ecm location
Member
Joined: Nov 2003
Posts: 462
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From: Ft. Leavenworth, KS
Car: 83 TA, 89 TTA, others
Engine: ZZ4 TPI, LC2 turbo v6
Transmission: several, mostly broken
All thirdgens came from the factory with the ECM mounted vertically behind the passenger side dash.
It's basically right behind where the map pocket is, if your car happens to have one. Once you remove the lower plastic trim piece (can't recall GM's name for it), you should be able to look up and see a plastic or metal bracket (most likely metal for your '84) about 6" wide that is held in place by two 7mm hex head screws. Remove those, and the ECM and bracket will drop down together.
If that description isn't clear enough, let me know, and I'll try to scan in a picture or something.
It's basically right behind where the map pocket is, if your car happens to have one. Once you remove the lower plastic trim piece (can't recall GM's name for it), you should be able to look up and see a plastic or metal bracket (most likely metal for your '84) about 6" wide that is held in place by two 7mm hex head screws. Remove those, and the ECM and bracket will drop down together.
If that description isn't clear enough, let me know, and I'll try to scan in a picture or something.
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