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  1. nola mike

    2001 Mercruiser 5.7 TBI Won't Keep Running

    Are you looking for reference voltage to the sender or sensor output? I mentioned earlier (and I think AD confirmed) the MAP voltage reading on the lower right is the MAP output
  2. nola mike

    2001 Mercruiser 5.7 TBI Won't Keep Running

    Time to start running down that troubleshooting chart that fun times posted. First step is to see whether or not the PCM is getting accurate map readings by plugging in a vacuum gauge. If not, you need to determine what is causing the discrepancy.
  3. nola mike

    Impeller issue on Alpha 1 Gen2?

    Yes
  4. nola mike

    2001 Mercruiser 5.7 TBI Won't Keep Running

    What does the std engine show for a MAP pressure at 600 rpm? With the TPS disconnected the PCM is using a fuel map that guesses the TP.
  5. nola mike

    2001 Mercruiser 5.7 TBI Won't Keep Running

    I'm thinking a bit differently on this. Is that 2.55v the reference voltage, or is it the voltage that the PCM is seeing from the sensor? Easy way to check would just be to rev the engine and see if that voltage fluctuates. To me it seems like the manifold pressure is high at idle, like you...
  6. nola mike

    Alpha 1 gen 2 5.7L overheating

    I think he's actually measuring in cm...
  7. nola mike

    Pressing bearing off of pinion gear

    Problem is you won't know if you have a problem until you explode your drive. Wonder how accurate a small scale beam unit would be
  8. nola mike

    Alpha 1 gen 2 5.7L overheating

    @Scott Danforth sometimes exaggerates about size... I'll say mine sprays out a solid 8 inches though
  9. nola mike

    1990 3.0 Litre: No power to gauges, switches, or engine. Trim works. Help!

    Trim issue might be separate, it's on a different circuit than the rest of the electrical. You'll have to trace out where you lose the 12 volts. Easy first steps would be to check the 50 amp breaker in the engine compartment, and your ignition fuse. No gauges means that you're either not getting...
  10. nola mike

    3.0 Mercruiser Dies On Acceleration

    Tough crowd. OP, your tester stops at max pressure and stays there, regardless of what the pressure in the cylinder does after that point. Cylinder will always lose pressure once you stop cranking. A better test of dynamic sealing ability would be a "real" leak down test that tells the rate of...
  11. nola mike

    Alpha 1 gen 2 5.7L overheating

    Your lesson is backward. You should run on muffs, not in a container. 170' at idle with a 140' stat is way too hot.
  12. nola mike

    1968 Slickcraft 19 foot Just Purchased!

    Did you winterize/drain the block over the winter? Might very well be a big issue.
  13. nola mike

    4 to a 2 barrel carb

    Speaking of which, I have a couple of complete 3.7s. this is strictly for informational purposes, and not commerce. @Scott Danforth
  14. nola mike

    2001 Mercruiser 5.7 TBI Won't Keep Running

    Does second engine idle ok when map sensor is disconnected?
  15. nola mike

    Boat swamped, let's see if we can get it running...

    I don't think I'm into the venturis when this is happening. It's with the throttle barely cracked, and is worse when I try to increase throttle slowly. And if it wasn't clear, it isn't only on acceleration; that just makes it stall if I go slow. It's running like crap if I crack the throttle and...
  16. nola mike

    Boat swamped, let's see if we can get it running...

    Yeah, 1409. Like I said, I used the same jet/spring/metering rod combo all last season. Suspected it was a bit fat, but no real issues. I specifically didn't change any of that just to limit the variables. But my understanding of the carb is how you described it--that is, the idle mixture does...
  17. nola mike

    Boat swamped, let's see if we can get it running...

    Well, I didn't mess with the rods or jets when I rebuilt (just so I could eliminate them as variables if I had a problem). And I'll need to double check, but thought that the idle circuit was active for transition as well. There are for sure ports to supply fuel as the plates open...
  18. nola mike

    Blowby through vent tube? Mercruiser 3.7

    Was that 2 cylinders?
  19. nola mike

    Boat swamped, let's see if we can get it running...

    whoa.... In other news, this is how the day went: Splash! Late in the day before I was able to get out there, so only went about 7-8 miles. Got it up to about 4300 RPM/42 MPH and wasn't into the secondaries but didn't want to push it on day 1. Overall running well. Biggest issue was that it...
  20. nola mike

    Boat swamped, let's see if we can get it running...

    @achris ?
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