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1999 BF130 - Not Running Properly

Is the TPS a potientometer or a hall effect sensor?
It might of been my mates multimeter that was giving the incorrect readings...I will confirm this afternoon but i think it might of been a wild goose chase as i spliced into the TP Sensor and measured the voltage which varied from approximately 1V to 5V. I say approximately because the resolution of his meter was only to a Volt... LOL.
 
So got the manifold gasket and put it all back together. Fired her up with new spark plugs and after resetting the ECM and disconnecting the battery for 15 mins.

Same problem...doesn't want to rev up and just shakes. Sounds like its bogging.
Checked the spark plugs and they are black already. So it's running rich and getting excess fuel.
Cleaned the spark plugs and reinstalled and just let it run at idle...stopped and removed the plugs and they are perfect and not black.

Once you go above idle it is getting excess fuel than required.

About to get a gauge to do my own fuel pressure testing at idle (mechanic said that fuel pressure was fine but I don't trust him) and then watching it as it goes above idle and make sure the fuel pressure stays relatively constant...if it doesn't could it be the regulator or high pressure pump???

Another think I plan on checking is watching all 4 injector pulse signals and seeing if they are correct. Is there a way to check injectors to see if they are putting excess fuel in? Or it could be the signal to the injectors is incorrect or the ECM is not working...

These are my last resorts...

One last thought...If the exhaust passage was restricted could this cause the engine to run rich as the mixture of fuel and air would not be cleared out of the cylinder and then more fuel would be injected and the cycle repeating?
I'm only asking this because when we initially had this problem we were getting some funny stuff out of the exhaust leg. It was salt and crud and if we revved the engine for a period eventually it would clear and the engine would run...

Thanks

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How do you check that? With a pressure gauge?

I removed the return line from the pressure reglator to the VST and fuel flows back at differents levels at various rpm...
 
So far anyone that wants to know...

ITS FIXED!!!

Our one last thought was correct.

The exhaust passage was so heavily blocked with a substance ( Carbon and something???) that at idle the gap was just large enough that the motor could run...as soon as you went above idle the minimal gap caused the engine to run rich due to the mixture that was in the cylinders not being able to exit the exhaust passage way...

We dropped the whole leg and cleaned out all the crud....any ideas what it is or have you seen it before??? There were huge chunks in the exhaust passageway. You could't see it looking up the exhaust unless you had an inspection camera or thought to drop the leg the whole way and actually removing the exhaust pipe and BAM there it was!

Now she is running like a dream and definitely sounds a lot louder than when we first bought the boat!

[URL="http://i65.tinypic.com/1tpjja.jpg%5b/IMG"]http://i65.tinypic.com/1tpjja.jpg[/IMG[/URL]]

[IMG][URL="http://i65.tinypic.com/mja991.jpg%5b/IMG"]http://i65.tinypic.com/mja991.jpg[/IMG[/URL]]

[IMG][URL="http://i63.tinypic.com/2ivl26u.jpg%5b/IMG"]http://i63.tinypic.com/2ivl26u.jpg[/IMG[/URL]]


Plan is to now run a carbon cleaner through the engine and also run vinegar continuously through the cooling passage ways...
 
Thanks for sharing your successful outcome.
Your initial diagnosis in your first post was correct.
So the lesson here is to ensure motors are flushed each time after use in salt water.

Bob
 
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