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  1. J

    Mercruiser 3.0 PCM-09 Code 3050

    Has anyone done any business with Leaders RPM? They have the catalyst listed for 906 bucks which is less than half every other site I checked lists this part. https://leadersrpmshop.com/mercury-marine-mercruiser-new-oem-catalyst-879288t18/ I sent them an email requesting verification that this...
  2. J

    Mercruiser 3.0 PCM-09 Code 3050

    So because this engine is setup to have this installed do I have any options besides ordering a new catalyst?
  3. J

    Mercruiser 3.0 PCM-09 Code 3050

    ok so it appears to me that the catalyst was removed posting picture. I am assuming this is not good right.... stupid question I am sure. Can see the cast iron seam in pic. so there is no way there is a catalyst insert here right?
  4. J

    Mercruiser 3.0 PCM-09 Code 3050

    Muc - OCS Raw Port and OCS Raw Stbd showing 0.00 mg last time I ran the engine
  5. J

    Mercruiser 3.0 PCM-09 Code 3050

    Thank you again Muc for all your advice, I have a Ham radio event this weekend so it will be a few days before I can get on the water and do a load test on this. Going to check to see if the catalyst was removed tomorrow and post back to you. If so load test not really needed... thanks again...
  6. J

    Mercruiser 3.0 PCM-09 Code 3050

    Thank you for all the guidance on this I have attached the freeze frame listing of all history for faults thrown. Looks like the Exhaust Manifold Overtemp is what threw the engine in Guardian Mode on me. The shift fault was all me, the coolant overtemp fault I replaced the thermostat - it was...
  7. J

    Mercruiser 3.0 PCM-09 Code 3050

    Understood, thank you for the heads up, will follow your recommendation.
  8. J

    Mercruiser 3.0 PCM-09 Code 3050

    Posted new report below - no misfires
  9. J

    Mercruiser 3.0 PCM-09 Code 3050

    I figured out what I was doing wrong with the Diacom diagnostic program. Attached is the running report I pulled this afternoon. It shows alot more data points and the O2 sensors are reading correctly it looks like.
  10. J

    Mercruiser 3.0 PCM-09 Code 3050

    I did not notice an exhaust temp sensor - I will check more closely tomorrow and report back. Also will pull the O2 sensors and check voltage. Thank you for the reply.
  11. J

    Mercruiser 3.0 PCM-09 Code 3050

    Understand completely - it very confusing to me how some of those reading came out the way they did.
  12. J

    Mercruiser 3.0 PCM-09 Code 3050

    Brand new spark plugs - timing is spot on no noticeable timing misses while running.
  13. J

    Mercruiser 3.0 PCM-09 Code 3050

    I am leaning that way but need to make sure before spending that much for a new catalyst. Do you know of any specfic test I can run to make sure its a bad catalyst. I have read several articles that list that as a common issue with this engine. Thank you for your reply.
  14. J

    Mercruiser 3.0 PCM-09 Code 3050

    Thank you for all the things to check, I will do my best to go through all the suggested items tomorrow. Still learning the Diacom diagnostic package need to sit down and review the manual completely so I can ensure I am running the correct test. I will report back my findings as soon as I can.
  15. J

    Mercruiser 3.0 PCM-09 Code 3050

    I posted the full scan results to one of your threads - they are no varying - same for input and output.
  16. J

    Mercruiser 3.0 PCM-09 Code 3050

    Mark - Here are the results from the first scan - Ony 2 O2 sensors so not sure what bank 2 is showing below. Oil pressure shows 0.0 psi but gauge shows 50 psi - still learning the Diacom package. Engine Speed........................................ 696 RPM Bank 1 Long Term...
  17. J

    Mercruiser 3.0 PCM-09 Code 3050

    Mark - Thank you for the recommendation, I will post back results once I get a chance to do that this week after work and re-run the Diacom diagnostic. Jim
  18. J

    Mercruiser 3.0 PCM-09 Code 3050

    I have been doing some more research and from what I can put together if the CAT intake O2 % is the same for intake and outlet this is an indicator that the CAT is bad. Can anyone confirm or correct me on this please? Bank 1 CAT Intake O2 %............................ -12.0 Bank 1 CAT Outlet O2...
  19. J

    Mercruiser 3.0 PCM-09 Code 3050

    Thank you very much for the response, I looked over the OEM guide and provide a few pointers for me but nothing to narrow down a real resolution to the issue. Unfortunately, everything seems to be pointing to a bad Catalyst.
  20. J

    Mercruiser 3.0 PCM-09 Code 3050

    Bondo - I did hook up an aux tank to ensure good fuel was running through and I did replace the fuel water separator filter when I installed new fuel pump.
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