Search results

  1. vroom ZOOM

    454 mag mpi chuggles/stalls

    Well I am completely pulling my hair out. Will call the place I bought the motor from and see what they have to say. Its fair to say I have tried every single part from the other engine other than the longblock and it still wont run. I also tried removing the mufflers to see if there maybe was...
  2. vroom ZOOM

    454 mag mpi chuggles/stalls

    no, clear bright red.
  3. vroom ZOOM

    454 mag mpi chuggles/stalls

    Did more troubleshooting today. I think at this point I am starting to consider some kind of issue in the transmission. it is a velvet drive 5000v. Is it possible for it to fail such that it somehow tries to engage forward and reverse at the same time and stalls the engine out?
  4. vroom ZOOM

    454 mag mpi chuggles/stalls

    No damper. This is a MAG, not an L29. Serial number is 0L394105, sorry for not posting it earlier.
  5. vroom ZOOM

    454 mag mpi chuggles/stalls

    well, started doing stupid stuff cuz thats all I have. Swapping the fuse cube swapping the starters running the engine directly off booster cables to the battery checked the lifter preload tried wire harness swap again tried distributor swap again tried swapping spark plugs from one engine to...
  6. vroom ZOOM

    454 mag mpi chuggles/stalls

    Yes, I guess the temp went down a little as it started pulling air through the plenum.
  7. vroom ZOOM

    454 mag mpi chuggles/stalls

    Put the voltmeter on the tan wire from the ECM with the IAT unplugged. Started the engine and the reading stayed around 5.2 volts. Also wasn't able to get the meter on the wire with the sensor plugged in but here are the diacom readings from the sensor with the engine running. ECT sensor paints...
  8. vroom ZOOM

    454 mag mpi chuggles/stalls

    I have a rec file. Will send it to you via pm
  9. vroom ZOOM

    454 mag mpi chuggles/stalls

    I only swapped the upper part of the intake with the sensors and throttle body. And yes new gaskets if any were torn. No parts swapped had any effect, except for the injectors. Today I decided to try swap injectors again. What do you know, the engine fired up and ran perfectly for about 2...
  10. vroom ZOOM

    454 mag mpi chuggles/stalls

    took them out, looked a little sooty but all the same.
  11. vroom ZOOM

    454 mag mpi chuggles/stalls

    I dunno... this is what mercruiser calls it... straight from the manual!
  12. vroom ZOOM

    454 mag mpi chuggles/stalls

    oh jeez.... Just spent the entire day in the engine room testing every possible circuit on the wire harness, and no luck. I even took some pins out of the ECM plug and did static tests on the injectors, each one pulled 0.75 amps through the wire harness and directly, indicating a good...
  13. vroom ZOOM

    454 mag mpi chuggles/stalls

    Well DAMN! I spoke too soon. As soon as the boat hit the water, the motor is back to its old self. I checked the contacts on the injectors and now that doesn't help. I swear this thing is cursed. Restart the suggestions!
  14. vroom ZOOM

    454 mag mpi chuggles/stalls

    Well everyone, it is FIXED!!! FINALLY! you are not going to believe what it was... The fake injectors had the pins in the connectors slightly off center, and they made better contact with the terminals in the socket that had taken a "set" and had a loose connection. So the fake injectors made...
  15. vroom ZOOM

    454 mag mpi chuggles/stalls

    no unfortunately I dont. I really didn't record anything as the engine ran amazing. Will do that today.
  16. vroom ZOOM

    454 mag mpi chuggles/stalls

    no, iac is around 50 counts.
  17. vroom ZOOM

    454 mag mpi chuggles/stalls

    Ill crank it up today and post the graph.
  18. vroom ZOOM

    454 mag mpi chuggles/stalls

    Well here is a REAL head scratcher: I put the cheap knockoff set of injectors in it that the other running engine had last week and that made the engine run PERFECTLY. I thought that the injectors were bad so I ordered a new OEM set. I put them in and it runs like crap. A few hours ago I decided...
  19. vroom ZOOM

    454 mag mpi chuggles/stalls

    ok, I ran the engine a couple of times and generated some graphs.
  20. vroom ZOOM

    454 mag mpi chuggles/stalls

    Yes I plugged the pcv valve when I put the vac gauge on it. No change. Will try it again and post screenshots of diacom. I tried the harness from the working engine, no change.
Top