wildly bouncing 355 speedometer ??? | FerrariChat
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wildly bouncing 355 speedometer ???

Discussion in '348/355' started by hjp, Nov 11, 2014.

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  1. hjp

    hjp Formula Junior

    Feb 23, 2013
    591
    Kansas City, Mo.
    Full Name:
    Jerry Peterson
    #1 hjp, Nov 11, 2014
    I have a '96 355 Spider with a manual 6 speed. My speedometer has just started to wildly bounce around at speeds below about 40 mph. It doesn't go to zero at a stop either. It stays stuck at about 10 mph. From 40 to 45 mph and up, its dead steady like it should be. What's gong wrong? My understanding is its electronic. Is there a sending unit going bad? Where is located?
     
  2. greyboxer

    greyboxer F1 World Champ

    Dec 8, 2004
    12,702
    South East
    Full Name:
    Jimmie
    #2 greyboxer, Nov 11, 2014
    If its like any other Ferrari speedo it never did go to zero because there is a pin stopping it.....

    Intermittent could be sender but could also be dodgy connection at sender (not sure of exact location on 355 but a quick search should reveal previous similar threads - maybe gearbox)
     
  3. JOW02

    JOW02 Karting

    Apr 3, 2008
    92
    Brisbane
    #3 JOW02, Nov 11, 2014
    My F355 did this. It would fluctuate up and down going up to 180km/h while sitting at the traffic lights. It was the sender unit which is located down the side of the gearbox. Check the connectors first but once I replaced sender unit there were no more problems.
     
  4. hjp

    hjp Formula Junior

    Feb 23, 2013
    591
    Kansas City, Mo.
    Full Name:
    Jerry Peterson
    #4 hjp, Nov 12, 2014
    I've looked at the parts diagrams and can't find the sending unit. I am told its on the side of the gearbox. Which side and exactly where? What parts diagram shows this? Its not with the speedometer and I can't find anything looking at the transaxle diagrams. Doing a search under speedometer sending unit brings up nothing. ????????????????
     
  5. WATSON

    WATSON Two Time F1 World Champ
    Owner Rossa Subscribed

    Sep 9, 2010
    23,883
    WI
    #5 WATSON, Nov 12, 2014
  6. hjp

    hjp Formula Junior

    Feb 23, 2013
    591
    Kansas City, Mo.
    Full Name:
    Jerry Peterson
    #6 hjp, Nov 13, 2014
    Thanks Watson. I looked at that table but a "pulse sensor" just didn't register. I'll double check the connection first to be sure that's not the problem before buying a new one.
     

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