questions on gm 1226867 DJU TBI system

[mrvette]

I can tell you that allthough it did set a code, the 1227730 computer ran just
fine without a speed sensor input, only thing was that the idle did tend to
drift without it, soon as the sensor was added some 3 months later, it settled
right down and no problems after that....GENE

Stowe, Ted-SEA wrote:
> 
> hi.
> 
> I am slowly moving to put this gm 4 cyl 2.0 L tbi system on my 77 mgb. it is
> out of a 85 Pontiac sunbird.
> 
> I am trying to ascertain if I should worry about the following info.
> I'd appreciate any advice.
> 
> I have found a speedo place, US speedometer, that will sell for $99.00 a VSS
> substitute, (2000 pulses per mile), just hook up 12 volts and your speedo
> cable.
> a minor problem is that the english cable sizes don't match, but I'm sure
> they can make me up a custom cable.
> 
> However I wonder what the ECU used this input for ?
> 
> the EPROM/calpak I have thinks that it will be in a 2.0 tbi, non-closed
> loop, no AC, 3 speed auto thm 125 automatic, with a 3:18:1 final drive.
> 
> this is a 4 speed manual 1.8 litre, (no ac), 3.909 final drive.
> 
> I would like to keep the error code feature of the ECU, so if I disregard
> the VSS input it'll just keep telling me that the VSS signal is missing.
> 
> questions:
> 
> I guess it looked at vehicle speed for something, some element of the map
> for the injector ? or was it just to know when to ground the solenoid for
> 3rd gear in the auto trans ?
> 
> if it is the latter does anyone know where I would nop out the code for this
> (so I don't get an error) ?
> 
> should I worry about getting a different calpak and EPROM ? maybe something
> with a manual trans ?
> 
> how would I figure out what my calpak and EPROM choices are ?
> 
> I see that a mempak is used in later ECU models, is this some kind of
> consideration?
> 
> also I need to get an external fuel pump, in the required psi range. does
> anyone have any good suggestions ? I know that the jetronic-d in the Porsche
> 914 would work and is a vaguely similar size. I think it put out 20+ psi.
> most of the pumps I see are internal pumps which I can't use.
> 
> oh minor detail, the air cleaner, it appears that with my downdraft
> manifold, I will be very close to the top of the hood already, so I have to
> come up with some sort of plumbing that goes off to the side, and adds as
> little height as possible.
> does anyone have any thoughts about this ? I need to use something that has
> an air filter, etc.
> 
> another MD, I got a 'electronic ignition module' for an 85 sunbird EFI
> distributor. I am thinking that I can get a used mgb hall effect distributor
> and use that as is, hooking it up to this module and then the module to the
> inputs/outputs on the ECU. so that is kind of tidy. however do I need to use
> the GM coil as well ? does anyone know where I can get the OEM connectors
> for this module ?
> 
> thanks a lot, and thanks a lot for all of the excellent prior help. I would
> not of got his far without it.
> 
> Ted Stowe

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