Miss cyl 6 and cel - injector diode | FerrariChat
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Miss cyl 6 and cel - injector diode

Discussion in 'Technical Q&A' started by ForTax, Nov 23, 2015.

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  1. ForTax

    ForTax Karting

    Nov 9, 2015
    131
    Queensland Australia
    Full Name:
    Roger Garcia
    #1 ForTax, Nov 23, 2015
    Hi guys, just had my 360 spider 2004 fixed last week, it had a misfire and they found that injector 6 was getting the wrong signal but if they put a noide light on it while running it worked fine, they ended up putting a diode on injector 6 and all fixed, no miss no cel.. Just wondering if anyone know the actual cause or how to repair it without the diode? They did try to change the left and right hand computer and it was the same, is there a diode pack somewhere for the injectors ? Any help would be great ( the car is fine but I would like to know the real problem)

    Thanks
     
  2. ///Mike

    ///Mike F1 Veteran

    Dec 11, 2003
    6,097
    Bugtussle
    #2 ///Mike, Nov 23, 2015
    Did they try replacing the injector, or at least swapping it with another? Seems like the first place to start...
     
  3. mello

    mello F1 Veteran
    Silver Subscribed

    Jul 12, 2013
    5,518
    CA Bay Area
    Full Name:
    Steve
    #3 mello, Nov 29, 2015
    Last edited: Nov 29, 2015
    Interesting... An injector is just a solenoid coil. In a typical electronic circuit, a diode is connected in reverse bias across a solenoid coil when powered by DC voltage. The purpose of the diode is to protect other electronic components in the circuitry from inductive (or kick-back) voltage that occurs when DC voltage to the coil is de-energized. I would think that there are protection circuitry already built into the ECUs.

    In my opinion, using a noid light will only tell you that there is sufficient voltage present on the injector connector and and that the wiring is OK. But it doesn't tell you if there is sufficient current available to drive the injector to its operating specification.

    I suspect that the ECU is defective, but you stated that the mechanic has already swapped ECUs to eliminate that possibility. Puzzling to say the least.
     
  4. ForTax

    ForTax Karting

    Nov 9, 2015
    131
    Queensland Australia
    Full Name:
    Roger Garcia
    #4 ForTax, Dec 1, 2015
    Thanks for the response guys, it's not an easy one ...
     
  5. ForTax

    ForTax Karting

    Nov 9, 2015
    131
    Queensland Australia
    Full Name:
    Roger Garcia
    #5 ForTax, Jul 16, 2016
    it ended up being the inlet manifold gasket :) all fixed
     
  6. rugby

    rugby Formula Junior

    Apr 10, 2015
    364
    Atlanta
    #6 rugby, Jul 17, 2016
    In that case, I don't see how adding the diode fixed this originally. Was the diode installed reverse biased as a parallel flyback didode, or was it added in series? Not that it matters at this point, just curious.
     

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