TBI to TPI harness question
Thread Starter
Junior Member
Joined: Nov 2020
Posts: 14
Likes: 1
From: Chesapeake Virginia
Car: 1991 Camaro RS
Engine: TBI 305
Transmission: T56
Axle/Gears: 3.42
TBI to TPI harness question
I have a 91 TBI Camaro that I am converting to TPI. I have a 91 TPI engine harness. I read somewhere that it is a plug and play swap except Two wires need changed, Does anyone know which Two they are and what to do with them, Thanks
Joined: Nov 2008
Posts: 2,097
Likes: 177
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: TBI to TPI harness question
Is the harness from an automatic TPI car? I had to add the reverse light switch to the c100 connector. You'll also have to change the vss wires to bypass the speedometer buffer box to go straight to the ecm instead. I think that's it.
Thread Starter
Junior Member
Joined: Nov 2020
Posts: 14
Likes: 1
From: Chesapeake Virginia
Car: 1991 Camaro RS
Engine: TBI 305
Transmission: T56
Axle/Gears: 3.42
Re: TBI to TPI harness question
its from an auto car. I already T56 swapped the car so back up lights are taken care of. And I needed a Dakota digital box to make the speedometer work. It goes straight to the speedometer.
Joined: Nov 2008
Posts: 2,097
Likes: 177
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: TBI to TPI harness question
http://www.austinthirdgen.org/?pid=19 The C100 and C207 are all you need to think about. If there's any discrepancies then you'll find them there
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