Z32 300ZX TT Flutters when under load

Discussion in 'Technical' started by TK96, Oct 4, 2020.

  1. TK96

    TK96 New Member

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    Just bought a 1989 TT 2+2 manual with 86K on the clock, when its under load it flutters, my mechanic thinks it may be a vacuum leak or possibly something electrical. anyone got any ideas or have something similar happen to them?

    (Not talking about turbo flutters, the engine itself flutters)
     

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  2. ivan129

    ivan129 Member

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    Mmm, flutter > rapid variation in the pitch or amplitude of a signal, especially of recorded sound. Was the stereo on?

    Assume you mean missing under load
     
  3. TK96

    TK96 New Member

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    i wouldnt say missing, more it hesitates under load
     
  4. MintZ32

    MintZ32 Member

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    How much boost you running?

    And how are your coil packs/sparkplugs for health?

    Ignition breakdown can sometimes cause that in my experience...
     
  5. TK96

    TK96 New Member

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    These are great question that i wish i had an answer to for you haha, currently the front of the engine is pulled off ready to do a timing belt, once i put it back together im gonna start chasing it down.

    Doing timing belt, all asseccory belts, oil filter, oil, fuel filter, spark plugs,

    As far as i am aware the coils are fine, but i do have spare coils lying around somewhere in the spare parts i got when i bought it!
     
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  6. rob260

    rob260 Moderator Staff Member

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    Where are you located? It sounds like a misfire. If you’re in Sydney bring it by, shouldn’t be a big deal to diagnose...
     
  7. TK96

    TK96 New Member

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    Live in Broken Hill mate! middle of bloody nowhere haha
    Me and my mechanic gonna have a look at it properly this coming weekend to hopefully figure it out!
     
  8. ivan129

    ivan129 Member

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    While you have the motor down for service, clean, remove oxidation on all the connection pins and mating connectors for your coils and injectors. They are renown for building up corrosion over the years. Also do a comp and if you have a leak down test. Nice to know the health of the bores and valve seats. Make sure the timing belt is back on though before cranking the engine. I can't remember whether these things are interference or not however always a good idea to only crank an engine with the timing belt on and in the right spot. If you are going to use the old plugs, clean and gap. Happy Zeding
     
  9. MickW

    MickW Carntry member...

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    Definitely interference, as in the valves can hit the pistons if the mechanical timing is out.
     
  10. MickW

    MickW Carntry member...

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    As in, it hesitates only when you first push the throttle or it struggles for a while? Is that at all revs or just around certain revs?
     
  11. TK96

    TK96 New Member

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    Fine at idle, struggles under throttle

    starts up and idles perfectly fine but just struggling when on the throttle, about to do timing belt, thermostat, water pump, spark plugs, oil, oil filter and fuel filter next weekend, just waiting on the parts to come, put it all back together and see if its still doing it, if it is ill start chasing down possible causes.
     
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  12. MickW

    MickW Carntry member...

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    Does it start to fail above 2,500 RPM?

    That's a nice grocery list you have there mate but what stands out to me is the fuel filter.
    It's a possible culprit for your lack of power under load but I'd expect misfiring and rough running.
    Same with the spark plugs - you'd be running rough if they are crook.
    Change the fuel filter and plugs before you do anything else then go for a drive.
    The other parts need replacing for long term reliability but unless your timing belt has slipped a few teeth replacing those other bits won't sort your issue.
     
  13. Harleynissan

    Harleynissan AussieSpeedingFines

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    I'd go for spark plugs or a coilpack or two.
    Has the P.T.U been replaced?
     
  14. TK96

    TK96 New Member

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    Late reply but the problem has been fixed, timing was out a few teeth on a couple of the cams and caused its bad running, now runs much better and is no longer backfiring, running rough or smelling rich.

    New plugs, new fuel filter, oil change and oil filter, cleaned air filter, new timing belt, new drive belts and it runs way better.

    But now i have other issues to sort out haha
     
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