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  • Engine problems?!

    I have a small problem in my car..

    Everything works fine before i did run TopSpeed run in airport.
    1800m (1.11846815 miles) with 202kmh (125.516981 mph) topspeed. Pedal to the metal whole run.
    Few month after this i have change sparkslugs to one step colder and big K&N filter. Stock in other ways..

    Dynosheet. I'm missing 10HP and i have 20Nm torque than stock. rear muffler was damaged (no internal parts.. 107db sound :shock: ). Timing was off 3-5 degree.. (Stock 228HP/5400RPM, 326Nm/3600RPM)

    After that every once an while i get small problem. Might be one a day / week / month. Maybe few times in summer..
    No matter if i'm running in city for low cruise or higher speed on freeway.

    Car starts to put Black smoke like diesel engine on dragrace ( :lol: ). If i touch gas pedal it smokes more and rpm's don't go much up.
    No boost.. no matter how i try i can't get boost.
    One time friend of mine say it sounds like i'm runnig in 5 cyl. not 6.
    (Sparkplugs were changed after first time this happened)

    If i just cruise gently problem goes away ion few min. and if i stop on busstop + few min. waiting everything works well after that.

    Few times problem have gone away with pumping gas pedal and force to boosting

    I have had this problem hence summer 2004 when i did that topspeed run. I drive my car maybe 3000km/year (1 864.11358 miles) in 4-5month @ Summer.
    Rare problem and no one really can tell me where should i start to find this problem.
    I have think it might be injector that stuck in 100% open.

    I'm not good and mechanic and engine problems.. I have spare 88T engine in pieces and getting new parts for it. I just hope i could find what is the problem in my org. engine.
    Jukka Kivinen - Europe / Finland - '88 Turbo 2+2 Targa
    Datsun Nissan Sports Cars of Finland
    http://www.z31turbo.com / http://www.z31na.com

  • #2
    Doesn't sound like a serious mechanical problem. Sounds like you might have a vacuum leak related to an idle valve or something. A vacuum leak would cause it to run rich. Running rich is what is causing all the smoke and poor running (and no boost).

    I'll let someone else chime in...
    BLOZ UP.com
    It is not recommended to confirm proper installation by driving into walls or other barriers as this could cause personal injury or damage to the vehicle.

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    • #3
      or maybe his oil return line and turbo are being the problem....

      hard to say remotely

      Comment


      • #4
        The black smoke would point to a very rich mixture which would explain the lack of power. I also agree that it's probably not mechanical, but most likely fuel system related. If you have thick, visible black smoke at all times under acceleration then your car is running WAY too rich (probably in the 10's or less). These will come a point when the mixture is so rich it will fail to ignite properly, and you won't even be able to accelerate past that point. This is what I think is happening, but as for why... I can't explain. An air leak behind the maf would cause the enleanment, so that's most likely not it. The most likely situation is a bad or dirty MAF, or bad connection to the MAF itself (check the connector and all applicable wiring). If the ECU is going into limpback mode (when the maf is disconnected or the signal is way off) that would explain the black smoke and why you can't accelerate.

        Is that dyno sheet displaying crank HP and torque? A 5 degree retard on timing might explain that power loss? Did you have a wideband O2 meter hooked up to the car? That's probably your best diagnosis utility at this point.

        Anyone else have any ideas?

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        • #5
          Jason84NA2T wrote: The black smoke would point to a very rich mixture which would explain the lack of power. I also agree that it's probably not mechanical, but most likely fuel system related. If you have thick, visible black smoke at all times under acceleration then your car is running WAY too rich (probably in the 10's or less). These will come a point when the mixture is so rich it will fail to ignite properly, and you won't even be able to accelerate past that point. This is what I think is happening, but as for why... I can't explain. An air leak behind the maf would cause the enleanment, so that's most likely not it. The most likely situation is a bad or dirty MAF, or bad connection to the MAF itself (check the connector and all applicable wiring). If the ECU is going into limpback mode (when the maf is disconnected or the signal is way off) that would explain the black smoke and why you can't accelerate.
          I'll check maf connection when i can access my car again.

          Jason84NA2T wrote: Is that dyno sheet displaying crank HP and torque? A 5 degree retard on timing might explain that power loss?
          Engine power i was told..

          Jason84NA2T wrote:
          Did you have a wideband O2 meter hooked up to the car? That's probably your best diagnosis utility at this point.
          Not yet.. Will be this summer.
          It would be easyer to find problem if it shows more ofter. Few times in summer is pretty hard to use diag.
          Jukka Kivinen - Europe / Finland - '88 Turbo 2+2 Targa
          Datsun Nissan Sports Cars of Finland
          http://www.z31turbo.com / http://www.z31na.com

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