308 GTS QV losing power and misfiring. | FerrariChat
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308 GTS QV losing power and misfiring.

Discussion in '308/328' started by mikesredferrari, Apr 9, 2017.

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  1. mikesredferrari

    mikesredferrari Rookie

    Apr 8, 2017
    1
    #1 mikesredferrari, Apr 9, 2017
    I have a 1983 Qv it starts up first time great drives (fantastic) then it will lose power/misses ? If I stop and turn it off and restart it right away it then runs fine again. I have also turned it off while traveling along and restarted it and it is back to normal/great.It seems to happen about every 3 or 4 miles.
    What is odd is that it is perfect as soon as you restart it??
    i have replaced the plugs, fuel filter, air filter and the fuel pump is approx a year old.
    Any help would be much appreciated!
     
  2. Brian24

    Brian24 Rookie

    Jan 15, 2009
    27
    #2 Brian24, Apr 10, 2017
    If you can get it missing when idling in your garage check all 8 plugs with a timing light. If any plug isn't firing the light won't flash when on its lead. Examine the plug extender(s) for the failing plug(s). These can give intermittent loss of spark. If in doubt you can swap them front bank to rear bank and with your timing light see it the failing plug shifts. The plug extenders can fail and are often overlooked when diagnosing problems.
     
  3. Arvid

    Arvid Formula Junior

    May 28, 2012
    668
    Norway
    Full Name:
    Arvid Andersson
    #3 Arvid, Apr 10, 2017
    Does it have a lambda sensor ?
     
  4. Owens84QV

    Owens84QV F1 Rookie

    Oct 2, 2001
    4,486
    Somewhere in NC
    Full Name:
    Greg
    #4 Owens84QV, Apr 10, 2017
    Timing sensors? There's 3 of them. At a minimum, pull and clean the magnetic pick-ups.
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,866
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #5 Steve Magnusson, Apr 10, 2017
    +1 that a lot of suspicion should first be on the ignition system for an '83 K-Jet without Lambda (without the additional electrical foo of the with Lambda flavor). Running OK for a few minutes, then failing, and then being OK after shutoff and restarting can also be something thermal (i.e., takes a bit of time to heat up and cools when you shut it off). Does it always consistently "fail", and always after about the same amount of run time?
     
  6. syata

    syata Formula Junior

    Feb 23, 2017
    428
    #6 syata, Apr 10, 2017
    I am not a mechanic...

    Like it was said above. I had a similar issue with my Fiat. The issue was a cracked distributor cap.
     
  7. Archer911

    Archer911 Formula Junior

    Sep 26, 2016
    907
    New England
    Full Name:
    Tim
    #7 Archer911, Apr 13, 2017
    With my 84 308GTS QV it was 2 cracked distributor caps and one broken coil wire.
    I believe it was advice from Steve Magnusson that clued me in. Thank you sir.
     
  8. bentrm

    bentrm Formula Junior

    Sep 17, 2011
    596
    Pittsburgh, PA
    Full Name:
    Rob
    #8 bentrm, Apr 17, 2017
    Just wondering if the issue was resolved.
     

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