  2.5 to 4 volts : 4 cylinder port injection
	  4 to 5   volts : throttle body injection (any cylinder count)
---------

Hmm....   So can you just pull pin 56 of the memcal to ground?  Might try
disabling code 41....

My memcal is on back order from the Chevy dealer here, so I was about to
try and do the same use a V6 memcal in place of a V8.

-> Bob Valentine
-> bob@tecmark.com

At 12:06 PM 4/3/2000 -0700, you wrote:
>I tried this once before and it didn't work...immediately threw a check
>engine light..netres is set up for 6 cylinder and didn't match the
>eprom...hth's
>-Carl Summers
>
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>-----Original Message-----
>From: owner-gmecm@diy-efi.org [mailto:owner-gmecm@diy-efi.org]On Behalf
>Of Todd Burkard
>Sent: Monday, April 03, 2000 11:29 AM
>To: <
>Subject: Novice Question
>
>
>I have a Novice question. Can you take the Eprom from a 1227730 ECM and
just
>reprogram the  27256 chip from a 6 cyl to a 8 cyl and do nothing with the
>rest of the Calpack or do you need to start with a 8 cyl calpack?
>
>The reason I ask is because I converted a 85 TPI'S  ECM to a 90 122730 ECM
>witch is from a 3.1 v-6 witch is the same ECM as the V-8 but the chip
>changes.
>
>Thanks for any help,
>Todd
>

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