Z32 MAF in Z31 Nistune issue

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  • #1

    Z32 MAF in Z31 Nistune issue

    I have a customer that brought me an 87 300zx with many modifications, one being a Z32 MAF. I verified that he has it wired correctly and I am getting the proper voltage at pin 31 at the ECU which is the MAF signal pin. The car will start and idle but revs poorly. I am getting between .5 and 2 volts on the MAF pin at the ECU just revving it freely so I know that the MAF is working correctly. The problem is that the Nistune software states that I have a MAF DTC and the voltage for the MAF in the Nistune software stays at .8 volts all of the time. The customer thought that he might have read in the past that the Nistune requires the MAF to be wired to a different pin?? I could not find anything one this. Anyone have any ideas??



    Thanks,

    Larry
    Sound Performance
  • #2
    Did you select the z32 maf instead of z31 in nistune?
    http://z31performance.com/showthread…2-2-(-now-NA2T
    My build thread (:
  • #3
    http://www.redz31.net/pages/fuel/afmcrap.html
  • #4
    Reference the NisTune documents here to verify proper setup: http://www.nistune.com/support-docum…on-general.php
  • #5
    Was the ecu re-wired for the Z32 MAF?
  • #6
    Originally posted by les_joey_paul
    Did you select the z32 maf instead of z31 in nistune?

    Yes
  • #7
    Originally posted by Trbulnt View Post
    Was the ecu re-wired for the Z32 MAF?

    I will ask the customer, I am not sure.
  • #8
    Originally posted by 88sinZ
    Reference the NisTune documents here to verify proper setup: http://www.nistune.com/support-docum…on-general.php

    It is wired correctly. Verified MAF output at both the MAF and at the ECU.
  • #9
    I'd also make sure the firing order is correct. I know it's easy to switch 2 of the spark plug wires. Is the maf being used as a draw through or blow through setup?
  • #10
    The car runs and idles smoothly so the firing order has to be correct. The MAF is blow through. I am going to try to convince the customer to go standalone.
  • #11
    Originally posted by Trbulnt
    Was the ecu re-wired for the Z32 MAF?

    Originally posted by Sound Performance View Post
    I will ask the customer, I am not sure.
    Before any further consideration - this is the most important aspect
  • #12
    Originally posted by 88sinZ View Post
    Before any further consideration - this is the most important aspect

    I have been trying to get in contact with the owner of the vehicle about this.

    You are saying that there is a physical change made to the ecu when using a Z32 MAF? It would have to be an input change to which pin is used I would imagine??
  • #13
    Originally posted by akurtzer57 View Post
    http://www.redz31.net/pages/fuel/afmcrap.html
    The answer you seek is in here.
    http://z31performance.com/showthread…2-2-(-now-NA2T
    My build thread (:
  • #14
    Originally posted by Sound Performance
    I have been trying to get in contact with the owner of the vehicle about this.

    You are saying that there is a physical change made to the ecu when using a Z32 MAF? It would have to be an input change to which pin is used I would imagine??
    Yes 3 resistors need to be removed.
  • #15
    *** do the ecu mod for the voltage adjustment for the MAF PER NISTUNE'S instructions, as the earlier Ecu's require desoldering a connection bridge or two, the later ECU's require resistor clipping etc. (depending on if they used the stock ecu or not) taking the stock Z31 MAF (which are wired identical to the Z32's) voltage from 2-7 down to the Z32's require 0-5V reference.
    Damn dirty angels....these cars!

    Current Daily Driver - 86 Turbo.
    Under the cover - THE BANANA… that needs to be re-energized.
    sigpic
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