× 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: 93 Ford F150 pickup 4.9L
Posted to Technical Discussion Forum on 6/21/2003

Rick

Portable lab scope on coil wire may answer question. Does spark drop out? Does initial peak drop down meaning loss of secondary voltage? Does mixture go lean seen by high and upcurving burn line? Do just some of the pulses drop down or out?

Under load... Login to read more.