× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: Vacuum below zero
Posted to Technical Theory Forum on 5/4/2020

I don't know why absolute pressure is so hard to understand. Granted, I didn't always think in terms of absolute. KOEO, the pressure in the intake manifold is not 0 psi; it is whatever atmospheric pressure is at that moment. When the engine is started; mani... Login to read more.