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There aren't many places water can get in on a Bravo, I'm not all that familar with the Alphas. If the drive shaft bellows and gear shift cable bellows have been replaced, there is not much left. The transom seal "O" ring. The seal where the trim sender and limit switch wires come thru...

The 2 bottom transom bolts are worth a check. They are the only bolts that go thru the hull. They are alloy and corrode away. This is where I had a leak and took months to find. Eighteen years in salt water ! Here is a picture. I replaced mine with 316 SS Check and see if the nuts...

Unfortunately, I didn't get to look at the boat today, the owner has been delayed in Brisbane, so it looks like things will happen tomorrow. I was in doubt about the year, as the TBI's finished in 2001. It may have been the boat came to Australia in 2005. Like I said in my initial post...

Ron, These Delphi MEFI ECU's are pretty primitive compared to the ones on the GM autos. They are lacking the O2 and Mass Air Flow sensors and you can't reprogram them without dumping the entire Eproms. Everything is in the lookup tables to the extent that the injectors are sized to suit each...

I think tomorrow, I'll check the fuel pressure and then blank off the EGR line and see what happens. At least that will take a few variables out of the equation. One good thing is that there is a perfectly good motor on the starboard side, with plenty of good spares. BTW, We call that...

That regulator in the Throttle Body is a pressure dampner, suppose to take pressure spikes out of the system. There is a little vent tube coming out of it, but with the motor running, there is no fuel coming out of the vent. The main pressure regulator is down on the fuel pump / fuel cooler...

Ok, I'm back 7:30 Sunday night ! Had a great trip :thumbsup: So, here is my thinking, heaps of black smoke = too much fuel OR not enough oxygen. If we assume the electronics are OK and the injectors are OK. And there is no way of measuring the O2 in the exhaust as the system is open loop...

It's Saturday morning, and me and the Admiral are taking Solitude for a 40 mile run up the Western side of Fraser Island to go whale watching, so I won't get back here 'till Monday morning, that will be Sunday afternoon your time. Anyway, I'll chew all this over while I'm away and make another...

I had similar thoughts about the ECU, it could be calculating 2.4ms pulses and showing that on the scan tool but if the output transistors were going bad, the pulse on the injector could be greater. Then, like I said above, I thought I would be able to see the extra fuel going in. I'm starting...

Yep, this motor has PCV and EGR, and it was a thought I had 2 days ago because when you look at the fuel flowing onto the throttle plates on both motors, they look about the same. My thoughts then were that you should be able to see a difference, I mean, with the amount of black smoke, you would...

I took an oil sample today, and it was as black as ink and about thin as diesel, so we pumped the lot out and topped her off with fresh. Fortunately the motor has not been under any load but who knows what as been going on with cam followers etc. I have an idea the owner took it out for a...

I went through the manual again tonight (Friday) and checked off all the tests we have done. Only ones left are the fuel pressure and changing out the injectors. At the end of every test procedure and the problem still exists, they say to replace the ECU. I think they're about $AU3000 here, so...

Yep, we changed over the MAP sensor. I can handle the pressure test OK. I have a gauge for the 454 MPI, but I'll have to make up a fitting to suit the TBI system. There is no test point on the TBI whereas the 454 has the schrader valve on the front of the block. We also checked the vacuum...

At our marina, we have floating pontoons, slips, I think you guys call them, and I back the boat in. I’m having a nice quiet day, sitting on the pontoon, feet in the water, new propeller sitting next to me at the back of the boat. The marina manager is wandering around and comes up to me and...

This one has got me stumped ! First up a bit of history. This is a new boat to our marina, a 2005 Champion 925 with twin 5.0L TBI Mercs driving B1’s Raw water cooled, and it’s the owners first “big” boat. It was shipped 1000 miles up here by road. The owner did have a sea trial and “it seemed...

Just a quick note, my 383 burns 50L /hr or 13.2 US gallons / hour at 25 knots. That is 2L / nm. There is a 4bbl Weber on my 383. The boat weighs in at just on 4.5 tons loaded. At WOT she'll burn 90L/hr or 24 US gallons / hour. I have a fuel management computer on board and it has been...

Assuming for the moment that both motors are in good tune. Then the motor that is burning more fuel must be doing more work. Simple physics. If the motors are doing the same RPM's and one is doing more work and thus burning more fuel there must be a miss match between the motors and the...

No, it was flooded. Seems you need the fibre block.

This is a common problem when the motor is hot. But you didn't say weather the motor is cold or hot when it is hard to start. If it is hard to start when hot, it is because the fuel evaporated out of the carb and flooded the motor and full throttle is needed to clear the flooding. I had the...

Here is a little tip for those hard to find leaks. Do as Dennis says and get the motor realy clean. Then sprinkle talcum powder all around the places where you think the leak may be. There are not many places a SBC can leak oil. Valve covers, Distributor mounting gasket, pressure sender...