Drivers-Side Plugs Black
Thread Starter
TECH Apprentice
Joined: Jul 2010
Posts: 363
Likes: 1
From: Huntsville, AL
Drivers-Side Plugs Black I pulled out my plugs for a header swap and all the plugs on the driver's side are black with soot. The passenger side looks fine. They probably have less than 10k on them. All the plugs looked fine the last time I changed them. Is it probably running rich on that bank?
most probably O2 sensors. mine were literally painted black when my O2s went bad and they had few miles on them. is it throwing codes? try swapping O2 sensor sides and see if that changes the plugs on the other side.
