1984 carb to TBI (maybe) question

[Honky Kong jr]

There are a few wires for the TBI that go into the cab via the bulkhead connector.

 

[74 Shortbed]

Also, the actual in cab harness for the FI. After it exits the ECU is it standalone and exit the firewall via a grommet?

Yes, on the passenger side by the heat/AC box you can't miss it..

 

[Honky Kong jr]

Ok more educating... good stuff. I had to google the DRAC module to see just what the heck it was. Learned a bit about them, what they do, and how to move jumpers for different sized tires. However.. where are they mounted on TBI equipped squares??

Also, the actual in cab harness for the FI. After it exits the ECU is it standalone and exit the firewall via a grommet? Or is it part of the bulk connector that ... well exits the firewall.

Thanks guys

Yup kinda looks like the fire wall threw up.

 

[4WDKC]

Ok more educating... good stuff. I had to google the DRAC module to see just what the heck it was. Learned a bit about them, what they do, and how to move jumpers for different sized tires. However.. where are they mounted on TBI equipped squares??

Also, the actual in cab harness for the FI. After it exits the ECU is it standalone and exit the firewall via a grommet? Or is it part of the bulk connector that ... well exits the firewall.

Thanks guys

I traced it in the 93 I had and it had a separate harness, I think the 87 would be separate also. Guessing its the plug close to the AC box.

 

[74 Shortbed]

Right under the pump relay.

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[79SierraClassic]

Another difference was in the fuel tank selector switch. The carb units had a switch that just clicked from side to side. The inj units had a switch that was spring loaded for a momentary contact that had to be held for a second to switch. The switch also had to switch power to the fuel pump from side to side.