rev counter stoped. what to do? | FerrariChat
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rev counter stoped. what to do?

Discussion in 'Technical Q&A' started by ricbowling, Sep 28, 2008.

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  1. ricbowling

    ricbowling Karting

    Jan 21, 2008
    140
    Cascais
    Full Name:
    Ricardo Almeida
    #1 ricbowling, Sep 28, 2008
    Last edited: Sep 28, 2008
    My rev counter on 348 spider stopped working. Does anyone have a proceedure to fix this (ie: what should I do first etc)
     
  2. Miltonian

    Miltonian F1 Veteran

    Dec 11, 2002
    5,966
    Milton, Wash.
    Full Name:
    Jeff B.
    #2 Miltonian, Sep 28, 2008
    Is it completely dead, or operating erratically? The signal for the tach comes from the Motronic ECU for the 5/8 bank, based on output from the TDC/rev sensor at the nose of the crankshaft. You could have a bad tach, a bad connection at the instrument cluster, a failure in the ECU, or a problem at the TDC sensor. If there are no other symptoms (hard start, bad idle, missing, etc.) then I would suspect something wrong at the tach itself, either an internal problem or a bad connection. It's certainly not uncommon to find problems at the TDC sensor, but ONLY a problem with the tach reading doesn't seem likely.
     
  3. ricbowling

    ricbowling Karting

    Jan 21, 2008
    140
    Cascais
    Full Name:
    Ricardo Almeida
    #3 ricbowling, Sep 28, 2008
    I just came back from a drive now and for a few minutes the speedometer also stopped working but all of a sudden both the rev counter and the speedometer stated working normally again. I don´t know if this is the beginning of an erratic behaviour (works for 10 minutes then stops working). I hope not... Thanks for your previous advise.
     
  4. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,220
    Mount Isa, Australia
    Full Name:
    Pap
    #4 PAP 348, Sep 28, 2008
    Ahhhh........those pesky gremlins!! :p:p
     
  5. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,047
    USA
    #5 f355spider, Sep 30, 2008
    Ernie has posted before that the first thing to do would be to check, clean and tighten the connections behind the instrument binacle. Also, check, clean and secure all the grounds in there too.
     
    Joe430 likes this.
  6. solofast

    solofast Formula 3

    Oct 8, 2007
    1,773
    Indianapolis
    #6 solofast, Sep 30, 2008
    Floor it and shift by ear!!!!
     

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