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  1. vroom ZOOM

    454 mag mpi chuggles/stalls

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

    454 mag mpi chuggles/stalls

    Ill crank it up today and post the graph.
  3. 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...
  4. vroom ZOOM

    454 mag mpi chuggles/stalls

    ok, I ran the engine a couple of times and generated some graphs.
  5. 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.
  6. vroom ZOOM

    454 mag mpi chuggles/stalls

    Ok, this thing has me beat. 2000 454 mag mpi (mefi3). starts, then when settling to idle it chuggles and stalls. Brand new longblock. old one also did the same thing. I tried known good ignition modules from properly running engines, reset the distributor to #1 tdc countless times, tried a...
  7. vroom ZOOM

    mercruiser 454 MPI Horizon stalling

    I think I will just buy another IAC for $50, they seem to be cheap and readily available. I am pretty darn sure those are adjustable rockers, I think when whoever rebuilt the heads they changed to adjustable rockers. They have the stud with a nut. There was a yogurt container with the old...
  8. vroom ZOOM

    mercruiser 454 MPI Horizon stalling

    Hello Working on this interesting case of a motor. When I started messing with it, the front timing cover was removed, the cylinder heads looked unpainted and had adjustable rockers in them, and the intake manifold had a couple of new bolts. Additionally there where new manifolds and elbows on...
  9. vroom ZOOM

    Painting drive with delfleet

    Hello, I want to try another paint/process for one of my transom plates. I dropped it off to have it laser cleaned so its basically going to be perfectly clean from paint corrosion and grease. I want to etch it with muriatic acid, and then apply alodine. For paint, has anyone tried painting...
  10. vroom ZOOM

    Low Fuel Pressure 2005 Mercruiser 4.3L MPI

    What is the fuel pressure doing if you turn on the pump? What is the reading? What is the reading as soon as the pump turns off? How fast does the pressure drop to 0 after the pump turns off? Did you check for WATER in fuel at the rail?
  11. vroom ZOOM

    Low Fuel Pressure 2005 Mercruiser 4.3L MPI

    Yes. I think you can also use a 3/8 NPT plug. let the pump run a few cycles before looking for air in order for the air that got in while messing with it to get purged. also MAKE SURE to check for water in fuel.
  12. vroom ZOOM

    A motor question on Cristmas day uggh

    I'd fill the holes with some kind of epoxy mixed with fumed silica.
  13. vroom ZOOM

    Low Fuel Pressure 2005 Mercruiser 4.3L MPI

    Hang on, just checked your serial number and it seems that you do not have a LP pump, sorry for the mistake. Most of these do so I blindly assumed you have one. I stand corrected. But still do the clear hose test on the return from the HP pump and the clear hose test from the tank to check for...
  14. vroom ZOOM

    Low Fuel Pressure 2005 Mercruiser 4.3L MPI

    Ugh, you need to do some proper diagnostics to find out what is going on. Don't be a parts cannon (otherwise your dealer parts guy will love you). Here is a little procedure you can follow, I hope it helps: Disconnect the dump line from the cool fuel module at the filter housing. Throw a chunk...
  15. vroom ZOOM

    350 mpi rebuild questions

    Anyways, one down. Still a couple of hoses left to connect when I get the manifolds, but the motor is otherwise complete. Now for the second motor!
  16. vroom ZOOM

    350 mpi rebuild questions

    gotta be careful as play sand will create nasty silica dust in the blasting cabinet. Usually I use crushed glass that is specially made for blasting and doesn't create silica dust.
  17. vroom ZOOM

    Axius Gen 1 Removal

    Well, I will chime in here with my 2c. The thing is, finding parts for gen 1 axius is stupid difficult (I tried, most parts are NLA). However, if parts are needed, I heard that you can install the newer style actuator and reprogram the TVM to slow the new actuator down to the gen 1 speed (will...
  18. vroom ZOOM

    350 mpi rebuild questions

    Well, you internet warriors have convinced me to grab that stainless head gaskets. Got the marine 17030 felpro gaskets for 29 bucks each, so not too bad. Non marine were 15 bucks but its not too bad of a price diff. Picked up new crab caps and belts while I was at it. Hopefully I can get the...
  19. vroom ZOOM

    350 mpi rebuild questions

    Well, I tried communicating to the cooked ECM through K-TAG, but no luck, I think its really toasted. I guess I will keep it around for spare parts. On the positive side, I bought a whole box of 350 mpi ECMs with some good ones to use and some bad ones to tinker with. When digging through them...
  20. vroom ZOOM

    to replace the transom or not?

    Last one took me about 3 or 4 days to do, I could probably do this one in 7 or so, its just that ripping the old wood out is a PITA. I don't really mind grinding or glassing, its getting the old wood out from behind the stringers. Anyways, looks like its time to start cutting.
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