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  1. tpenfield

    FANTASTIC web site !!

    It looks like bacon.com may be available. (y)
  2. tpenfield

    Starting boat after 4 years - pre start steps

    Was the boat properly laid up 4 years ago? The main things that I would do is . . . Take the spark plugs out and squirt some fogging oil into the cylinders, shoot a little fogging oil down the carburetor. Then with the spark plugs still out 'spin' the engine with the starter for a few...
  3. tpenfield

    looking at a 1990 thompson 260 fisherman

    there on some videos of fixing a Thompson 260 . . . I agree with the others, average quality boat now 36 years old, so about double of its life expectation.
  4. tpenfield

    454 mag mpi chuggles/stalls

    Yes, the thing I’m not in love with about the Diacom is that you can only graph 3 things at a time. In the recent test- I may be that the Map value increased because the iac opened up. anyway, I think the OP has the intake/throttle body to look at.
  5. tpenfield

    454 mag mpi chuggles/stalls

    It looks like the initial barometric pressure (Baro MAP) is 30 and the 'good' engine goes down to about 12. The 'bad' engine goes to about 8.5. It also looks like the 'bad' engine was able to keep running if/when the IAC moved all the way up to the 155 range, and so the injector pulse stayed...
  6. tpenfield

    454 mag mpi chuggles/stalls

    Here are some graphs from both the Good and the Bad engine . . . Good . . . . . Bad . . . . . I am seeing that on the 'bad' engine the MAP value goes down lower when the engine revs from the initial start and the IAC valve has to open more to keep the engine running. The lower value of the...
  7. tpenfield

    454 mag mpi chuggles/stalls

    It’s a beach day for me today. I’ll take a look at the files this evening . a good assumption may be that the ECU is responding to the sensor inputs. The question being, what is telling the ECU to make the injector pulse so short?
  8. tpenfield

    454 mag mpi chuggles/stalls

    Just comparing to my 7.4 LX data files. . . wondering about the IAC position . . . looks high on your engine. Comparing the data files of the good engine and the 'troublesome' engine may be helpful. Send them as you are able.
  9. tpenfield

    454 mag mpi chuggles/stalls

    You mentioned a new long block and the previous engine had the same issue. Did the intake manifold come from the old engine to the 'new' long block? (sorry if that was already discussed)
  10. tpenfield

    454 mag mpi chuggles/stalls

    Here are the engine speed, injector pulse, and MAP as a graph. Overall the injector pulse looks low. MAP also looks fairly low. Maybe send me a similar file from your 'good' engine for comparison. . .
  11. tpenfield

    454 mag mpi chuggles/stalls

    Here is a Diacom reading from my 7.4L LX engine at idle, similar ECT. . . . Notice the difference in injector pulse and the MAP
  12. tpenfield

    454 mag mpi chuggles/stalls

    It might be good at this point to list out the things that you have not replaced or swapped out with the other engine.
  13. tpenfield

    454 mag mpi chuggles/stalls

    I'm seeing the injector pulse width drops below 2.0 ms, which I think is low for an engine not at its operating temperature. So, in a way your engine is being fuel-starved within seconds after starting. It would be interesting to figure out what other sensor inputs would cause the injector...
  14. tpenfield

    454 mag mpi chuggles/stalls

    @vroom ZOOM . . . I got your Diacom file . . . Not a lot of data from an MEFI3. I am wondering if you set the throttle to about 5% and start the engine, will it stay running.?
  15. tpenfield

    454 mag mpi chuggles/stalls

    It would be good to have the Diacom connected and recording when you do these tests. Lots of folks go through endless frustration swapping and throwing parts at MPI engines.
  16. tpenfield

    I Got Me a Mercury !!!

    A couple of updates to the Mercury saga . . . The engine would not cold start. If I did a spray of fuel into the carburetor it would fire right up. So, I took the carburetor apart and did some cleaning. It did not look bad at all and had evidence of previous maintenance. After some...
  17. tpenfield

    454 mag mpi chuggles/stalls

    BTW - I had to Google "chuggles" . . . "Chuggle" can refer to two main things: a type of dog breed or the act of drinking something quickly. As a dog breed, a "chuggle" is a cross between a Chihuahua and a Puggle (itself a Pug and Beagle mix) Perhaps your engine is 'drinking too quickly' . ...
  18. tpenfield

    454 mag mpi chuggles/stalls

    OK, since you have the Diacom software, my suggestion is to connect it when the engine is running (i.e. cooperating) record a few minutes of data, Then do the same when the engine is not cooperating. (you won't get much data, but run it while you are cranking the motor, etc.) I would expect...
  19. tpenfield

    2006 Volvo out drive thumping

    That might be a @Scott Danforth question. If I had to guess, I'd say it is about the amount of torque.
  20. tpenfield

    2006 Volvo out drive thumping

    I know the Bravo drives are ok in shallow waters at idle speed. Maybe others not so much.
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