when do you know when to change Replace fuel injector's I have them out and they are ugly I believe they are the originals that came with the car "stock" The ends are all clogged up I did get a rebuild kit for them to replace they ring's and hat's.Can I soak them in something or is that a
MEK or Acetone, or a 50/50 mix of the two. They are available from Home Depot or Ace Hardware. Try to avoid getting the MEK on the plastic, as it is a solvent for some types of plastics.