300 Opti - Injector Troubleshooting ?

**Hebert519** · 01-20-2020, 07:10 AM

Guys,

I have an 08 300 optimax with 235 hours, it was running great and i got an alarm.
Smartcraft says starboard injector not functioning properly.

I pulled the plugs first and #1 is clearly darker than 3 and 5.

Where should i start looking or testing first ? Fuel or air injector ?

**half fast** · 01-20-2020, 09:39 AM

Without a merc ddt or cds merc software on a laptop , I’m afraid it’s gonna be some guessing involved . Hf...

**XstreamVking** · 01-20-2020, 09:50 AM

Can't you reference the ohm's from one to another fuel injector. And same for direct (air) injectors. Not a tech, so prob wrong...

**Hebert519** · 01-20-2020, 10:07 AM

Originally Posted by XstreamVking

Can't you reference the ohm's from one to another fuel injector. And same for direct (air) injectors. Not a tech, so prob wrong...

I was thinking something like this could be done before i take it in. Fortunately i have easy access to a dealer that can scan it but id like to at least try something first.

**billybob** · 01-20-2020, 10:52 AM

Have it checked, with a cds first. It will tell hours & frequency of fault. You have too nice a motor to screw around, & mess something up.

**InjectorService** · 01-20-2020, 05:35 PM

Hebert, click the link to my website below. If you scroll to the bottom you will find a download link for the 300XS Service Manual. That should be able to give you some troubleshooting steps, wiring diagrams etc. I agree with BillyBob though, probably a good idea to get a CDS hooked up. Injector resistances are below as well.

Fuel Injector 1.8 ± 0.1 Ω
Air Injector 1.3 ± 0.3 Ω

https://injectorservice.com/optimax-fuel-system

**Euroski** · 01-20-2020, 07:01 PM

Check the fault code first, but good time to have them(air & fuel) cleaned and tested!

**TraceF3** · 01-28-2020, 03:27 PM

Originally Posted by Euroski

Check the fault code first, but good time to have them(air & fuel) cleaned and tested!

Without starting a new debate... where could I get this done for a fair price? I'm in central FL.

**bouyhead** · 01-28-2020, 06:02 PM

Iv'e had this service done twice on two different opti's. In my neck of the woods it was about (can't remember)$40 per injector to have flowed and cleaned. If you have a bad air injector hold on to your a$$, their pricey.