TBI to TPI swap, speedometer not working...
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Supreme Member
Joined: Jul 1999
Posts: 1,817
Likes: 1
From: Plano, TX
Car: 1992 RS
Engine: 406 Stealth Ram
Transmission: 700R4
TBI to TPI swap, speedometer not working...
Well, all my other gauges work, except the speedometer. I removed the buffer box that the TBI ECM needed, but now I need to know which wire(s) I need to hook up on the gauge harness from the wires that were going to my buffer box. Thanks!
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Joined: Jul 1999
Posts: 1,335
Likes: 2
From: Tucson, AZ, USA
Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
You need to connect pin B11 of the ECM to the cluster VSS input & pin C1 of the ECM to the cruise control VSS input. The schematic is attached.
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iTrader: (2)
Joined: May 2009
Posts: 3,371
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From: Delaware
Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: TBI to TPI swap, speedometer not working...
Question, my car was also converted from TBI to TPI. Originally a 91 TBI 5.0 and now it has a 90 TPI SD. My speedometer doesnt work either. Never did.LOL Where should i start looking? Should i connect a wire from a certain vss pin on my ecm directly to the vss itself? Is that what you are saying? Explain. I really want to get this thing working! thanks.
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