do a search in the civic forum on the fuel filter. My opinion is that if you ahve one in there, it's good to go. I've never had a problem with injectors clogging...

The turn signal, sounds like the switch is broken. If you disarm your airbags, take off the steering wheel, there are 3 screws that hold the turn signal and headlight arms on. Unplug the electrical connections, and throw a new one in. Should be all your problem is. 15 bucks at the junkyard is all it should cost you.