Quote:
Originally Posted by skidder111
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?
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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?