The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 12-10-2008, 11:58 AM   #1
skidder111
Registered User
 
skidder111's Avatar
 
Join Date: Jan 2008
Location: Pincher Creek, Alberta, Canada
Posts: 140
Re: Tbi swap build thread

I did this swap in my 72 K5 some years back. It is hooked to the original 4 spd. My question: How important is the vss on this setup? It was never hooked up. Is it required for the ECM to go into closed loop?

Last edited by skidder111; 12-10-2008 at 11:58 AM.
skidder111 is offline   Reply With Quote
Old 12-10-2008, 05:50 PM   #2
cjracing15
Registered User
 
cjracing15's Avatar
 
Join Date: Jan 2007
Location: Lexington, TN
Posts: 1,427
Re: Tbi swap build thread

Quote:
Originally Posted by skidder111 View Post
I did this swap in my 72 K5 some years back. It is hooked to the original 4 spd. My question: How important is the vss on this setup? It was never hooked up. Is it required for the ECM to go into closed loop?
From what I have read the vss is used by the computer to see how fast the car or truck is going. The vss is also used to control the egr valve the charcoal canister purge valve, idle speed, and air fuel ratio at speed.

I belive in this way, if chevy did'nt need it why would they spend the money to have it installed in the wiring harness.

How does your truck run with out it?
__________________
The fleet
94 Chevy 4x4 reg cab
2018 Traverse (wifes car)
1977 SWB stepside
1949 Chevy truck

Last edited by cjracing15; 12-10-2008 at 05:50 PM.
cjracing15 is offline   Reply With Quote
Old 12-10-2008, 06:17 PM   #3
skidder111
Registered User
 
skidder111's Avatar
 
Join Date: Jan 2008
Location: Pincher Creek, Alberta, Canada
Posts: 140
Re: Tbi swap build thread

The truck runs great. The VSS is for the electric speedometers and cruise control, but I'm wondering if it does anything else. If it is supposed to control the issues you mentioned above, but is unable to, would you get a code?
skidder111 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:02 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com