Engine misfires in mid range

Discussion in 'General Discussion' started by Flytrade, May 8, 2020.

  1. Flytrade

    Flytrade Active Member

    212
    Feb 20, 2018
    Bradenton, FL
    2006 320 Sundancer
    Twin 6.2L Mercruiser
    This is now day 29. In my previous post I thought I had good news. Not so fast. I checked with MarineMax to see if they received the computer, and they informed me it’s out of stock and they will not get it until the 15th. This is not what I was told last Thursday from MerCruiser tech-support. They said the computer I need is in stock in Atlanta, but they stock the computer in basic form which must be programmed to my engine. Apparently MarineMax does not know this. I have asked Tech Support to give MarineMax a call and get this straightened out. Is there any other little thing that can go wrong?
     
  2. Flytrade

    Flytrade Active Member

    212
    Feb 20, 2018
    Bradenton, FL
    2006 320 Sundancer
    Twin 6.2L Mercruiser
    The saga is over. Day 39 and I got the boat home. Here is a summery of what I have learned in the hopes it will help others in the future.
    1. MarineMax claims they have factory trained technicians, but you couldn't tell it by me. They spent 7 hours to find a part that did not fix the problem. Then they wanted to order a wiring harness, which again would not fix the problem.
    2. Rather than waste time and money throwing parts at the problem, they should have called Mercruiser Tech Support to get higher help in solving the problem when they could not find an immediate fix.
    3. Looking back on all this, I should have been smart enough to call Tech Support myself once my mobile marine mechanic could not find the problem. They would have pointed me to the computer, which my mechanic could change out with the other engine in a few minutes. Problem solved in min time and money, without getting MarineMax involved.
     
  3. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    What what was the $70 communication box all about?
     
  4. Flytrade

    Flytrade Active Member

    212
    Feb 20, 2018
    Bradenton, FL
    2006 320 Sundancer
    Twin 6.2L Mercruiser
    I don't know. I told them I would not pay for their OJT on my boat, and parts that will not solve the problem.
     
  5. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    IF you do pay for the part, you are entitled to (and they are required to give you) get the old part back.

    If an item is replaced under warranty, then you are not entitled to get the defective part back.
     
  6. Seabass SLX

    Seabass SLX New Member

    2
    Sep 14, 2020
    SLX 270 8.1 DTS
    8.1 DTS Mercruiser
    Hi Flytrade,

    I am a new Club Searay member and am experiencing the exact issue you outline above. I finally came across your post which reignited some hope that I could fix my problem. Smartcraft gauges on a 8.1 DTS Mercruiser. Miss in the midrange, speedo goes to zero And lost engine comms fault message on the Tacho readout. We have tried a number of things to resolve while reproducing the problem while the diagnostics computer is connected. Cannot pick up any errors through the laptop diagnostics even watching all sensors under slow motion when the problem occurs. We have disconnected the Pitot, disconnected the trim tabs, disconnected transducer etc, replaced throttle control and PCM, cleaned all connectors and so on, and the problem still occurred. I finally came across your post and we are now going to swap over the ECM to see if that fixes the problem. Let’s hope so based on your experience. Will repost hoping it will be with good news and thanks for posting your experience and giving me some hope that this issue might get fixed.
     
  7. highslice

    highslice Well-Known Member

    Mar 28, 2008
    Table Rock Lake, Hollister Missouri
    270 SLX
    2013 Sea Doo 155 Wake
    496 Mag
    Bravo III
    Corsa
    I'm sorry I found this thread a few months too late. I had the "lost engine com" fault twice on my 240. Both times the MM service manager had my try a hard reset. Both times that failed to fix the problem. Both times replacing the ECM fixed the problem. Fortunately I had an extended warranty from Mercury and they picked up the tab for both ECMs. Total down time was about 4 days.
     
  8. Seabass SLX

    Seabass SLX New Member

    2
    Sep 14, 2020
    SLX 270 8.1 DTS
    8.1 DTS Mercruiser
    Hi Highslice, thanks for that insight. Seems like the ECM is the part to hone in on based on this thread so hoping the ECM fixes my problem as well. Will re-post once i know more. Thanks
     

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