308 carburated random loss of power | FerrariChat

308 carburated random loss of power

Discussion in '308/328' started by Kingkitesurf, Nov 6, 2021.

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  1. Kingkitesurf

    Kingkitesurf Rookie

    Nov 22, 2015
    7
    Netherlands
    Full Name:
    Job
    #1 Kingkitesurf, Nov 6, 2021
    I have a 1977 - 308 carburated EU version that sometimes runs smooth but after a random while suddenly loses power. I am not sure if it is at specific warmed up temps but it is never at the cold start. In the mountains at hillclimbs it worsens. It also idles rough when this happens, like it misses a few cylinders. The engine has been recently overhauled and compression when cold is good (did not yet measure warm let alone hot).
    It can only be ignition or fuel delivery I would think. Does anybody have suggestions where to look for?
    Thanks.
    Job
     
  2. jpl

    jpl Formula Junior

    Dec 4, 2003
    349
    Yulee Florida
    Full Name:
    JP Lavigne
    #2 jpl, Nov 6, 2021
    Check your fuses and fuse box. Had the same issue. Traced back to fuel pump fuse.
     
  3. 208 GT4

    208 GT4 Formula 3

    Dec 27, 2003
    1,764
    Brighton (UK)
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    Dan
    #3 208 GT4, Nov 6, 2021
    Ignition amplifiers under the coil, although this is usually only a problem when everything is warmed up. Like after 20 mins driving.
     
  4. George Vosburgh

    George Vosburgh F1 Rookie
    Silver Subscribed

    May 26, 2011
    4,111
    Pittsburgh, PA / Chautauqua, NY
    #4 George Vosburgh, Nov 6, 2021
    Distributor?
     
  5. derekw

    derekw Formula 3
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    Sep 7, 2010
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    London, UK
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    Derek W
    #5 derekw, Nov 8, 2021
    When it starts dying, spray starter fluid or petrol into the air intake and if it improves its fuel. Put a timing light on each plug wire and see if both banks are firing. I've had coils die when they are hot and ignitions that are only just getting a signal with cold wires, die when wires are hot (are both your VR sensors in the distributor good and positioned correctly? the pulse may be marginal and die when the the wires are hot.)
     
  6. tuttebenne

    tuttebenne F1 Rookie

    Mar 26, 2003
    3,189
    Bay Shore, NY
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    Andy
    #6 tuttebenne, Nov 12, 2021
    I don't think there are ignition amps on a carb 308. Check that the weights in the distributors are not stuck or sticking.
     
  7. Hannibal308

    Hannibal308 F1 Veteran
    Rossa Subscribed

    Jan 3, 2012
    6,314
    Kahuku / Cottonwood / Prescott
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    Will
    #7 Hannibal308, Nov 12, 2021
    Rich AFR gets worse when it’s hot?
     

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