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Engine dies, then backfires

Discussion in 'Boxers/TR/M' started by copyboy, May 19, 2008.

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  1. copyboy

    copyboy Karting

    Aug 31, 2004
    58
    columbus, ohio
    Full Name:
    Mike T
    #1 copyboy, May 19, 2008
    Looking for some help. I was driving my 83 BBi, going along at a steady 55 mph, and the engine just died. A few seconds later then it backfired. Coasted into a parking lot, and it fired right up and no other problems. This is the 3rd time in about 8 months this has happened, and I have driven it about 20 times. Always at lower speeds, when coasting or holding steady speed. Any help would be appreciated.
     
  2. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    3,373
    #2 vincenzo, May 19, 2008
    flame out! sounds like something that would happen in a U2 at 80,000ft - except for the parking lot...

    can't add any input beyond guesses at this stage... but 'backfire' infers to me that fuel is still going into the system. I'd initially start a stem to stern ignition check. No doubt others can add better input - sorry.

    Good luck,
    Vince
     
  3. GaryReed

    GaryReed F1 Rookie

    Feb 9, 2002
    3,127
    Seattle
    Full Name:
    Gary
    #3 GaryReed, May 19, 2008
    It sounds like your Dinoplex ignition box is starting to go bad. They are very prone to failure.

    My Boxer started doing the same thing you described and then the box totally died and the car would barely run and kept backfiring.

    Replace it with an MSD igntion box and an MSD coil. Inexpensive and easy to find. The best deals I have seen on them is at Summit Racing.

    http://store.summitracing.com/partdetail.asp?part=msd-6200

    If you want a built in rev limiter, then go with the MSD 6AL unit, but you will need to send it to the MSD factory to have it modified to work with a 12 cylinder engine. Last time I checked, they charge $35 to do that.
     
  4. copyboy

    copyboy Karting

    Aug 31, 2004
    58
    columbus, ohio
    Full Name:
    Mike T
    #4 copyboy, May 19, 2008
    Gary,

    Thanks for the help. Is there a good way to "disguise" it so that it looks factory?
     
  5. ross

    ross Three Time F1 World Champ
    Owner Silver Subscribed

    Mar 25, 2002
    37,981
    houston/geneva
    Full Name:
    Ross
    #5 ross, May 21, 2008
    had the same recently. turned out to be just a blown fuse for one of the fuel pumps
     
  6. GaryReed

    GaryReed F1 Rookie

    Feb 9, 2002
    3,127
    Seattle
    Full Name:
    Gary
    #6 GaryReed, May 21, 2008
    Last edited by a moderator: Sep 7, 2017
    PermaTune sells Dinoplexs that are hollowed out and have modern electronics hidden inside, but
    I believe they cost $2,000+

    My mechanic mounted the MSD unit on an aluminum plate and used the existing mounting studs that are on the firewall to attach it. He also added a male electrical connector to the MSD wires, so that the MSD plugs directly into the factory female wiring connector.

    Clean and simple. The MSD unit can be unplugged and pulled out in a matter of minutes.
    Image Unavailable, Please Login
     
  7. Murph

    Murph Formula 3

    Apr 26, 2004
    1,542
    SoCal
    Full Name:
    Kevin
    #7 Murph, May 21, 2008
    I had the same problem.
    Mine turned out to be a bad fuel pump.
    Check the fuel pump fuses first.
    I already had the MSD in my car when this happened.
     

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