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F355 RMP Problem

Discussion in '348/355' started by fck, Dec 27, 2011.

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  1. fck

    fck Rookie

    Jan 21, 2010
    31
    HK
    #1 fck, Dec 27, 2011
    Hi All, my 1997 manual F355 5.2 these day have the problem when I start the car and accelerate to 3,000 rmp the techometer cannot climbing and back to zero like switch off the engine, when I slow down seem below 3,000 rmp the techometer will work again and back to actual rmp, if accelerate and meet 3,000 rmp the problem will appear again just want to know that any guy got this matter before?
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,567
    San Carlos, CA
    Full Name:
    Mitchell Le
    #2 yelcab, Dec 27, 2011
    I would guess that it is the Speed sensor attached to the transmission. If replacing that does not work, then the speedometer needs to be looked at next.
     
  3. 2NA

    2NA F1 World Champ
    Consultant Owner Professional Ferrari Technician

    Dec 29, 2006
    18,221
    Twin Cities
    Full Name:
    Tim Keseluk
    #3 2NA, Dec 27, 2011
    Speedometer? I think the problem is in the tachometer.
     
  4. Monteman

    Monteman Formula 3
    Rossa Subscribed

    Feb 9, 2006
    2,345
    Santa Barbara, CA
    Full Name:
    Monte
    #4 Monteman, Dec 27, 2011
    Similar sensor to the speed sensor but it is on the engine. I would check to see if it's dirty first and if not then potentially replace it.
     
  5. fck

    fck Rookie

    Jan 21, 2010
    31
    HK
    #5 fck, Dec 27, 2011
    But the speedometer is working well only the techometer have problem.....
     
  6. fck

    fck Rookie

    Jan 21, 2010
    31
    HK
    #6 fck, Dec 29, 2011
    Today I have drive my car again and saw one very mistery scenic, when the engine get warm the tachometer will back to normail ( can climbing over 3,000 rmp ) seem the problem just happen when cool engine situation.
     
  7. pourquoi_ne

    pourquoi_ne Karting

    Mar 16, 2006
    224
    England
    Full Name:
    John
    #7 pourquoi_ne, Dec 29, 2011
    RPM!
     
  8. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,567
    San Carlos, CA
    Full Name:
    Mitchell Le
    #8 yelcab, Dec 29, 2011
    Sorry, I was thinking about my own problem which was the speed sensor in the transmission. Of course, you are having problem with the RPM sensor which is on the engine side.
     
  9. fck

    fck Rookie

    Jan 21, 2010
    31
    HK
    #9 fck, Dec 29, 2011
    RPM sensor is it equal to speed sensor ?
     
  10. gus355

    gus355 Formula Junior

    Aug 3, 2011
    569
    B.C. and WA
    #10 gus355, Dec 29, 2011
    "mistery scenic"?
     
  11. fck

    fck Rookie

    Jan 21, 2010
    31
    HK
    #11 fck, Dec 30, 2011
    The problem have fixed after I unplug the phase sensor and used the cotton pad to clean the sensor surface.
     
  12. m5guy

    m5guy Formula 3

    Aug 17, 2008
    1,627
    Ventura, CA.
    Full Name:
    Greg
    #12 m5guy, Dec 30, 2011
    Nice job - a $0.00 repair! (And score one for Monteman who nailed the fix in his post #4.)
     

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