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VF Evoke missfire (shudder) at idle and at 1500rpm

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Milesvtcalais, Feb 23, 2020.

  1. Milesvtcalais

    Milesvtcalais Member

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    Hi all, putting this post up for my mum as I'm trying to do my best to not have her spend money at a mechanic. So story goes like this
    Mums car (2014 Holden evoke sports wagon) has a 3.0 v6 so basically a lfx or an alloytec, about 10 months ago mums car developed a slight missfire at around 1500rpm and ran slightly rough at idle, over time this just continued to get worse and worse to the point where the car wasn't driveable, Sometimes it would idle smooth and them sometimes when you came to a stop it would drop to like 400rpm and the whole car would start shaking like a top fuel drag car. Ended up being a cracked spark plug... recently this problem has started again but its seemed to have gotten worse, it only used to do it when it was properly warm after maybe 30 mins of driving but now it does it when it's cold... runs fine when dry revving but if you hold it at 1500rpm you can feel a very faint vibration from the motor, then if you hold it in gear or even accelerate up a hill or a high stress area the car just shudders and misfires again, once you get past this rpm it feel completely normal and just turns into a happy well running v6 commodore. Engine light only came on once 10 months ago and hasn't came on since.
    Does anyone have any suggestions on what I could be? I've checked the same spark plug and it's still brand new. Possibly a coil pack or a vaccume leak. Car has 120.000ks on it so it's not necessarily high considering dads alloytec has almost 300k and runs smooth as.
    Thanks all
    If you need any information please ask :)
     

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