How can you clean the fuel injectors on a 1989 Honda Civic si by yourself?

Answer 1

I've used both Seafoam and Lucas with great results. I've also heard Techron is very effective, and even STP.

Pouring whatever cleaner you choose into the TB will NOT clean your injectors. A FI engine doesn't work that way. It MAY help clean carbon build up in the intake, but it won't do anything for the injectors. There are several articles on various Honda forums on how to use Seafoam to clean your intake.

To clean your injectors, simply pour your chosen cleaner into the fuel tank. Fill the tank to ensure mixing, and drive the car. I wouldn't refuel until you get to 1/4 tank or less.

Professional shops do offer fuel injector cleaning services. These vary in effectiveness. If you go the professional route, I'd stick with a Honda dealer, or an aftermarket Honda shop.

Try using Seafoam. Pour it lightly into your throttle body and then take the car out for a spin at wide open throttle. You will get a ton of smoke, but that's normal.