tpenfield's latest activity

  • tpenfield
    tpenfield reacted to vroom ZOOM's post in the thread 454 mag mpi chuggles/stalls with Like Like.
    If I can get it to stay running the IAC will go over 100. Check the data files I emailed you with the good and bad engine.
  • tpenfield
    tpenfield replied to the thread 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...
  • tpenfield
    tpenfield replied to the thread 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...
  • tpenfield
    tpenfield replied to the thread 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...
    • Vroom-1.png
  • tpenfield
    tpenfield replied to the thread 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
    • Screenshot 2025-07-28 at 7.25.01 PM.png
  • tpenfield
    tpenfield replied to the thread 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.
  • tpenfield
    tpenfield replied to the thread 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...
  • tpenfield
    tpenfield replied to the thread 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%...
  • tpenfield
    tpenfield reacted to sphelps's post in the thread 1962 Chris Craft Holiday 20’ bucket list resto with Like Like.
    Life is a thing ! Just off a fresh back surgery on Friday . Pain meds starting to kick in . lol ! Hope it works for my incredibly...
  • tpenfield
    tpenfield replied to the thread 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...
  • tpenfield
    tpenfield reacted to vroom ZOOM's post in the thread 454 mag mpi chuggles/stalls with Like Like.
    I dunno... this is what mercruiser calls it... straight from the manual!
  • tpenfield
    tpenfield replied to the thread 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...
  • tpenfield
    tpenfield replied to the thread 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...
  • tpenfield
    tpenfield replied to the thread 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...
  • tpenfield
    tpenfield replied to the thread 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.
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