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Thread: Flat spot?

  1. #1
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    Feb 2014
    New Zealand

    Default Flat spot?

    Hello again and after finding a truck load of air leaks and blocked injectors the 280z finally runs. A local garage helped out making sure it's running but it feels like its running flat, it does run but I feel like i need to put my foot to the floor to get any where. Idles fine and I checked plugs and they look perfect. Also seems to really struggle from 4000rpm onward like it's just running out of power. Not to sure where to start. New fuel pump,regulator, injectors cleaned. Any input would help. I feel like I'm close. Thanks

  2. #2
    Registered User siteunseen's Avatar
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    Jul 2011


    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

  3. #3
    No more body roll! SteveJ's Avatar
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    Dec 2003
    Gainesville, GA


    Go through the diagnostics in the fuel injection reference manual: XenonS130 - S130 Reference
    73 240Z
    74 260Z

    Blue's collection of tech tips - A great place to look for answers
    XenonS30 -The cheap source for FSMs
    Georgia Z Club
    Fiddling with Z Cars - Z car tips & tricks and pictures of my car-loving life.
    Steve's CARtography - Just car pictures.

  4. #4
    Registered User 83.FairLadyZX.Bullet's Avatar
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    Aug 2014
    Oak Ridge TN


    sounds like your timing is just a little bit out. like just a hair. not much but enough to screw with it. also maybe check your trans fluid and filter? maybe it needs serviced... or the air flow meter, fuel pressure regulator, cold start injector, etc.... may not be exactly in the fuel rail or lines.... maybe need to clean the tank out... there are many many things it could be. ran into about the same problem on my hubbs' supra, the previous owner had tried to wire up a different ecu, and in doing that, he crossed 2 wires, they were the same color so he thought they were the right places i guess... fixed that, she ran like a charm.
    '83 280zx bone stock so far, a.k.a. Bullet.
    '83 Toyota Supra w/6MGTE swap, a.k.a. Millenium Falcon

    The 2 fastest Japanese cars of '83... do the math.

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