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throttlebody limpmode

Discussion in 'VT - VX Holden Commodore (1997 - 2002)' started by Wratha the risen, May 18, 2019.

  1. Wratha the risen

    Wratha the risen New Member

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    Which dashboard light or warning light/code comes on to indicate the throttle body sensor is buggered? Car has stopped, how do I get it into limpmode to get it home?
     
  2. losh1971

    losh1971 Well-Known Member

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    V6 or V8?
     
  3. losh1971

    losh1971 Well-Known Member

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    What makes you think one of the TB sensors have made you not start? It's unlikely to be one of the above is all. Limp mode is automatic is all and you don't flick a switch and get going again. Unfortunately if it won't go after waiting 30 mins its a tow truck.
     
  4. Wratha the risen

    Wratha the risen New Member

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    It’s a v6 echtech motor, it may have just run out of fuel, n taking a while for the fuel pump to do it’s thing.
     
  5. Wratha the risen

    Wratha the risen New Member

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    Just what a mate said
     
  6. Wratha the risen

    Wratha the risen New Member

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    It’s just what a mate said, it may have run out of fuel n is taking a while for the fuel pump to do it’s thing
     
  7. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    If it ain't pumping now it ain't gonna start pumping in 10 or 12 or 17 or 30 minutes cause it's taking a break...

    Limp mode, it either starts and goes into limp mode or it doesn't start because something is really fucked.

    Does it crank over?
     
  8. losh1971

    losh1971 Well-Known Member

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    Well guess you need to refuel and see then. Don't let the pump run for more than 15-20 seconds and not start or you will burn out the pump. That's if it has indeed run out of fuel.
     
  9. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    The PCM will only prime the pump for a few seconds and then it won't run again till the engine runs or until you cycle the ignition or you crank the engine long enough that the oil pressure switch closes ;)
     
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  10. losh1971

    losh1971 Well-Known Member

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    So you're saying that the PCM recognises it doesn't have fuel pressure and shuts the pump off? I was of the belief it would keep trying to pressurise until it did. That's a good safety mechanism. My old bus would keep going if the tank was empty because the rail wouldn't pressurise so the pump would keep running until it stopped due to burn out. Pretty sure the ute pump won't stop if it's out of fuel. I'm fairly sure it kept trying to prime when I ran out of fuel last year.
     
    Last edited: May 18, 2019
  11. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    No. The PCM primes the pump for about 5 seconds and then shuts it off. On the ecotec motors the fuel pump is primarily fed via the oil pressure switch which is a safety mechanism so that in the case of an accident and the engine shuts off so does the fuel pump. On the earlier V6 motors were wired similar but it didn't work quiet the same way.

    Next time you get in the ute turn the ignition to ON and listen, you should hear the pump prime and then shut off.
     
  12. losh1971

    losh1971 Well-Known Member

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    Yeah it does shut off after a few seconds. Will it still shut off with an empty tank?
     
  13. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    Yes because the priming function works off a timer.
     
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  14. losh1971

    losh1971 Well-Known Member

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    did you see my last PM?
     
  15. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    No, let me check. Been a long couple of weeks after shoulder surgery.
     

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