Pipe
Wiring Harness?
Thread Starter
Drifting
Joined: Jan 2003
Posts: 1,894
Likes: 3
From: Reading PA.
Wiring Harness?
Does anyone make a conversion harness to convert a 84 TBI over to the TPI system. I know why would ya want to do that. Or could ya just grab the ECM and wiring harness off of an 85 or later and hook it up? Also would the dash wiring from the 84 plug right into the 85s ECM and work properly? THANKS FOR ALL THE HELP GUY'S i'm a little more schooled in the TPI system guess that's why I wanted to change it over. Pipe 
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
I wouldn't convert to an 85 system, unless it was just less wiring.
I bought a 90 TPI MAP harness from Chevy_tpi on ebay. It's intended for wiring TPIs to carbed cars. He will also package in a ecm and custom chip to delete VATS, and various other things.
Youre somewhere in between. If you're lucky you may be able to adapt to the incar harness on the 84 and just change ecm and ecm connectors inside the car.
I have a full diagram for the 89 & 90 somewhere, but have never seen one online for the 84
I bought a 90 TPI MAP harness from Chevy_tpi on ebay. It's intended for wiring TPIs to carbed cars. He will also package in a ecm and custom chip to delete VATS, and various other things.
Youre somewhere in between. If you're lucky you may be able to adapt to the incar harness on the 84 and just change ecm and ecm connectors inside the car.
I have a full diagram for the 89 & 90 somewhere, but have never seen one online for the 84
Pro
Joined: Feb 2006
Posts: 731
Likes: 0
From: British Columbia
pianless performance makes a wiring harness for your car called the perfect management system for your application and so does Howell. I also have an 84 and I bought the howell wiring harness from a guy on this forum with a 90 computer.
I haven't installed it yet because I'm saving for a 383.
I haven't installed it yet because I'm saving for a 383.
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Originally Posted by nelson84
switching to tpi. Look out for those crossfire thugs on here they will convince you to not to switch or sell your car.
They do sell the harness for the conversion. When I researched it pcmforless I think had a pretty good one. And I think it was a pretty good price too. Maybe like $400 or so, there was also some other adapter piece to get but can't remember just go to there site.
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
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Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Here check this out http://painless.r-catalog.com/pg-lkp/products.asp
they have harness and adapters
they have harness and adapters
