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  1. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Hi. The sparks are blue and white and strong. Once in a while, I see a yellow one. The carburetor float height and float drop adjusted to exact mm listed in the Mercruiser service manual, with no effect to this situation. Rebuilding the carburetor actually did nothing to make things better...
  2. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Hmm, Not seeing any vacuum lines on this engine. The Mercury service manual mentions using a vacuum gauge connected to engine, but fails to describe how to connect the two together. The only place it mentions there is a vacuum is at the base of the carburetor. Still cobbling fittings together to...
  3. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Alright, Once I get the fuel pressure gauge installed inline, I will spray some carburetor cleaner at the base and listen for a change in RPM's. I watched that video of that TKS 4.3L. That 4.3L engine in the video is quite different than my 3.0L , with his cap being behind the carburetor, and...
  4. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Hello, I searched in my Mercury service manual for an "exhaust shutter" and nothing came up. It does mention "Flapper", -as such: "Sometimes noises can be caused by moving parts coming in contact with other components. Examples are: flywheel or coupler; exhaust flappers rattling against exhaust...
  5. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    I was at the dock two weekends ago, and the motor would not cold start. Battery was at 13.5V. We sat there about 5 minutes and a crowd had gathered after hearing the starter motor working with no ignition taking place. I had my tool bag, went over to the idle screw and gave it 1, then 2, then...
  6. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Yes, I used compressed air, close to 50psi with a fine tip if I recall. I hesitated to use wires, since back on motorcycles rebuilds they said you could damage the white zinc metal passages if a wire was used. - Regardless, rebuilding the carb did not seem to improve or make worse the situation...
  7. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    I just ordered the 15psi gauge kit that you posted. I will surely have to cobble some fittings together, as I read that the 2-barrel TKS carburetor was listed as using the NPT standard for inlet threads and not the AN threads. Can anyone confirm, as my quick connect to the carburetor inlet does...
  8. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Hello ESGWheel, I appreciate you and others hanging in there while I try to sort this out. 1. "Like Ringing a Dinner Bell" Sorry, its a slang term for when a crowd gathers. Seems like anytime I have trouble at the dock, I get a lot of unwanted attention, and irrelevant advice. 2. Adding Marvel...
  9. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Ran the tests this afternoon: 1. Garage smoked like a KISS concert in 1978 due to 1 oz of Marvel Mystery Oil per cylinder for 24 hours +. 2. Spark gap test tool showed good blue spark at 6.35mm (1/4") on all 4 cylinders,. Once in a while the spark was yellow (does that mean that the coil is on...
  10. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Just to point out to all and Thanks - I am getting on the water, its just not 100% where it should be. Maybe somewhere between 75%-85% overall right now. In NE Ohio now, we only have about 3 weeks left before most all go into storage. Cold starts at the dock/launch are embarrassing now. It's...
  11. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    I stated in OP that I did not test the fuel pressure.
  12. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    That is very close to what I ran in my Ultrasonic cleaner for this carburetor. I used the Zep equivalent - Concentrated All Purpose green liquid de-greaser. Thanks,.
  13. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Guys, I will repeat that test with removing each spark plug wire while running checking the RPM's, and report back here. It was over a month ago , and a few other changes took place since that was tested.
  14. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Uggh.. that is above my pay grade. Isn't there a better way to check for a stuck valve? Would not the compression measurements be off if there was a valve that was sticking? All 4 psi measurements were very close. I will try a spoonful of Marvel Mystery Oil in each cylinder before I tear the...
  15. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Yes, agreed something was off, and still is. I will go back to 2 turns out, then let it warm back up and check it again. I used an ultrasonic cleaner on carburetor venturi and as many smaller pieces that would fit in my 7" cleaner. I did not want to soak the whole carburetor body in a can of...
  16. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Oh, Yes, now with the words "Adjustable, and 'Jumping" added, I was able to locate one: https://www.walmart.com/ip/Convenient-Ignition-Coil-Diagnostic-Test-Tool-with-Adjustable-Gap-Distance/14582409093. I will get that..so for this engine, I am looking for a blue spark that just has to jump at...
  17. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Hi, Yes, the total advance met what the service manual was calling for, in that range. I will go back to the air/fuel mixture screw # of turns again. I also initially thought that 4-5 turns out was turned too far out, but I made that adjustment in the middle of the lake, as it was recommended to...
  18. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Hello, The manual that I am using is very similar & same part #, but the full version of https://www.aservicemanualpdf.com/Samplepages/Mercury%20Mercruiser%20Marine%20Engines%20GM%204%20Cylinder%20181%20CID%203.0L.pdf
  19. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

  20. GeorgioP07

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Would it be worthwhile to just replace the ignition coil at this point? It appears to be the original, though, it is definitely producing spark, but enough? I don't think that this distributor has points nor a condenser being EST-based. Thank you.
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