DIY: 360 Fix your MAF for less than $1.00 | FerrariChat

DIY: 360 Fix your MAF for less than $1.00

Discussion in '360/430' started by mello, May 18, 2014.

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  1. mello

    mello F1 Veteran
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    #1 mello, May 18, 2014
    Last edited by a moderator: Sep 7, 2017
    I've been having some driveability issues and narrowed it down to a skewed IAT sensor on the MAF module. Instead of replacing it with a brand new MAF at a cost of $500-$800 dollars, I decided to just replace the IAT sensor. I found a Honeywell part number that is an exact replacement. The best part of this fix is the price... less than $1.00 USD! I decided to replace both side and ordered two from NEWARK.COM. The SKU number is 10M5322. Oh, and it is free shipping. Enjoy!
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  2. Fatty

    Fatty Karting

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    #2 Fatty, May 18, 2014
    :O
    Thanks for the info!!!
     
  3. mello

    mello F1 Veteran
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    #3 mello, May 18, 2014
    :D ... the cheapest fix on a Ferrari EVER!
     
  4. f360nh

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    #4 f360nh, May 18, 2014
    Newark has free shipping? That I don't believe! ;-)
     
  5. mello

    mello F1 Veteran
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    #5 mello, May 18, 2014
    ... and it came via FedEX within three days! They gotta be losing money on this one. :D
     
  6. docf

    docf Formula 3

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    #6 docf, May 18, 2014
    Unbelievable! Thanks for the info!
     
  7. GWARREND

    GWARREND Formula Junior

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    #7 GWARREND, May 18, 2014
    Great post...thank you. This is the same MAF that was used in the E46 M3 and it was fixed regularly with electrical cleaner :) before having to replace sensor or unit.
     
  8. vrsurgeon

    vrsurgeon F1 World Champ
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    #8 vrsurgeon, May 18, 2014
    VERY NICELY DONE!
     
  9. mello

    mello F1 Veteran
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    #9 mello, May 18, 2014
    Thanks. I hope some folks here can use this info. Spread the luv mon! :)
     
  10. casey330

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    #10 casey330, May 18, 2014
    Awesome !!
     
  11. 993turbo

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    #11 993turbo, May 19, 2014
    What were the driveability symptoms, and did the this DIY fix it completely?

    :D
     
  12. ApeGen

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    #12 ApeGen, May 19, 2014
    That's brilliant, Mello! Cheers
     
  13. English Rebel

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    #13 English Rebel, May 19, 2014
    Price in Honeywell box = $0.87
    Price in Ferrari box = $325 includes $324.13 Ferrari tax.
    Ahh gotta love Ferrari. I used to work for Austin-Morris and they always said that the only division making money was the spares division. Cost of a new Mini back then $500. Cost of building a Mini from spares $850,000.
    Alan
     
  14. voicey

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    #14 voicey, May 19, 2014
    Last edited by a moderator: Sep 7, 2017
    Before anyone starts to think this is a silver bullet it should be noted that only the Auxiliary temp sensor has been reaplaced - there are a few other things that could go wrong inside the MAF.

    It is a clever fix though and if you're having MAF problems it would be worth trying this.
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  15. vrsurgeon

    vrsurgeon F1 World Champ
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    #15 vrsurgeon, May 19, 2014
    I think its excellent. Could be an issue on the PCB board.. but I think its a great, cheap first diagnostic step. I just ordered 4 just to have on hand..
     
  16. star4747

    star4747 Formula Junior

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    #16 star4747, May 19, 2014
    This is why Ferrari owners get a bad name. “They are SO RICH....” they can just have spare sensors for Mass Air Flow units sitting in their garage.
     
  17. English Rebel

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    #17 English Rebel, May 19, 2014
    I am not of the "lets keep replacing stuff until the problem goes away" kind of guy -- but for less than $2 this has to be an exception. I'm ordering two lest Newark catch on and have a Ferrari price.
    Alan

    Are there two per MAF as in the first photo I see the thermistor sort of clipped in yet on the other two photos is shows some sort of soldering. Please clarify.
    Thanks
     
  18. whatheheck

    whatheheck F1 Rookie
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    #18 whatheheck, May 19, 2014
    Excellent find indeed! Thanks for sharing info.

    It is indeed usually the Thermistor / Temp Sensor that goes bad on MAF's as heat is applied to them / they are heated.

    MAF's cost a lot because of the housing and the PCB. Thermistors are cheap.
    Now we know the part number!

    Thanks again!

    Dan
     
  19. mello

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    #19 mello, May 19, 2014
    It runs fine during initial start up in open loop. But once in closed loop and after the engine is fully warmed up, I get sporadic RPM flunctuations (+/- 100 rpm). Slowly it graduated to engine hesitations after a stop or light pedal pressure. And this seems to varie depending on the time of the day. I plugged in the scanner and it was obvious to me that the IAT readings differs between the banks and the ambient temperature when the engine is stone cold. I swapped the MAF between the banks and the erroneous reading follows the bad MAF. I scoped both of the MAF signal output and they are fine.

    I then replaced the IAT and confirmed that both banks are reading consistently and in line with the ambient temperature. Now I don't get the hesitation on light pedal pressure and the throttle response is crisper. But I'm still getting the RPM fluctuation. My next step is to check the COPs for misfiring.
     
  20. mello

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    #20 mello, May 19, 2014
    Only one thermistor is used per MAF. I cut the defective thermistor out and tack-solder the new one in its place. The thermistor is not polarized. I snipped the lead short of the crimp connector because it looks like it was micro-welded in place and I didn't want to take the chance of destroying it.
     
  21. whatheheck

    whatheheck F1 Rookie
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    #21 whatheheck, May 19, 2014
    Bad MAFs as mentioned are usually hunting idle, reduced power and acceleration hesitation.
     
  22. mello

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    #22 mello, May 20, 2014
    Last edited by a moderator: Sep 7, 2017
    The cause of the RPM fluctuation was a loose hose at bank 1 of the intake plenum. I took a trip to a local Ace hardware store and bought a bunch of spring hose clamps of various sizes. That fixed it!
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  23. whatheheck

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    #23 whatheheck, May 20, 2014
    Thanks for the update!

    Dan
     
  24. mello

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    #24 mello, May 20, 2014
    Welcome back! :)
     
  25. whatheheck

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    #25 whatheheck, May 20, 2014
    Thanks Steve!

    Will post photos of my visit to Ferrari Museum soon.

    Dan

     
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