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Astra G 1.6 16v not starting - Z16XE engine - help!

Discussion in 'Astra, Corsa, Zafira, Meriva, Adam, Agila, Tigra & Nova [Includes AstraVan & ComboVan] owners forum' started by Steviebitt, Dec 27, 2011.

  1. marks152

    marks152 Well-Known Member

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    Or is the low vaccum as a result of a really low idle.
     
  2. Steviebitt

    Steviebitt Member

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    Location:
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    Drives:
    2001 Astra G 1.6 SXi
    Hello lads,
    When the car is below 90 degrees C it will reluctantly allow me to rev the car, but revs slow until it hits about 3200rpm.
    The car idles OK when its cold/warmish but it's really gutless.
    Only enough power to move it around on the drive.

    When the car hits 90 plus degrees C, the idle just plummets to below 500 rpm and then will not tolerate any touch of the throttle.
    It changes between the two states within a second, like something has switched.

    I have started to refer to these to different states as:
    Hang over mode (<90 degrees C)
    Vomit mode (>90 degrees C)
    The car would not start at all until Mark suggested a set of plugs.

    If I re-start the car when it's warm it really does not want to start.
    When it does start eventually start it goes into hang over mode for about five seconds then goes back into vomit mode again.

    I think the data your looking at may be from when car was ticking over like it was going to die at the time (above 90 degrees C aka vomit mode).
    I may be wrong, it wouldn't be the first time. Ha ha
    I did give some live data from when it was cold too (the rpm gives it away)

    I hope this helps.
    I've never come across this before.
    I really appreciate all your help and observations.
     
  3. Steviebitt

    Steviebitt Member

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    Location:
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    Drives:
    2001 Astra G 1.6 SXi
    PS there are no whistles or sucking noises, that was one of the first things I had looked for.
    It does behave like a vacuum leak when its cold. But there isn't one.
    I have ruled out the EGR too as I made a blanking plate. No difference.
     
  4. gerinemo

    gerinemo Active Member

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    Location:
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    Drives:
    2000 Astra G Comfort
    You could try spraying carb cleaner around the inlet manifold / injectors/ when idle is poop see if the revs pick up suggesting an air leak
    or plug the exhaust with a rag over your hand see if you can hear air escaping up front end
     
  5. marks152

    marks152 Well-Known Member

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    Its as if a pipe has been knocked off. You did say this issue occured after changing the oil. Was anything else done. I remember when i had a new clutch about 3 months ago when the missus went to pick the car up it was sounding like a bag of spanners and wouldnt rev up. It turned out they had knocked a pipe off by mistake. I wasnt there so i dont know which pipe it was but the missus said that the guy said it was just a pipe that they must have got pulled off by mistake.
     
  6. Steviebitt

    Steviebitt Member

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    Location:
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    Drives:
    2001 Astra G 1.6 SXi
    Thanks gerinemo, tried the carb cleaner (sort of...brake cleaner). Got worse while spraying. Ran better after a clean.
    Blocking the exhaust would only show up an exhaust leak though (there isn't one by the way).
    Thanks for the fresh eyes though, any input is welcome.
    I can't wait to find out what fixes this. I'll give a detailed breakdown (bad choice of word I know) when I sort it.
     
  7. Steviebitt

    Steviebitt Member

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    Location:
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    Drives:
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    The only pipe I can see that could come off comes from the tank ventilation switch which is located at the rear of my air filter unit.
    Definitely on, I have checked by hand and I can see the whole length. Checked around the rear of the intake system for wheezes with my hands.
    I think I'll run it cold and spray some WD40 around the intake to see if the rev's fluctuate.
    Back in a minute.
     
  8. gerinemo

    gerinemo Active Member

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    Location:
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    that vent valve is a hard plastic pipe that runs along the rear of the intake pipe then changes to a rubber pipe about 3" long and plugs onto the rear of the carb
    i have found these disconnected but not with the symptoms you describe

    the only time ive seen what you describe was when i disconnect the map sensor which hangs on the bulkhead with a rubber pipe and 1 electrical connecter
     
  9. marks152

    marks152 Well-Known Member

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    Map sensor on a Z16XE bolts straight onto the manifold so theres no rubber pipe and cannot become disconnected by mistake.
     
  10. gerinemo

    gerinemo Active Member

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    that rules that out then :)
     

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