Deleting ECM ???

[DamHoodlum]

That's because the speedo is run by the VSS buffer module, which is its own separate unit from 92-95.

1989 Too?

 

[DamHoodlum]

Actually on the TBI trucks, the ECM didn't have any say in A/C compressor control - the activation signal went from the head to the compressor relay, which went directly to the compressor. There is a line from the A/C relay to the ECM, but its only purpose was to tell the ECM that the A/C is activated. The only thing you'd need to redirect off the ECM is the fuel pump relay trigger - most everything else is already not a part of it. The fuel pump relay trigger is ECM pin A1, a green wire with a white stripe - which you could put on a toggle switch with the other side connected to the Hot in Run, so it'll shut off when you turn the key off. I only recommend the toggle because Idk how good it is for the pump to run when the engine isn't.

Great Info AK49BWL

Thanks man

 

[AK49BWL]

1989 Too?

The 88-91 clusters have built-in VSS buffers, so you're still good to go.

 

[Frank Enstein]

EXACTLY what I wanted to hear

Mine is a 1989, Does the Speedometer still works from C100 connector on drivers side firewall.
and the ECM controlled the electronics for the trans?

Thanks Frank Enstein

YW! On an 89 the torque converter lockup is the only computer control. Easy to lock it up BMM-70248 IIRC

 

[DamHoodlum]

Anybody need a factory 4.3/700R4 ECM before I throw it away?

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[PlayingWithTBI]

Is that the 1227747? If so, somebody will probably want it. You can modify it with a ZIF socket and flash your own tunes. I already have a couple laying around so, no thanks here.