View Full Version : LS1 Harness hose?

04-21-2012, 05:48 PM
What is this plastic vacuum style hose that runs through the LS1 engine harness and comes out by the PCM connectors? Where does it hook up and can I eliminate it?

04-21-2012, 06:19 PM
Vacuum source from rear of LS1 intake to AC/heater system. Delete it for a standalone harness.