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355 355 throttle position sensor

Discussion in '348/355' started by Ben111, Feb 6, 2020.

  1. Ben111

    Ben111 Rookie

    Jun 14, 2018
    23
    Full Name:
    Ben
    #1 Ben111, Feb 6, 2020
    Hi when I first got my 355 it would hunt for revs, sometimes up to 2000 -2500 and sometimes down to 800 where it would sound awful, the cars happy at around 1250

    Before I bought the car it had recently had a new aftermarket throttle position sensor so I swapped it with “used” genuine one and the problem was resolved, fast forward a year and 5000 miles the problem is back.

    So I’m assuming the used sensor I installed has gone faulty again.

    I can get a new genuine sensor for around £220 from superformance, or new aftermarket ones are around £25 on eBay, now has anybody else had issues with aftermarket throttle sensors?

    im wondering if I just had a “bad” sensor ( do they need calibrating??) and that a £25 would usually be fine, or do I cough up and pay the Ferrari tax.
     

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  2. johnk...

    johnk... F1 Veteran
    Owner

    Jun 11, 2004
    8,642
    New England/FL
    #2 johnk..., Feb 6, 2020
    BOSCH 0280122004 Same as a 1995-6 Saab 900. DO a Google search. Typically around $100US. But before replacing, clean the contacts and make sure you don't have an idle control valve problem.

    The ECU reads the position when you start the car. Make sure you don't depress the accelerator when starting. No calibration necessary.
     
  3. Ben111

    Ben111 Rookie

    Jun 14, 2018
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    Ben
    #3 Ben111, Feb 6, 2020
    Thanks, seen one on eBay for £150

    so there’s no messing with the settings, just literally connect to the car?,
     
  4. Ben111

    Ben111 Rookie

    Jun 14, 2018
    23
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    Ben
    #4 Ben111, Feb 6, 2020
    Also if I clean the contacts on the ICV, and the problem persists is there another way to determine if the idle control valve is at fault?
     
  5. Kokose7en

    Kokose7en Karting
    Silver Subscribed

    Dec 5, 2019
    135
    SF Bay Area
    #5 Kokose7en, Feb 6, 2020
    Could you post a video of this occurrence? When does it happen? Engine cold, hot? What year is your 355? If you have OBDii, do you have a basic scan tool to check fuel trim values? To check multiplicative for lean mixture compensation, which could point to an air leak in the intake system.
     

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  6. Ben111

    Ben111 Rookie

    Jun 14, 2018
    23
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    Ben
    #6 Ben111, Feb 6, 2020
    Hi

    I can’t take a video at present as I’m away on business.

    It happens hot and cold, my cars a 1996 5.2, I do not have scan tool,
    would this suffice on eBay?
    274172883310
     
  7. Qavion

    Qavion F1 Veteran
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    Feb 20, 2015
    5,139
    Sydney
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    Ian Riddell
    #7 Qavion, Feb 6, 2020
    If you have a UK car, you'll also need a "Fiat 3 pin OBD2 adaptor" and a 12volt supply (you can wire it up to the cigar lighter if you have a cigarette lighter accessory plug). I'm not sure if it shows fuel trims.

    That LAUNCH authorisation certificate in the advertisement has to be fake :rolleyes:
     
  8. Ben111

    Ben111 Rookie

    Jun 14, 2018
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    Ben
    #8 Ben111, Feb 6, 2020
    mines a US import

    is there a specific reader you guys use?
     
  9. Qavion

    Qavion F1 Veteran
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    Feb 20, 2015
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    Ian Riddell
    #9 Qavion, Feb 6, 2020
    Depends on your budget and where you are located (prices and availability vary). I went for a low end reader and I don't think it has fuel trims. Just looking at the manual for that eBay Creader 3001, however, it does have fuel trims.

    Note that as well as generic fault codes, the Motronics ECU produces Ferrari specific codes which you will have to ask us about. Note that on the 355, the reader will only read data from the engine Motronics ECU, not from all the other computers (You'll need a Ferrari-specific tool for that.... crazy expensive). An OBDII reader is a good start, though.
     

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  10. taz355

    taz355 F1 Veteran
    Silver Subscribed Owner

    Feb 18, 2008
    5,427
    Indio Ca/ Alberta
    Full Name:
    Grant
    #10 taz355, Feb 6, 2020
    The one I have was 100 bucks and I think any obd2 has fuel trims. It needs them to adjust for closed loop control.
    I don’t think the tps would do this but not positive. My understanding is it’s only there as a backup
     
  11. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    10,637
    San Carlos, CA
    Full Name:
    Mitchell Le
    #11 yelcab, Feb 6, 2020
    Welcome back Grant !!!
     

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