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  #61  
Old 09-16-2021, 09:43 PM
curver900 curver900 is offline
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I'll ask and maybe you did it already but can you pull the plugs that are loaded and then go turn the key ? if it is to much fuel which it sure looks like then those should stink allot like fuel.. maybe you can shine a light in there and see if they are wet ...or leave the plugs in and do that pull them all and see which ones are wet if any? I don't know what it would prove or not other than it would be some data...

maybe eliminate or confirm that the pressure drop is due to the injectors..
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  #62  
Old 09-17-2021, 01:41 AM
chrislandy chrislandy is offline
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Originally Posted by jpwhit View Post
[*]Connecting the boat to a computer is not just about checking for codes. There's a ton of other info available and actions that can be performed via a full feature diagnostics system. Even bad mechanics using a full featured diagnostic computer will do more than just read codes. I have the full blown commercial Rhinda Diacom suite of tools. I could tell you so much data if I had it connected to a running boat that it would make your head spin. [/list]

Exactly, dealers are known for plugging it in, seeing no codes, then saying "all is fine", give me $200



now you've said 75% surfing, my hypothesis is:

It's a 20ish yr old boat, surfing basically didn't exist then. There is a good chance that within the map, that section of the load table wasn't mapped properly as it was never envisaged that the boat would be doing 8-11mph with 3k of weight on boat i.e. that particular engine load at that particular RPM, there are areas of a fuel map that use "throwaway" figures to fill the table where the injector time either levels out, rises steady, or lowers steady depending on the adjacent cell.
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  #63  
Old 09-22-2021, 10:00 AM
88 PS190 88 PS190 is offline
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Unplug the ECT and run it - see what it does.
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  #64  
Old 09-22-2021, 02:09 PM
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prostar205 prostar205 is offline
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Originally Posted by 88 PS190 View Post
Unplug the ECT and run it - see what it does.
I will do that this weekend.
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  #65  
Old 09-22-2021, 02:11 PM
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prostar205 prostar205 is offline
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Another idea on the fouled plugs.

I use anti-seize on the threads when replacing plugs. Could some of that material get into the combustion chamber and foul the plugs? I just ordered another set of plugs and will install them without any anti-seize and see if things change.
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  #66  
Old 09-22-2021, 03:37 PM
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brucemac brucemac is offline
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I would classify them as being "Jeff Bezos" rich.


Hope you get it sorted soon. That would be incredibly frustrating.
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  #67  
Old 09-22-2021, 04:10 PM
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waterlogged882 waterlogged882 is offline
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Quote:
Originally Posted by prostar205 View Post
Another idea on the fouled plugs.

I use anti-seize on the threads when replacing plugs. Could some of that material get into the combustion chamber and foul the plugs? I just ordered another set of plugs and will install them without any anti-seize and see if things change.
I say no.

I have no dog in this race but am following with interest.

.
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  #68  
Old 09-22-2021, 04:40 PM
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lakedrum03 lakedrum03 is offline
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Originally Posted by waterlogged882 View Post
I say no.

I have no dog in this race but am following with interest.

.
I am with WL. Even if there was a big ol' glob at the at end, it would burn off pretty easy.
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  #69  
Old 09-22-2021, 05:15 PM
RDahler RDahler is offline
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I put a small amount anti-seize on the threads of the spark plugs of my daughter's car per the GM service manual. It started and ran fine for about a mile from my house and fouled out all the spark plugs. I had to have it towed back to my house. Put the old plugs back in fixed the problem. After a lot of research I found out that spark plugs with plating on the threads should not use anti-seize. The plating will let the anti-seize leach down the threads and short the plugs.
I have put anti-seize on every Aircraft spark (no plating on the threads) that I had ever changed never had a problem. Hope this helps.
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  #70  
Old 09-22-2021, 08:13 PM
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prostar205 prostar205 is offline
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At this point in time, I will try anything to solve this problem. I'll report back on Sunday after I change the plugs on Saturday and take the boat to the University of Washington football game. The Greatest Setting in College Football.
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