need the wires (the colors) that need power for the TBI and Spark to work. I am pulling my hair out on this thing. If you have any insight please call me at 1-910-818-3929. The city Say the truck needs to run by Mon. morning or it is a $250 Fine and it gets impounded.

TBI setup is from a 1990 K5 Blazer

I am not getting fuel through the injectors. I am getting fuel to the throttle body.

Are the steering column wires needed?

What wires need what power? What color wires need switched power? I am lost with this thing. Been working on it for 7-10 days now. Need it ready for URE this weekend.

Do you have spark? Are the injectors pulsing when turning the key. One thing to try is dump some fuel down the throttle body and if it will fire then the spark is ok and you probably dont have power to the injectors.

Do you have spark? Are the injectors pulsing when turning the key. One thing to try is dump some fuel down the throttle body and if it will fire then the spark is ok and you probably dont have power to the injectors.

I have spark but no flow from the injectors. I can spray startiing fluid and it will fire up and run for a second or two.

The big line on the throttle body is the inlet and the small one is the return?

this helped me......
[http://community.webshots.com/album/181820064ALMhbg[/URL]

yes on the fuel lines, check fuel pressure

If you need to move it somewhere quick have someone sit in the engine compartment and spray fuel or carb cleaner just to get the thing moved. Do you have 12v to the injector wires?? Is the module in the distributor good??

All of the info you need is in this forum.
http://www.binderbulletin.org/forums/showthread.php?t=47254

Go to the link above and make sure you have 12V to the inj's all the time.
The ECM provides the ground to fire them.
The red and the white wires going to the inj's are 12V.
The green and blue come from the ECM and provide the gnd.

It may be a little late in the game to suggest this, but I would advise finding a factory service manual for the 1990 K5. They're pricey new, but they can be had in good condition off of eBay for 1/2 the cost of a new one (or less). I got one for the Camaro that was the donor vehicle for my TPI before I began the swap, and I couldn't have finished the job correctly without it (you can more than likely get the same info from the internet, but it's always nice having it all in one place, and easy to reference while you're working)...

The factory diagrams are provided at the link given!!

The factory diagrams are provided at the link given!!

The site did not want to work last night. I will try it tonight. I have a 91 burb as well that I will pull the ignition module form the diz and swap over to see if that is the problem. Anything is possible. I will most likely start swapping all the electrical and verifying they are good on the running burb. Thanks for all the help so far. I will keep you all posted on what if anything I find.

You shouldnt just start swapping parts. Figure out what is wrong with yours first with bills help. He will be able to help if you will listen

You shouldnt just start swapping parts. Figure out what is wrong with yours first with bills help. He will be able to help if you will listen

My plan is to check for power at the Injectors like he said. If I have power and no spark then that would trace back to the ECM on the dizzy. To verify before buying any parts I will swap it/them to my running burb. If they problem moves to the running burb it is pretty certain it is that part.

I plan on using Bills help and tyring what he said. I am not ignoring his advice by any means. What I was saying is if what I have been told to check does not work then I do not have many other options. I do not have the time (nor do I expect someone else) to run back to the computer after every minor power check. If someone wants to call me or drop me thier number to try and walk me through it that would be great.

I am very thankful for the help that is being provided and I am sure that all this help will solve the problem.

Edit: After seeing bills location I do not think my wallet will allow that phone call. Although I can get him a DSN to call.

I think I have posted the diagrams on here before. If not I know someone did.
The BB is swapping some server parts right now but will be up later.
You can do a quick search here for something like TBI diagrams and should find them pretty easy.

Edit: After seeing bills location I do not think my wallet will allow that phone call. Although I can get him a DSN to call.
I do have DSN. I'm 10 hrs ahead of west coast.
I only get 2- 15min commercial morale calls a week...your not on my short list tho!!:D
I'll do a little search and see if their here.

Sounds like you definately have spark if you can fire the engine with carb cleaner

Yep, That's why I only addressed the power to the injectors.
Some people think the ECM provides power and hook the red and white wires to ground!!

Try this link for an alternative to the diagrams.

wiring diagrams with voltage checks (ftp://ftp.diy-efi.org/pub/gmecm/manuals/1227747/)

Yep, That's why I only addressed the power to the injectors.
Some people think the ECM provides power and hook the red and white wires to ground!!

Try this link for an alternative to the diagrams.

wiring diagrams with voltage checks (ftp://ftp.diy-efi.org/pub/gmecm/manuals/1227747/)

Thanks for the help. I will be cussing at this thing again this evening.

On a side note, do they monitor your calls/length? I could get you an east coast DSN that is a computer operator if you want it? I would call it and put in the number I wanted to call. If it was a local number it would not cost me anything. If it was long distance I would use my calling card and the rate would be like I am sitting on the east coasdt instead BFE afghan.

I'm sure Pope/Bragg have a morale line for the guys over here.
We are monitored for the 15min but not really on how many.

OK I have power to both injectors. I do not have a ground though. I verified that I should have a ground when the motor is cranking over on my running burb. I am not sure where to go from here. I swapped the ecm onto a running truck and it worked fine. I figured it would not hurt to try anyway. I do not know where to go from here or what to check. Thanks

The ECM will not fire the injectors until it recieves the signal from the ICM in the distr via pin B5.

But before we get too far...are you sure your power wires and gnds are good.
The 12V sw on the pink/blk wires have 12V in run and start?
the org wires have a full time Batt voltage?

Gnds-blk/wht read near 0 ohms?

If good then use the sheet 1 and sheet 6 diagram. Look at B5.
Check the voltage at the distr and at the ecm. while cranking.
It is normally a purple/wht wire and there are 2 in the harness. So it's possible to cross these if someone modified the harness.


If you have spark during cranking but don't have voltage at pin C of the ICM then the ICM is probably bad.
Look at sheet 6 of the diagrams for the connection from the ecm to the ICM.
The ICM has to be mounted on a clean surface with the thermal conductive paste.

If the truck had the factory anti-theft system with the little gem on the ignition key...that could be your problem. You have to have the ecm reflashed and have this removed. You can always check with Jim's Performance in Columbia Maryland. Thats all he does is simplify harnesses and reflash ecm's. He knows whats up and is a straight up awesome guy. His website is jimsperformance.com

If the truck had the factory anti-theft system with the little gem on the ignition key...that could be your problem. You have to have the ecm reflashed and have this removed. You can always check with Jim's Performance in Columbia Maryland. Thats all he does is simplify harnesses and reflash ecm's. He knows whats up and is a straight up awesome guy. His website is jimsperformance.com

That is VATs and it's not on the 87-91 truck ecm 1227747.
It was used on some of the car ecm 1228746.

Another quick test of the ICM I was told about but haven't been home to try is to use a test light.
connect the clip to 12v and with the key on, tap the probe on the P terminal of the ICM. This should fire the coil and the inj if all is good