Slow Down, and Noise | Page 3 | FerrariChat

Slow Down, and Noise

Discussion in '348/355' started by Boaf 32, Aug 2, 2020.

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  1. Boaf 32

    Boaf 32 Formula Junior

    Aug 23, 2016
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    #51 Boaf 32, Sep 15, 2020
    @Qavion, are these ECU's identical?
     
  2. Qavion

    Qavion F1 World Champ
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    #52 Qavion, Sep 15, 2020
    Last edited: Sep 15, 2020
    Yes. I'm starting to wonder if a 1999 model is different. I know there are some variations, but I didn't think there were any on USA 5.2 cars

    I'll try and dig up a picture of the ECUs. Do you have anything bolted to the underside of the secondary air pump?
     
  3. m.stojanovic

    m.stojanovic F1 Rookie
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    #53 m.stojanovic, Sep 15, 2020
    Low oil will not cause SDL.
     
  4. Qavion

    Qavion F1 World Champ
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    #54 Qavion, Sep 15, 2020
    Here's the location on my car below the Secondary Air Pump. One Thermocouple ECU is mounted horizontally, the other vertically (only half shown in the photo).

    Image Unavailable, Please Login

    I didn't check to see which was which. Plugs may have been swapped over the years (including the correct thermocouple leads)
     
  5. Boaf 32

    Boaf 32 Formula Junior

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    #55 Boaf 32, Sep 16, 2020
    Last edited: Sep 16, 2020
    I thank you. I will look this weekend and see if they are identical. If I swap the plugs, it should not damage anything would it? Then if I get a Cat code instead of the 1448, I found the problem. Then, I will pick up an ECU. This is the only code I still have...
     
  6. Qavion

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    #56 Qavion, Sep 16, 2020
    The harnesses should be long enough. Perhaps there are zip ties to remove.
     
  7. m.stojanovic

    m.stojanovic F1 Rookie
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    #57 m.stojanovic, Sep 16, 2020
    Assuming that plugs have been swapped in the past, it may have been only the Thermocouple (TC) plugs, only the harness plugs or both. Since it is not known which plugs, I suggest you first swap only the TC plugs and, if some other code comes up, swap them back. Then, swap only the harness plugs and see what happens. If still trouble, swap both plugs. Before you start this experiment, mark the plugs with one colour on one ECU and with another colour on the other.
     
  8. Boaf 32

    Boaf 32 Formula Junior

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    #58 Boaf 32, Sep 16, 2020
    Perfect, I will do it this weekend and let you know how it goes. Appreciate it.
     
  9. Boaf 32

    Boaf 32 Formula Junior

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    #59 Boaf 32, Oct 6, 2020
    Last edited: Oct 6, 2020
    Well, received the code again. Is the thermocouple different for the bypass valve and the Cat? Diagram does not show a TC.

    At least my new CATS sound good.

    Boaf
     
  10. drbob101

    drbob101 F1 Rookie
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    #60 drbob101, Oct 6, 2020
    It is the same thermocouple for all three locations. B
     
  11. Qavion

    Qavion F1 World Champ
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    #61 Qavion, Oct 6, 2020
    Same code? What did you swap? Plugs or Thermocouple ECUs?
     
  12. Boaf 32

    Boaf 32 Formula Junior

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    #62 Boaf 32, Oct 7, 2020
    Thanks, appreciate it.
     
  13. Boaf 32

    Boaf 32 Formula Junior

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    #63 Boaf 32, Oct 7, 2020
    Replaced the ECU and the code came back. Swapped the TC and the 1448 code did not come back. Going to order a TC. Thanks Qavion.
     
  14. Boaf 32

    Boaf 32 Formula Junior

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    #64 Boaf 32, Oct 23, 2020
    TC Replaced. Cleared code and we will see how it goes after 50+ miles.

    Boaf
     
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  15. Boaf 32

    Boaf 32 Formula Junior

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    #65 Boaf 32, Oct 24, 2020
    GDMF. Yep, CEL came back, will check the code but sure it's the 1448 AGAIN!!!. New ECU, New TC. Just a little ticked the f off.

    The only thing else I can think of is the actual valve that was replaced 4 years ago. That code, in addition to the cat's code came up after it was replaced. I knew the CAT's were crap and had my service place replace the bypass valve. I'm a bit miffed and will let them know. What else can I look at for crying out loud (I really want to curse). ARGHHH.

    Thanks guys.

    Boaf
     
  16. Qavion

    Qavion F1 World Champ
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    #66 Qavion, Oct 24, 2020
    Have you tried swapping the bypass and secondary air solenoid valves?

    It may be possible just to swap the electrical connector and the output pipe (?)
     
  17. Boaf 32

    Boaf 32 Formula Junior

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    #67 Boaf 32, Oct 27, 2020
  18. emac

    emac Formula Junior
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    #68 emac, Oct 27, 2020
    Right rear of the engine. Here is a picture of the two Cat ecu's that you are looking for. One goes to the cat, and the other goes to the bypass. They are sugesting swapping them to see if the codes change.






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  19. Qavion

    Qavion F1 World Champ
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    #69 Qavion, Oct 27, 2020
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    S1 is the secondary air solenoid valve and has a blue electrical connector. S2 is the exhaust bypass solenoid valve.

    Vacuum to both solenoid valves comes from the engine via the tin can "P".
     
  20. Boaf 32

    Boaf 32 Formula Junior

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    #70 Boaf 32, Oct 28, 2020
    I will look for it this weekend. In this picture, it looks like the vacuum line runs from the bypass valve runs to a different location than mine. I will be sure to take photos. Thanks for your help, will let you know. Thanks @Qavion, @emac

    Boaf
     
  21. WATSON

    WATSON Two Time F1 World Champ
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    #71 WATSON, Oct 28, 2020
    I had the 1448 code many years ago.

    Part of the the vacuum line for the bypass valve is a small tube tack welded to the engine frame.
    That tube can crack and not allow the vacuum to get to the bypass valve.
    Running a long rubber tube direct form the bypass to the solenoid valve skips that tube.
    If it works, then that metal tube is bad.

    In addition, you can test the bypass valve by putting the bypass valve vacuum tube into the suction end of a vacuum brake bleeder and pulling the trigger. The valve should open when you apply that vacuum and close once released.

    Lastly, I tee'd in a splice into the long rubber line and ran the hose into the drivers compartment and attached a vacuum gauge to it. I drove around for awhile and you could see the gauge kick in and out as I change revs, gears and speed.
     
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  22. emac

    emac Formula Junior
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    #72 emac, Oct 28, 2020
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  23. Boaf 32

    Boaf 32 Formula Junior

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    #73 Boaf 32, Oct 28, 2020
    Thank you Watson. I may come back to you on the tube welded to the frame.

    I can hear the difference in exhaust note when I step on the gas. I have a vacuum gage with me in FL and will test.

    Boaf
     
  24. Boaf 32

    Boaf 32 Formula Junior

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    #74 Boaf 32, Oct 28, 2020
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