Slight Hesitation

  • TearingRaven
    TearingRaven
    Senior Member
    • 2572
    #1

    Slight Hesitation

    This is an issue that has been nipping at me. If I give the throttle a good pump, my engine will hesitate less than a second before revving up. Its very short lived but its certainly there. If I slowly get on the throttle, everything is normal, so it only occurs when I pump it. I checked my codes and got 21 (Coil wtf?) and when I rechecked them, I got a 44 code. Any ideas or suggestions would be greatly appreciated!

    1985 Nissan 300ZX 2+2- My first Z, back in the family
    1987 Nissan 300ZX Turbo RIP 4/87 - 4/28/2011
    Under Construction: 1986 Nissan 300ZX NA2T Slicktop
    Originally posted by Tempestas
    Well, one of the t-tops wasn't latched real well… God only knows where that t-top flew off to at 150+ mph. Didn't scratch the car or anything, just a boom and it was gone. I sure as hell didn't stop to see where it went. I didn't see any stories on the news… so that's a plus.
  • 1SIKZ31
    1SIKZ31
    Senior Member
    • 1236
    #2
    This has been an on-going problem with Z31's from MY EXPERIENCE.

    My Z31 did this, my friends did, and my other friends did.

    I personally came to the conclusion that its because of the stock AFM Placement. I think that because it has to draw air through the charge pipe and through the compressor housing as well as against a ALMOST stalled compressor wheel causes the "delay".

    BUT I also think im IN-correct because my friends VG34 Z31 does not do this, it is INSTANT throttle response without that hesistation you speak of!

    Now when I got my intercooler, this hesitation got even worse!
    I went from 1-2 feet of plumbing before the throttle body to over 5-8 feet (Intercooler piping) of piping!
    My Hesitation got about 50% worse.

    I then upgraded to Z32 AFM and placed it 1 FOOT before the throttle body and the throttle response got 10x better BUT that "hesitation" is still there…

    Heres the kicker.
    The ONLY things my car has to run is:
    Fuel temp sensor.
    MAF (AFM)
    CHTS
    Crank Angle Sensor
    TPS

    THATS IT.

    Sooo… I guess its a programming issue going against the Nissan engineers rather than a Vehicle issue…
    Then again maybe someone more knowledgeable can chime in :baton
    1SIKZ31 -86 SlickTop- R.I.P. 03/01/10 … Parted out :-(
    … New Project: LS1 Miata. Complete. 510whp. 2500lbs.
    1 Month Away from Rear Mount 76 --> 650-700whp.
  • Guest's Avatar
    Guest
    #3
    it seems to be a problem with alot of cars. my Zs do it my jeep does it friends 96 ranger does it etc. etc. etc probably does have to do with the maf.
  • Domdogg123
    Domdogg123
    Senior Member
    • 491
    #4
    Look for vacuum leaks.
    It may not be a Z, but it's still got a turbo…