[Diy_efi] Best donor vehicle for GM TBI system???

[Mike]

Thanks Dustin

I'll keep looking for a van with a 1227747 ecm and a wiring harness for my 
donor vehicle, hopefully there not uncommon in vans.
I do have cruise and have seen that sensor, thanks for the tip.

Mike...
----- Original Message ----- 
From: "Dustin Lof" <bubblesjrtwo at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, September 20, 2005 3:51 PM
Subject: Re: [Diy_efi] Best donor vehicle for GM TBI system???


> Mike, first if it has a 1227747 ecm it would be a good
> donor anything else and it is just more work for
> yourself.  Second the vss buffer piggybacked to the
> ecm is there to convert the A.C. voltage produced by
> the speed sensor on the back of the transmission into
> a 5v D.C. square wave that the ecm can use.  It also
> provides calibration for your tire size and gear
> ratio.  Your 83 van should use a cable driven spedo
> with an optical vss sensor mounted to the back of the
> speedometer. I have seen vehiciles without the sensor
> but the hole is there to mount one.  There is a buffer
> attatched to that sensor.  It is there so the cruise
> can opperate in your van.  All the calibration is done
> by changing the speedometer gears in the transmission.
> During your retrofit you will need to splice a wire
> from that vss buffer (usually yellow) to the vss wire
> in your donor harness.
>
> --- Mike <sonoma at shaw.ca> wrote:
>
>> Hi
>>
>> I was at my local auto wrecker looking for a donor
>> vehicle I found a 91 2500 GMC Van, I want to
>> transfer this TBI system to my 83 3500 GMC Van.
>>
>> The question I have is a earlier TBI system better
>> than a more recent system the ECM had a speed
>> control module on the side of the ECM (think it is
>> module which tells the ECM what tire size and gear
>> ratio is in the vehicle) I changed this module when
>> I changed the gear ratio in my 91 S10.
>>
>> Can the speed module be eliminated along with the
>> VSS?  Do all GM trucks (87-94TBI) use this module
>> which I've seen attached to the ECM?
>>
>> Will a 1227747 ECM work with all TBI wiring
>> harnesses from 87 Up?
>>
>> Thanks
>>                 Mike...>
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