TBI to TPI swap VSS ??
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Joined: Jan 2001
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From: Ft. Worth, TX
Car: 89 Turbo Trans Am and lots of non-3rd gens
Engine: 231 SFI Turbo's, LT4, LT1
Transmission: 2004r, 4L60E
TBI to TPI swap VSS ??
I have discovered that the VSS sensor is not wired into the TPI ECM. I have the 4L60E tranny, so I must use both the TBI and the TPI ECMs.
Since there is no VSS in the TPI, it is causing the computer to always use the same BLM/Fuel Trim cell all the time. And possibly some cold start idle problems.
*
The trick is that the TBI VSS sensor is 2-pulse, but the '92 TPI setup VSS sensor is 4-pulse. Is there a way to splice the current 2-pulse wire running to the tranny TBI ECM, and run it into the TPI ECM and get the correct reading but adding something inline on the wire??
------------------
Rob
High Performance & Party page
Pics of my rides past & present and recent party pics!
89 TTA #426 20th Anniversary turbo 3.8 bone stock
94 Silverado Tuned Port Injected
87 Grand National- lil' ole V6, highly modded
95 Trans Am Conv.- LT1
Since there is no VSS in the TPI, it is causing the computer to always use the same BLM/Fuel Trim cell all the time. And possibly some cold start idle problems.
*
The trick is that the TBI VSS sensor is 2-pulse, but the '92 TPI setup VSS sensor is 4-pulse. Is there a way to splice the current 2-pulse wire running to the tranny TBI ECM, and run it into the TPI ECM and get the correct reading but adding something inline on the wire??
------------------
Rob
High Performance & Party page
Pics of my rides past & present and recent party pics!
89 TTA #426 20th Anniversary turbo 3.8 bone stock
94 Silverado Tuned Port Injected
87 Grand National- lil' ole V6, highly modded
95 Trans Am Conv.- LT1
<font face="Verdana, Arial" size="2">Originally posted by 2QUIK6:
The trick is that the TBI VSS sensor is 2-pulse, but the '92 TPI setup VSS sensor is 4-pulse. Is there a way to splice the current 2-pulse wire running to the tranny TBI ECM, and run it into the TPI ECM and get the correct reading but adding something inline on the wire??</font>
The trick is that the TBI VSS sensor is 2-pulse, but the '92 TPI setup VSS sensor is 4-pulse. Is there a way to splice the current 2-pulse wire running to the tranny TBI ECM, and run it into the TPI ECM and get the correct reading but adding something inline on the wire??</font>
HTH.
Kelly 'GhoSSt' Rosato
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