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.
No, 1990 1.6s are MPFI,(multi port Fuel injected) or fuel injected, and 1.5s are DPFI (dual point fuel injected) throttle body injected, they are completely different injectors, one motor has one for each cylinder, the other style has two for the whole motor, Injector cleaner can be used to clean injectors Searching for answers like this is much easier and faster from any search engine
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