× 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: Wasted spark system that only miss on one cylinder
Posted to Technical Discussion Forum on 7/9/2022

Hello Hairul,

Basically, a waste spark coil fires 2 times, once on the compression stroke TDC and once on the exhaust stroke TDC, hence the name "waste spark".

These coils do fail internally so the secondary ignition (spark) will be lost on one cylinder an... Login to read more.