My zuki is broken and what I have got it narrowed down to is that the injector is not getting power. If I power the fuel pump and then power the injector (hotwire) it it works. Wires from the ecu to the injector are good too. Question? What other then the ecu would tell the injector not to pulse? Main relay? TPS? What?

Any Ideas would be great as a used ecu is about 450.00 in my area and I cant find one.

The injector gets voltage from the main relay. The ECU then grounds the injector to complete the circuit and energize it to flow fuel. The amount of "on-time" , or when the injector is energized depends on inputs from the TPS,MAP and crank angle sensor as it is a speed-density based fuel map. Do you have spark? If so, I would rule out the crank angle sensor. But a bad TPS or MAP I would still think fuel would flow, and injector would be operating.

Yes I am getting spark. Would the motor try to start if the main relay was screwed? If I pour fuel into it it runs.
So if the map and tsp are gone it sould still run? But does not the ecu turn off thr injector if you aply full gas at start-up? or an I wrong? so if the tsp was readinf wide-open it injector would close ?

If there are two relays ? can you swap them to test it out? i.e. fuel pump would not pump when swapped? used to own a porsche had relays going out all the time and a night or on a long streach of road in the middle of nowhere, I would just swap them around till it ran!

The ignition circuit has a failsafe system that still gives a spark even if the ECU is dead, even the injection system should operate it the CPU dies.  A total failure is likely to be a very dead ECU (no power), the FSM does show a circuit fuse. There are a couple of things you could check. Pull the plug on the MAP sensor and/or TPS and check to make sure you have 5V from one of the connections. Put a meter across the tps and move the throttle up and down and test for a varying resistance. If you can get to the pins on the MAP sensor without disconnecting it then you should see 5V, 0V and something in between. The injector has its own seperate ground back to the ECU (IIRC yours is TBI?)  I have an FSM for the TBI model but there are more than 100 pages on the ECU. If you need more help, PM me and I will try to assist further

Just to start you off (the FSM way, cos I just found it  ). Does the check engine light come on when you turn on the ignition? Can you hear the main relay switch?

circuit fuse??? Where is this fuse? still will not run

Don't worry about testing the TPS, MAP, and other stuff,
you have a bad, connection/relay or a bad ECU, you need
to figure out which it is.

did you try testing the injector for voltage
and the voltage at the MAP could signal a problem
with the ECU power supply.

Check your ECM with a noed tester,its a little light that hooks to your fuel injector have someone crank it over if the light flashes its not the ecm. I sent my ecm to get rebuilt it cost me 185.00 plus the shipping down there it was back with in the week plus it comes with a 18 month warranty. check out www.avproecm.com good luck

Alaska101,
   I had the same problem you're describing and it turned out to be the ECM.  The relays (under the dash, left of steering wheel) would click like crazy when I tried to start it.  If I poured gas in the throttle mine would start too.  
    If yours is the ECM, you might want try having the capacitors replaced by a local electronics shop.  This often fixes the problem and should cost less than $40.

I have a spare '91 Sidekick ECM from an automatic...

Still at a loss on this ecu  

Got all the caps changed still will not run!
I am still working ao the wiring Hope this id it!!
Anyone have a blueprint of the circiut board on a 91 tbi?
This would help alot!

Thanx if you do e-mail  it to Karwin|removethispart|@sasktel.net

Here is what I changed in RED!
What are these??? (White)

Its a bit different to the one I have apart at the moment. I would guess they are the output drivers, probably FETs.

Thanx But what are FET's???
Also I relpaced all the caps still no Vroom  
Anyone have anyother ideas?