We are working on a Mazda 3 that keeps setting code PO304, miss fire on cylinder #4. We have checked: spark, fuel, leak down was 20% or less, smoke test was okay. We did reseal the intake manifold, have swapped plug, coil, injector. Problem does not follow, st...

FIX posted 10/17/2014

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle