Very Odd - 84 308 QV Spark Plug Extenders | FerrariChat
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Very Odd - 84 308 QV Spark Plug Extenders

Discussion in 'Technical Q&A' started by PCosta, Aug 1, 2009.

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  1. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #1 PCosta, Aug 1, 2009
    Last edited: Aug 1, 2009
    My car has been misfiring lately. I changed all the plugs and it helped, but what I noticed was one of the extenders is red 105MM. All the others are black 100mm. I had new wires, extenders, and plugs replaced about 3 years ago and it ran well up to this season. My question is, why would someone use one red extender? Any other reason than they had it in the shop and didn't want to order the black ones? Is it recommended to mix the two? Any recomendation for replacement?

    Thanks,
     
  2. Newman

    Newman F1 World Champ
    Consultant Owner Professional Ferrari Technician

    Dec 26, 2001
    14,448
    Canada
    Full Name:
    Newman
    #2 Newman, Aug 2, 2009
    Should all be red and the resistance value is different from black to red. Black is for the older carbed cars. Has to do with RFI effecting your digiplexes.
     
  3. First Ferrari

    First Ferrari Formula Junior

    Jun 18, 2005
    523
    Mahtomedi,MN
    Full Name:
    Christopher Reeves
    #3 First Ferrari, Aug 2, 2009
    From memory my 80 308 GTSI had black extenders not the red that was mentioned earlier. I don't know about the values but it does seem strange that they were mixed. If the red one is longer it would make since that the value is different.
     
  4. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #4 PCosta, Aug 3, 2009
    Thanks for your reply. The red one that I have is 105mm. Is this the correct length?
     
  5. BigTex

    BigTex Seven Time F1 World Champ
    Owner Rossa Subscribed

    Dec 6, 2002
    79,380
    Houston, Texas
    Full Name:
    Bubba
    #5 BigTex, Aug 3, 2009
    Extenders are so inexpensive it's silly IMO to mix them......

    I'd order a set by year specification, and match them all up..wrong or failing ones could indeed be your troubles...

    Newman is right, all my early cars use the black ones.....send them over!

    I haven't ever measured the length, but the main thing to know is the different electrical characteristics, resistance wise.......
     
  6. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #6 PCosta, Aug 3, 2009
    I looked up part number 115647. Rutland and Ricambi shows black. Do I have the right part number for an 84 308QV? Thanks.
     
  7. spiderseeker

    spiderseeker Formula 3

    Jul 22, 2005
    1,718
    Colorado
    Full Name:
    Steve
    #7 spiderseeker, Aug 3, 2009
    **Call them and tell them that you need the red ones.
     
  8. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #8 PCosta, Aug 3, 2009
    Called Rutlands - They only sell the black ones.
     
  9. BigTex

    BigTex Seven Time F1 World Champ
    Owner Rossa Subscribed

    Dec 6, 2002
    79,380
    Houston, Texas
    Full Name:
    Bubba
    #9 BigTex, Aug 3, 2009
    They may all be black...

    They should be able to tell you if you need "resistance" or "non resistance" to match your ignition......
     

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