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Sunday Full of Codes

Discussion in '348/355' started by GiulioP, Aug 23, 2020.

  1. GiulioP

    GiulioP Karting

    Jun 12, 2019
    81
    Full Name:
    Giulio Palazzo
    Got a whole bucket load of them today.
    Bank 5-8
    1212
    1121

    Bank 1-4
    4122
    1212
    1211

    Not sure what to even ask. lmao
    Also, can anyone tell me how to post a part for sale in the market place?

    Thanks!
     
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  3. Qavion

    Qavion F1 Rookie
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    #2 Qavion, Aug 23, 2020
    Last edited: Aug 23, 2020
    1995 348 2.7 Spider? (please fill in your profile page with car details so we don't need to keep asking you what car you have ;) )

    5~8

    1212 long and short term Lambda regulation
    1121 rpm sensor

    1~4
    4122 Cat temp ECU
    1212 long and short term Lambda regulation
    1211 Lambda regulation

    I don't see a common power or earth issue causing all these problems. The rpm sensor problem is probably the left bank crank sensor or wiring. Cat temperature may be a thermocouple or thermocouple ECU, but may be related to your fuel regulation problems.

    A history of what you have already done would be helpful:

    e.g. https://www.ferrarichat.com/forum/posts/147168992/
     
  4. Qavion

    Qavion F1 Rookie
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  5. emac

    emac Formula Junior
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  6. Ferrarium

    Ferrarium F1 Rookie
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    Ian is right on.

    1121
    rpm sensor, replace them both

    4122
    -Check cat ECU for cracks.
    -Worn out cat.
    -Bad thermocouple.
    -It is possible something is running rich or lean which may be related to the other lambda codes below.

    4122 in order of what I would do:
    -O2 sensor
    -FPR
    -Clean injectors (do it anyhow)
    -MAF out of spec (rebuild them that's my guess btw)
    -Fuel pumps


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  8. GiulioP

    GiulioP Karting

    Jun 12, 2019
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    Giulio Palazzo
    Swapped the maf from aide to side as well as the o2 senaors That's it so far.
     
  9. GiulioP

    GiulioP Karting

    Jun 12, 2019
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    Giulio Palazzo
    Qavion likes this.
  10. GiulioP

    GiulioP Karting

    Jun 12, 2019
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    Giulio Palazzo
    Thanks for all the help folks!
     
  11. GiulioP

    GiulioP Karting

    Jun 12, 2019
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  13. Ferrarium

    Ferrarium F1 Rookie
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    No OBD2 that I know of unless 95 is different than other 348's.
    Aftermarket exhaust makes no difference on the 348 with those codes, its the 355 that gets finicky there..

    All the effort swapping parts side to side. Just replace them. They are likely 25 years old anyhow and have hit high tie long ago.

    Please be clear what car you have?
     
  14. GiulioP

    GiulioP Karting

    Jun 12, 2019
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    Giulio Palazzo
    1
    1995
    1995 348 Spider U.S. Spec 2.7 Motronic
     
  15. yelcab

    yelcab F1 World Champ
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    and what is it doing now? Did. you clear the codes after the swap?
     
  16. johnk...

    johnk... F1 Veteran
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    #13 johnk..., Aug 24, 2020
    Last edited: Aug 24, 2020
    Replace O2 sensors andgo from there. $150 for a pair at Rock Auto. If the RPM sensor was bad the car would only run correctly on one bank. The other would be dead of have a serious misfire or intermittent break up..

    By the way, was the car running when you read the codes? If not, you will get an RPM sensor code for both banks. If it wasn't running you may have missed it on the other bank. If it was running and you got the RPM code, you should have noticed it running poorly.
     
  17. GiulioP

    GiulioP Karting

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    I actually read the codes with both the car on and off. When the lights came, it was running poorly. Bad idle and sluggish.
     
  18. GiulioP

    GiulioP Karting

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    I actually read the codes, cleared, went back in the house. Needed to take a breath and haven't really let it run or drive it. Don't want to end up on the side of the road.
     
  19. GiulioP

    GiulioP Karting

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    Giulio Palazzo
    I see there's a bosch and ngk o2. What's everyone using?
     
  20. johnk...

    johnk... F1 Veteran
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    #17 johnk..., Aug 24, 2020
    Last edited: Aug 24, 2020
    Thanks for the clarification. That does point to a possible problem with the signal from the RPM sensor. Check the wiring from the sensor. Check the resistance of the sensor it should be around 1k ohm +/- a couple of hundred.
     
  21. johnk...

    johnk... F1 Veteran
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    #18 johnk..., Aug 24, 2020
    Last edited: Aug 24, 2020
    Bosch is OEM.

    Just want to add that it does seem odd that you would get the O2 codes on both banks at the same time. That may point to something else. Not sure which bank controls the fuel pump, but I believe the fuel pump won't turn on unless the engine is cranking (i.e. it sees a signal from the RPM sensor).
     
  22. Qavion

    Qavion F1 Rookie
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    Wouldn't each ECU control their respective fuel pumps?

    Having both banks generating codes was baffling me, too. When I asked about the exhaust, I was thinking something wasn't plugged in (electrically) or wasn't fitted properly causing air leaks.
     
  23. johnk...

    johnk... F1 Veteran
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    You are probably correct on dual fuel pump cars. I was thinking of my 355. Switched to single fuel pump some time in 95.
     
  24. Ferrarium

    Ferrarium F1 Rookie
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    Reading codes with the car off will always throw rpm sensor error. If you don't get it with the car on that's no an issue.
    Fuel pumps only run when engine is cranking, when turning key to energize before run it supplies zero power to the pumps.
     
  25. GiulioP

    GiulioP Karting

    Jun 12, 2019
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    Giulio Palazzo
    I was driving when both lights came on. It became sluggish, stalled, then while isling it was poor.
     
  26. GiulioP

    GiulioP Karting

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    As much as I appreciate this info. Might be a bit over my head om this. Lol
     
  27. johnk...

    johnk... F1 Veteran
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    In that case I might not be so quick to replace the O2 sensors. The O2 sensors would not result in that behavior. Need to do a proper diagnosis.
     
  28. yelcab

    yelcab F1 World Champ
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    Some 95 355 has only 1 fuel pump.
     

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