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VF SV6 rough idle. De-stressing exhaust ???

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Vf Lightning, Sep 26, 2019.

  1. Vf Lightning

    Vf Lightning New Member

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    G'day guys,
    Today I had an Ex-force 2.25 catback system fitted to my VF SV6 and now the car idles rough when in drive. Under load no issues at all. Gets worse with the Aircon on. I spoke to Holden and they said the new exhaust might need to be de-stressed. Anyone ever heard of this or have any idea what could be the cause ? Car idled perfect before exhaust was fitted. I took it back to the exhaust place and they checked the sensors and said they were fine.
    Any help would be appreciated.
     
  2. Milo 6.0

    Milo 6.0 Member

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    De stressed lol,really....
    Id like to know how the exhaust place checked the 02 sensors,the exhaust would flow a lot better than the stock one but unless you fitted high flow cats it shouldn't idle rough.Maybe get a scanner plugged in and check for codes,maybe they did fk an 02 sensor?
     
  3. Vf Lightning

    Vf Lightning New Member

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    I was thinking the same thing about the sensor. They just did a visual inspection checked nothing was loose.
     
  4. Milo 6.0

    Milo 6.0 Member

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    Seriously though,never even heard of the term de stressing the exhaust,sounds like a made up holden thing possibly.
     
  5. Vf Lightning

    Vf Lightning New Member

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    Yea I spoke to 2 holden dealers both said what's involved is loosening all exhaust parts then re-tensioning everything.
     
  6. lmoengnr

    lmoengnr Well-Known Member

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    With the exhaust at operating temperature.
     
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  7. Vf Lightning

    Vf Lightning New Member

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    Yes seems worse at operating temperature.
     
  8. Vf Lightning

    Vf Lightning New Member

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    Also right hand exhaust tip is vibrating worse than left side.
     
  9. Milo 6.0

    Milo 6.0 Member

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    I don't see how a new exhaust can make a motor run rough,the exhaust is rubber mounted and unless its touching something metal it wont make any noises and certainly wont make the motor run rough,im keen to see how this pans out.
    When you say running rough can you explain it a bit more?
    Idling low,shaking/stalling etc
    Has the battery been disconnected and reset the ecu?
    Definitely pull the codes.
     
  10. Vf Lightning

    Vf Lightning New Member

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    Battery wasn't disconnected.
    If I'm sitting at the lights in drive at idle I can notice the idle is slightly rough and will get worse if I turn the aircon on. Also looking at the exhaust tips when in gear the right tip vibrates worse than the left. Engine doesn't stall or miss under load. I'm beginning to think one of the o2 sensors has been damaged during the process or decided to fail ???
     
  11. Ron Burgundy

    Ron Burgundy Well-Known Member

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    Is it really rough idle or just vibration from the exhaust ?
     
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  12. Vf Lightning

    Vf Lightning New Member

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    I'd say it's like a shudder through the car when at idle. It's moderate but is worse when I turn on the aircon.
     
  13. Ron Burgundy

    Ron Burgundy Well-Known Member

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    I suspect it is vibration rather than rough idle..especially if you can visually see it like you mentioned. This happens when the pipes are not perfect shape and they get bolted on under tension/stress...
    Have a look at all rubber mounts and see if they are really stretched etc...
     
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  14. Vf Lightning

    Vf Lightning New Member

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    Yea checked all rubbers etc. Seems to be intermittent. Took it for a 5 minute drive stopped 5-10 times and nothing running spot on. Pulled into my driveway and it started again. Giving me the shits.
     
  15. Vf Lightning

    Vf Lightning New Member

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  16. Vf Lightning

    Vf Lightning New Member

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    Would you say holden are right ? That the exhaust needs to be loosened off and re-tensioned. I forgot to mention I'm not getting any fault codes coming up.
     
  17. Milo 6.0

    Milo 6.0 Member

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    Check the rear muffler exhaust hangers,the 2 bits of steel rod on the mufflers that go through the rear exhaust rubbers can be a bit long and touch the body.
     
  18. BlackVXGTS

    BlackVXGTS Well-Known Member

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    I can understand why Holden dealers wouldn't be interested in your exhaust problem, given you have changed the standard system. You can hardly expect them to be helpful.

    Nowadays it seems to be called "Exhaust System Alignment" rather than de-stressing. Don't understand your model, but check out the attached from the VF Service Manual. It may be of some benefit to you:
     

    Attached Files:

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  19. Vf Lightning

    Vf Lightning New Member

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    Good info. Thanks for that.
     
  20. Vf Lightning

    Vf Lightning New Member

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    Checked mate all clear.
     
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