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  1. O

    7.4mpi just started running rough and with gas coming out exhaust

    UPDATE - I was able to get to the #2 injector so I could get a NOID light on it while running. The NOID light does not blink. It stays on. The wiring that I can see looks to be good.
  2. O

    What does the red kill switch disable?

    I’m certain it disables spark but does it also disable fuel injector pulse signal or disconnect the ECM somehow? I am looking at a 1999 7.4 MPI.
  3. O

    7.4mpi just started running rough and with gas coming out exhaust

    I put the fuel pressure test results in post 12
  4. O

    7.4mpi just started running rough and with gas coming out exhaust

    Should this tell me if the problem is with the ECM or it’s injector driver?
  5. O

    7.4mpi just started running rough and with gas coming out exhaust

    Sounds like tearing it apart first is unavoidable. I was hoping I could narrow it down and be ready to tear it apart and reassemble in the same day. Would an auto OBD2 scanner be useful or not? I wasn’t sure it there’s a connector. Hiring it out is not an option - summer would be over.
  6. O

    7.4mpi just started running rough and with gas coming out exhaust

    The engine had two possible fuel pressure specs I’ve attached. when the key is turned on it would jump to 45 and settle at 41. Turning the key off, sometimes it would hold pressure solid for many minutes. Occasionally it would plummet right to zero. Running, the pressure was 36-37. I...
  7. O

    7.4mpi just started running rough and with gas coming out exhaust

    Thanks. Is it possible for one bad injector to make the entire side run very rich? it’s this style of intake. I hope there are no issues removing the upper plenum in the water. I can pinch the intake hose I guess.
  8. O

    7.4mpi just started running rough and with gas coming out exhaust

    0L354842 That should be it The injectors are difficult to access with the boat running. The upper intake plenum covers everything
  9. O

    7.4mpi just started running rough and with gas coming out exhaust

    UPDATE - I’m not sure it’s just an injector. It runs rough and weak. The entire passenger side plugs are fouled. I’m sure they were wet. The ceramics are black. The 4 on the other side are white. Each cylinder has its own injector in this MPI setup. Can one bad injector foul every single...
  10. O

    7.4mpi just started running rough and with gas coming out exhaust

    1999 7.4mpi 0L854*** 270 Sundancer single engine B3 Just before I was about to pull into the marina on plane my boat started sputtering and missing like it had water in the gas. I dropped it down to about 1k. It idled in running but a little rough. It smelled rich. It wasn’t until I got to...
  11. O

    Voltage completely drops when switch turned to on - No start, no gauges

    1999 270 Sundancer with the 7.4. I went to start it for the first time this year and got nothing at the helm after the first try. The first time just turning the key on I heard several clicks without turning it past run. I turned it off and back on then went to start it and nothing. I have...
  12. O

    How do you know if your lower shift cable needs replacing?

    I was wondering if this is something I should add to the maintenance list. Right now it is not a problem, but the initial hump into forward and reverse feels very firm at the control. Once over the hump, it's quite smooth to just work the throttle. What signs should I look for or how often is...
  13. O

    Can the prop shafts on a Bravo 3 be inspected without full disassembly ?

    I have a Bravo 3 drive that has just now started leaking at the prop area. I only had to add lube to the reservoir once this season. I will soon drain the lube to check for water intrusion. A shop has quoted me $400 for just the seals, but also mentioned it was very likely the prop shafts...
  14. O

    Not your typical exhaust manifold problem - please assess

    This boat has the 1999 L29 7.4mpi (0L354842). (1999 Sundancer 270 wide with single 7.4 B3) It has always been a freshwater boat. Today I ran it on the muffs preparing for Spring launch and I noticed very faint condensation/steam coming from the starboard manifold. It appears to be an issue on...
  15. O

    Anyone have any experience with the Superior brand boats? (compared to Sea Ray)

    I have never heard of this brand. I was looking at a late 80's Superior 21 ft with a cuddy. Nice looking boat with 4 new swivel seats but I've never heard of it. This one has a 3.0 with merc. Seems a bit small but the owner claims it jumps right up on plane and tops out about 41mph. I'm...
  16. O

    What is the thing on the back of some boats that looks like an extendable square foot

    Noob question, but what is it? It looks like it extends. It reminds me of a stabilizer leg on a back hoe. It is mounted above the water line on the stern.
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