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  1. #1
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    Engine Hot in dash, water and oil temps are ok.

    Hi guys,
    Strange problem with a friend's 335i. After a long pull, 2-3-4 at redline, yellow engine hot in dash comes up. What is strange is the fact that water temp and oil temp shows normal temps 220-230 F. It does this even on stock map (Map 0 JB4 G5 ISO).
    Read the codes and NO code present!!
    What the hell could it be? Click here to enlarge Very annoying situation, we cannot tune the car because of this.

    P.S. the car is RB FBO + meth with JB4 G5 ISO.

    Thanks for any help!
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  2. #2
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    How are you measuring the water temperature?
    Eppur si muove.

  3. #3
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    With JB4 Menu 7-6.Click here to enlarge Or menu 2-6.
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  4. #4
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    Click here to enlarge Originally Posted by piele_bps Click here to enlarge
    With JB4 Menu 7-6.Click here to enlarge Or menu 2-6.
    Ok, just wanted to verify you were using the stock temp sensor for the reading. I have no idea what could be the problem, sorry.
    Eppur si muove.

  5. #5
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    Have you checked the coolant level?

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    220 seems fairly hot for water temp under high load... typically should be around 200 or less I think. Idle and light load, 220 to 230. but I haven't reviewed water temps very thoroughly.

  7. #7
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    210-220 is fairly normal
    Click here to enlarge

  8. #8
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    Coolant level checked, it is ok.
    E90 335i 6MT
    JB4 G5
    FBO + Meth

  9. #9
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    Something you could try is reducing the glycol concentration to something like 30% to 70% of distilled water and adding 8 ounces of engine coolant surfactant additive like Redline Water Wetter or Motul MoCool. This should improve the coolant's ability to carry heat significantly.

    For reference the car targets four different temperatures depending on load:

    90C (Highest Load)
    95C
    104C (Normal)
    108C ("ECO" Mode)

    These are target values so your coolant isn't necessarily going to be this temperature.

    Also the engine's coolant over-temperature protection starts at 117C.

    Finally, what was the ambient temperature when you were experiencing this problem?
    Eppur si muove.

  10. #10
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    Ambient was 17 Celsius.
    Thanks for info!
    E90 335i 6MT
    JB4 G5
    FBO + Meth

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