Dudeeee thanks so much for posting this!! I had a similar issue with my seadoo DI air injector. It made a very faint sound when I tested it. Put some PB blaster through it and gave it some love taps and BAM! Back to working and my ski is running again. Thanks again!
These are for either blue or black air injectors, fuel injectors are a little different to clean and I had the dealership clean them. I used kroil to clean them but b-15 works better. I bought the injector cleaning kit off of amazon for $25, make sure to get the one that has the kit with 4 different attachments.