84 308 QV sudden misfire and stalls | FerrariChat
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84 308 QV sudden misfire and stalls

Discussion in 'Technical Q&A' started by PCosta, Jul 31, 2009.

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  1. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #1 PCosta, Jul 31, 2009
    I've replaced the plugs about two weeks ago because of misfiring. The car ran great there-after and no misfiring. Problem solved, right! Today, I had a ½ a tank of gas so I filled up with Shell 93. Coming home after about 12 miles of driving, I noticed a sudden misfire and then once I arrived in my garage she stalls. I couldn't get the car restarted, she would turn over but that’s about it. I went out a few hours later and check all my wires. I noticed one wire not in all the way so I pushed it down. Tried again and she started right up. I let the car run a bit but the smell of the exhaust was so bad and it started to burn my eyes. Any suggestion?? One more thing when it’s warm out, (this happened a few times) the car would just cut out. I‘ll be doing 70MPH and down she goes, radio and all. I would wait a few minutes, then the car would start but other times I would wait a half hour or more. What could cause this? Thanks for your help.
     
  2. 308GTS

    308GTS Formula 3

    Dec 27, 2001
    2,223
    TN
    #2 308GTS, Jul 31, 2009
    Check both coil wires, coils and your flywheel sensors. Sounds like your loosing an entire bank.
     
  3. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #3 PCosta, Jul 31, 2009
    I also noticed this morning the battery light stays on until I rev it and then shuts off. What does this mean?
     
  4. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #4 PCosta, Jul 31, 2009
    Coil wires are good and fly wheel sensor is buzzing.
     
  5. Lawrence Coppari

    Lawrence Coppari Formula 3

    Apr 29, 2002
    2,192
    Kingsport, TN
    Full Name:
    Lawrence A. Coppari
    #5 Lawrence Coppari, Jul 31, 2009
    My 328 has done that for the 21 years of ownership. My understanding is that they are supposed to do that. A rev up to about 2500 gets mine to shut off. I do not know the technical reason for it. It is unlike other vehicles.
     
  6. climb

    climb F1 Rookie

    Sep 19, 2006
    4,866
    Atlantic Beach Fl
    Full Name:
    Stuart K. Hicks
    #6 climb, Jul 31, 2009
    Just wonder what you mean by buzzing. I have a misfire too and after replacing all extenders/plugs/wires i'm looking to the sensors next. how do you test this?

    Check the digiplex grounds and add new ones to the rear mounts of the digiplex mounting brackets.
     
  7. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #7 PCosta, Jul 31, 2009
    Thank you for your post. So I don't have another issue on top of the others.
     
  8. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #8 PCosta, Jul 31, 2009
    Climb: I just listen for it. It's difficult to explain over email, it just buzzes.
     
  9. climb

    climb F1 Rookie

    Sep 19, 2006
    4,866
    Atlantic Beach Fl
    Full Name:
    Stuart K. Hicks
    #9 climb, Jul 31, 2009
    Last edited: Jul 31, 2009
    I see..thanks.

    Mine works great 'till the car gets warm then starts sputtering in the 3-4k rpm range but pulls fine before it's fully warm. I'm wondering if my sensors cut out when they get hot.

    Have you changed/checked the little carbon tips in the distributor and the springs underneath? One of my springs was rusted so bad it fell apart in my hand.
     
  10. pad

    pad Formula 3

    Sep 30, 2004
    1,426
    Tequesta, FL
    Full Name:
    Paul Delatush
    #10 pad, Jul 31, 2009
    In that the radio dies as well, I would suspect a ground issue or an ignition switch / circuit problem. Also, if you have an alarm system, bypass it until all issues are resolved.
     
  11. CliffBeer

    CliffBeer Formula 3

    Apr 3, 2005
    2,198
    Seattle, Washington
    Full Name:
    Cliff
    #11 CliffBeer, Jul 31, 2009
    PCosta, I suspect you have a partially melted fuse box - very common problem on a Mondial. Perhaps the fuel pump isn't getting power or something similar. I'd definitely take a very close look at the fuse box and all the connections.
     
  12. 308GTS

    308GTS Formula 3

    Dec 27, 2001
    2,223
    TN
    #12 308GTS, Jul 31, 2009
    The flywheel sensors don't buzz. You check the resistance on them to test them. Frequency valves buzz.
     

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