Questions Covered in This Guide• What are thread size, reach, and seat type?• What do new buyers confuse most often?• Why can spark plugs that look similar still not be interchangeable?• How should th
Questions Covered in This Guide• What is spark plug reach?• What problems can happen if the reach is wrong?• How does reach relate to combustion chamber position?• Why is reach not the same as thread
Questions Covered in This Guide• What is spark plug gap?• What problems can happen if the gap is too large or too small?• How does spark plug gap affect cold start, idle, and misfire?• Why can spark p
Questions Covered in This Guide• What is the difference between working with a direct factory and a trading company?• How does it affect quality control?• How does it affect price and lead time?• Why
Questions Covered in This Guide• What is the difference between OEM and private label ignition parts?• What type of buyers does each model suit?• What can be customized in logo, packaging, and labels?
Questions Covered in This Guide• Is the product hierarchy complete enough?• Are the technical parameters clear enough?• Are material consistency and product quality stable?• Does the supplier support
Questions Covered in This Guide• Is the supplier a real factory or mainly a trading company?• How should you judge production capacity?• How important is the quality control system?• Are the coverage
Questions Covered in This Guide• Is the product material hierarchy clear enough?• Is the technical parameter information complete?• Are OE and cross reference data accurate?• Does the supplier support
Questions Covered in This Guide• Does the supplier support OE matching?• Is the vehicle coverage wide enough?• Are there ready-stock models available?• Is the lead time stable and realistic?• Is the q
Questions Covered in This Guide• What does the ignition coil do, and what does the spark plug do?• Why must ignition coils and spark plugs work as a matched pair?• Can a bad spark plug affect the igni
Questions Covered in This Guide• Why does pin count matter?• Why is connector shape important?• What does electrical matching mean in ignition coil replacement?• Why does installation compatibility ma
Questions Covered in This Guide• What is spark plug heat range?• What happens if a spark plug runs too hot?• What happens if a spark plug runs too cold?• How does heat range affect fouling?• How does
