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Air temperature sensor on VN s1....idle issues?!?

Discussion in 'VN - VP Holden Commodore (1988 - 1993)' started by Susanna, Apr 10, 2019.

  1. Susanna

    Susanna New Member

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    Hello all
    My VN has been running all good....till this morning....doesn't like the cold . It tends to stall/hesitate asap you press the throttle a bit. Do we need to install a new air temperature sensor?. Oil I'm using is 20/50. It's got great acceleration,but I've noticed the idle I'd on occassions irratic...yes I've installed new IAC motor,new TPS,new leads and plugs, pcv valve all cleaned up.
    Just found out its got a power chip memcal....are they good or ##!@. I do have caused and sports exhaust.

    One at a time....idle issues/, hesitate...anyone experienced the same....if so what's the cause and fix please.
    Thanking you all in advance for your help!!!!
     
  2. HarryHoudini

    HarryHoudini Active Member

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    No Air temp. sensor on a VN.
    Looking for trouble changing the chip,some kinda work, some stuff everything up particulary when Cam timing is off with lobe wear and sloppy lifters.
    I would start by installing a standard Computer,$50 at a wrecker, and see if it makes a difference.
    Also symptoms you describe sound like contaminated fuel or a partially blocked/faulty fuel pump or even a faulty injector.
     
    Last edited: Apr 11, 2019
  3. Susanna

    Susanna New Member

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    Sounds good. Will try step by step... Ecu first.
     
  4. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    Well that's not strictly true, it has an air temp sensor but it is located in the manifold. It will be covered in oil/gunk like the rest of the inside of the intake manifold but most likely not the cause of the trouble and it can't hurt to clean it but it's at the back of the manifold and can be a PITA to get to.

    If the car has been running fine previously I'd not be so quick to blame the tune.

    How old is the fuel filter? how dirty is the air filter? Have you cleaned out the throttle body? Have you tried an idle reset?
     
  5. Susanna

    Susanna New Member

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    Have done a reset....and all good so far. But I'm Gunna clean the throttle body erc
     
  6. HarryHoudini

    HarryHoudini Active Member

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    I stand corrected,we always called it the MAT sensor.
     
  7. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    Well yes a MAT sensor, manifold air temperature but it does the same job as the Air intake temperature sensor just a different location and the MAT has a real influence on the fuelling too.
     
  8. 91SS

    91SS Member

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    If it's like a loping idle check fuel injector o rings for Air leaks. A few drops of water on bottom of injector if it sucks it in you have air leak. Not to much water though. Check also manifold gaskets.
     

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