× 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: Understanding Intake Manifold Pressure Waveforms
Posted to Technical Theory Forum on 5/13/2018

Most engines fire the injector on a closed valve (if that's what you were getting at). Getting the fuel in the port, and onto the back of a hot valve before the valve opens, better vaporizes the fuel vs. spraying it when the valve is open.

I have seen a few ... Login to read more.