Nissan 3.3 fuel injection question





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  1. #1
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    Question Nissan 3.3 fuel injection question

    My fuel consumption on my 06 3.3 is bad and erratic. I varies from 7.5 to 4.5 km/litre. I have fitted a Dastek chip and it made a difference after fitment and then became erratic (on long trips again).

    She does this on long open road trips down to the coast. On arrival there it is as if she want to die below 1000 rpm. She kept this symptom on arriving back in Sasolburg.

    I suspect that one of the sensors feeding the ECU is giving the wrong reading and thus the FI wrong mapping. (I understand how the mapping works on my Yamaha bike - it uses RPM and throttle position / carb slide position) I unplugged the mass air flow sensor on air box inlet pipe and this worsened the symptoms (missed badly when revved). Plugging it back however, made her run smooth again. It was if something was "reset". I suspect she is now back to her 7.5km/l best behavior.

    Questions:
    what are the input signals to the FI ECU other than RPM?
    has someone else experienced this?
    any solutions / suggestions?
    Last edited by ArmOost; 2009/11/23 at 07:23 PM. Reason: correction

  2. #2
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    Default

    If the 3.3 is the same as the 3.0 (VG30E) you will have the following.

    Mass Air Flow meter.
    RPM
    Water Temp

    There is a Throttle Position Sensor as well, but it is only used when in "limp" mode.
    Kobus

    Nissan

  3. #3
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    Thanx Kobus, I suspect it will be the same for 3.3.

    Is the mass air flow meter the sensor on the Air box inlet pipe? If so I thought it is an air inlet temperature sensor. I will then have to update my first post.

  4. #4
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    Armand

    Yes, the sensor is on the air intake. Mine has 4 wires. 5V, 0V, and signal (0 - 5V) back to the ECU. 4th wire is unused.

    If you disconnect it, it goes into limp mode. Max 3000RPM and very bad idling.

    Check the water temp sensor. It is close to the sensor for the temp gauge in the dash. If you get the wrong signal from this sensor, the ECU may think the engine is still cold, and will adjust the idling valve and fuel mixture.
    Kobus

    Nissan

  5. #5
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    I suspect it is the mass airflow meter. After unplugging and plugging it back, she was fine again. Removing the power must have reset it.

    When she plays up again, I will measure out the idle readings from it.
    Last edited by ArmOost; 2009/11/23 at 07:25 PM.

  6. #6
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    May be a bad connection in the plug. While idling, wiggle the wires at the back of the plug.

    I had a similar problem with mine. Occasional bad behavior.
    Kobus

    Nissan

  7. #7
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    also make sure there is no bugs or stuff stuck on the "siffie" infront of the airflow sensor! this has caused me a few headaches untill i sealed the airbox on the inside! also see if your airfilter has a rubber seal on the inside at the arflow meter end, mechanics tend to remove the rubber and never put it back
    "Blue Thunder"
    Gert Ferreira
    2004 Hardbody 3.3 V6 D/C 4x4 SEL

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