Did you use the complete harness from the v8 truck, or did you use harnesses from both trucks? How bout the ignition control module? Did you just use the one in the i6 truck or the one from the v8 truck?

 

 

 

So you have 2 injectors that aren't plugged in then?

 

You need to replace the ICM as you went from a 6 to 8 cylinder engine. This will throw off the computer.

 

 

No you do not. The ICM is triggered by the computer. The ICM is the same for a 6 cylinder and 8 cylinder engine.

 

 

Possible he's having the black vs grey icm problem?

 

 

Yes... that is exactly where I was going with my inquiry and there is no easy way around it so you have some work to do. You need to figure out what devices are on what pins on the engine side of the harness and match them up with the corresponding pins on the chassis side.

P.S. Easiest way to do this is to first map the I6 engine harness, then do the same for the V8 engine harness and then just move pins in the bulkhead connector of the V8 harness to match the I6 layout... these connectors come apart so no wire splicing necessary either. Assuming both motors are equipped with the SD harness then there should be the same number of wires in each, and all you need is a multimeter or circuit buzzer to test for continuity from end to end.

 

 

Hey, the thing has actually run, so you're ahead in the game near as I can tell.

This is a repost of Randy/rla2005 wiring help to me that I used to convert my 94 to mass air.

It should help you fix yours with guidance:

Try these. All for a 1994
Attached Images

 

Question to the group, if a 8 cyl SD grounds two banks of 4 injectors, one batch at a time (don't know the grouping)...

What is the pairing a 6 grounds?