Question about 1997 Infiniti.5 Q45

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  • fayez7001 Jul 12, 2010

    thank you dude for quick reply , let me explain something to you, i really did all those things you've written a while ago but still the engine has not ran that well especially when i drove it under 100km even though there's no engine vibration

  • fayez7001 Jul 12, 2010

    there are some other things i really doubt about them
    1- idle control valve or EGR valve

    what do you suggest about that



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  • 17,970 Answers

Replace your plugs, wires, cap and rotor, and fuel filter and go from there; probably low fuel pressure. Get your fuel and air filter replaced, could be the fuel injector(s), fuel pump... I doubt it's your plugs if you get a tune up every 3k miles.

Make any scan to know if you have fault codes there and tell us news.

Posted on Jul 12, 2010

  • ZJ Limited
    ZJ Limited Jul 12, 2010

    There are several possible causes to this, generally timing is the
    issue. timing is affected by so many things though. to start off with if
    this came on say overnight you may have a very tired timing belt or
    chain and it has jumped a tooth. next there are electronics that could
    be needing replaced specific to the distributor. vacuum leaks and a bad
    vacuum module can most certainly create this.

    When at an idle vacuum is
    present and idles up the engine, running faster this is not needed and
    vacuum has decreased. I doubt fuel is the issue if it runs well faster
    unless its somehow flooding in which case it would lope slightly at
    first and stronger the longer it idles till it stalls. motor mounts
    cause a hard **** when you accelerate and let off and lots of body
    vibration. bad rods almost allways knock and oil presure drops off
    badly. your engine would be much louder.

    If the issue is an engine shake
    you could have a weak or bad spark plug wire, plug itself, distribtor
    cap dirty fuel filter (common problem) a sticking lifter (cam follower)
    weak valve spring, or even two spark plug wires crossed (it happens!)

  • ZJ Limited
    ZJ Limited Jul 12, 2010

    Insufficient EGR Flow show fault code P0401 in the scanner... what does that mean: EGR stands for Exhaust Gas Recirculation. It is part of the vehicle
    system, and is used to reduce combustion temperature and pressure to
    Oxides of Nitrogen. There are generally three parts to the EGR system:
    the EGR
    valve, an actuator solenoid, and a differential pressure sensor EGR
    These things work together to deliver the correct amount of
    recirculation based
    on engine temperature, load, etc. The P0401 code means that OBD
    detected an
    insufficient amount of EGR.


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    You may notice drivability problems such as pinging (a.k.a.
    pre-ignition knock) when the engine is under load or the vehicle is at
    higher speeds. There may also be other symptoms.


    A code P0401 most likely means one or more of the following has

    • The DPFE (differential pressure feedback EGR) sensor is faulty and
      to be replaced

    • There is a blockage in the EGR (tube), most likely carbon buildup

    • The EGR valve is faulty

    • The EGR valve may not be opening due to a lack of vaccuum

    Possible Solutions:In fixing this code, it is quite common for people to just replace
    the EGR valve only to have the OBD code return. The EGR valve is not
    always the culprit.

    • Use a vacuum pump and pull the EGR valve open while monitoring
      engine RPM's
      & DPFE voltage. There should be a noticable difference in RPM's
      with the
      EGR open

    • Clean out the EGR valve and/or tubing to remove deposits

    • Check the voltage at the DPFE, compare to specified values (refer
      to a repair
      manual for your specific model)

    • Replace the DPFE sensor (with a good quality / OEM one)

    • Replace the EGR valve

    Test it.



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