KE-Jetronic potentiometer trouble | FerrariChat
Buy

KE-Jetronic potentiometer trouble

Discussion in 'Technical Q&A' started by Jay535, Apr 1, 2022.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. Jay535

    Jay535 Karting

    Mar 10, 2011
    148
    Toronto Area, Canada
    Full Name:
    Jay Lebo
    #1 Jay535, Apr 1, 2022
    KE Jetronic as fitted to my 1988 Euro-spec Testarossa has a throttle position potentiometer. Inside the fuel distributor there are two delicate multi-wire wipers that slide along the potentiometer. One of my multi-wire wipers is broken.

    I’m including a photo from a fuel distributor taken off a Mercedes, with the part in question circled. Mine’s broken off.

    Any suggestions? My tech and I are having a very difficult time working out a fix.

    Image Unavailable, Please Login
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,640
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Apr 1, 2022
    Last edited: Apr 1, 2022
    I think this thread is the only time that we had a detailed discussion about the potentiometer on the TR airflow metering flap (but never heard back from the OP about doing the functional voltage test on the possible MB replacement):

    https://www.ferrarichat.com/forum/threads/ke-jetronic-air-flow-meter-potentiometers.644465/#post-148001786

    Is your potentiometer also Bosch 3437224031? Although the part you are looking for is part of the airflow metering unit. Maybe a dismatler or an MB airflow metering unit might use the same wiper (even if the MB potentiometer is different) -- just a thought...
     
    Jay535 likes this.
  3. Jay535

    Jay535 Karting

    Mar 10, 2011
    148
    Toronto Area, Canada
    Full Name:
    Jay Lebo
    #3 Jay535, Apr 5, 2022
    It's starting to look like I'm gonna have to buy the whole thing, or find a CIS wizard who can repair it.

    I can't find any evidence that anyone has ever had this problem before. I'm sure it's happened to others, but I can't find a single post on the subject of a broken wiper arm anywhere.
     
  4. tbakowsky

    tbakowsky F1 World Champ
    Consultant Professional Ferrari Technician

    Sep 18, 2002
    19,876
    The Cold North
    Full Name:
    Tom
    #4 tbakowsky, Apr 5, 2022
    Try Larry at CISflowtech.com he may have or know where to get one. I honestly can't see why it would not be the same as a Benz sensor from an inline six..like the 190e 2.6 or the 300e
     
    Jay535 likes this.
  5. 85MondialQV

    85MondialQV Karting

    Feb 20, 2021
    98
    Full Name:
    Matt Drake
    #5 85MondialQV, Apr 20, 2022
    I’m selling my whole CIS system off my Mondial FYI. I’m installing EFI instead.


    Sent from my iPhone using FerrariChat
     
  6. tbakowsky

    tbakowsky F1 World Champ
    Consultant Professional Ferrari Technician

    Sep 18, 2002
    19,876
    The Cold North
    Full Name:
    Tom
    #6 tbakowsky, Apr 20, 2022
    Not a bad idea really. CIS injection parts are becoming quite rare. Bosch no longer services the system except for a few minor parts. CIS flow tech is about the only place around that has the ability and knowledge to actually rebuild the fuel heads and warm-up regulators etc.

    Switching it put to a more modern system would really help with not only a power increase but ease of maintenance.
     
  7. 85MondialQV

    85MondialQV Karting

    Feb 20, 2021
    98
    Full Name:
    Matt Drake
    #7 85MondialQV, Apr 20, 2022
    Larry Fletcher as you mentioned is the man!! Spoke with him a few times on these CIS issues I’ve had. But if anyone wants my old system for parts it’s for sale.


    Sent from my iPhone using FerrariChat
     
  8. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,640
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #8 Steve Magnusson, Apr 21, 2022
    You're hijacking/off-topic the OP's thread a bit -- your K-Jet airflow metering device does not have an airflow plate potentiometer like a KE-Jet airflow metering device.
     
  9. 85MondialQV

    85MondialQV Karting

    Feb 20, 2021
    98
    Full Name:
    Matt Drake
    #9 85MondialQV, Apr 21, 2022
    Wasn’t trying to hijack. Thought maybe I had the part he needed. Sorry about that


    Sent from my iPhone using FerrariChat
     
  10. Jay535

    Jay535 Karting

    Mar 10, 2011
    148
    Toronto Area, Canada
    Full Name:
    Jay Lebo
    #10 Jay535, Apr 22, 2022
    Good effort. I appreciate the attempt to help me.

    For now I’d like to keep the car original. If I end up owning it a very long time I’ll probably convert to EFI at some point. But for now I anticipate I will own it only a few years, and a modded engine would complicate that I think.

    My Jaguar XJS V12, on the other hand, I would love to convert to EFI. That car’s worth much, much less than the Testa, and I’d love to have it running like a modern. One day, for sure…
     
  11. Andy 355

    Andy 355 Formula Junior

    Jun 2, 2013
    434
    Sydney
    #11 Andy 355, May 2, 2022
    The Xjs should already be EFI... The Xjs is a great car, however it's quite the complex machine.
     
  12. Jay535

    Jay535 Karting

    Mar 10, 2011
    148
    Toronto Area, Canada
    Full Name:
    Jay Lebo
    #12 Jay535, May 2, 2022
    You're right. Let me correct myself. I would like to convert my XJ-S to modern EFI, like this:

    https://mobeck.com/jaguar-v12-efi-kit/
     
  13. Andy 355

    Andy 355 Formula Junior

    Jun 2, 2013
    434
    Sydney
    #13 Andy 355, May 4, 2022
    That is a very nice kit indeed. The engine is a gem and with modern EFI it would be fantastic. 6 to 7k rpm v12s can only be matched by Ferrari.
     
  14. Jay535

    Jay535 Karting

    Mar 10, 2011
    148
    Toronto Area, Canada
    Full Name:
    Jay Lebo
    #14 Jay535, May 4, 2022
    Thanks for the encouragement, brother!
     
  15. Jay535

    Jay535 Karting

    Mar 10, 2011
    148
    Toronto Area, Canada
    Full Name:
    Jay Lebo
    #15 Jay535, May 20, 2022
    Yup, looks like I do need a new fuel distributor base after all, part number 123411.

    Anybody got one in better shape than this?

    https://www.ebay.com/p/1852154045
     
    85MondialQV likes this.
  16. 85MondialQV

    85MondialQV Karting

    Feb 20, 2021
    98
    Full Name:
    Matt Drake
    #16 85MondialQV, May 20, 2022
    I got one. DM me.


    Sent from my iPhone using FerrariChat
     

Share This Page