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Thread: 2.8 Missfire

  1. #1
    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

    Engine : 2.0

    Year : 2000

    Default 2.8 Missfire

    Right then folks I have a misfire at WOT.

    I have read a few threads about this both here and on Saab forums and it would apear to be a spark plug issue.

    So whats the best route to take?

    Should I just fit new plugs?
    Is there an uprated plug?
    Can I get away with just regapping the plugs?


    Thank you

    Stephen

  2. #2
    Regular Member AntSSSS's Avatar
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    Vehicle : Vectra Estate

    Trim : SRI

    Engine : CDTI 150 (Z19 DTH)

    Year : 2008

    Mileage : 100k

    Default

    My advice would be new GM ones gapped correctly at 0.8...

    Front bank is easy to change, rear bank needs a little strip down to get too but only a 30 min job.

  3. #3
    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

    Engine : 2.0

    Year : 2000

    Default

    Just found a post from Spoons on VXRO

    "Engine misfires/engine juddering. This can either be due to spark plugs incorrectly gapped (0.8mm on mapped cars, and 0.7mm on high boost mapped cars). Or coilpacks failing. Coilpacks can be sourced for £50 each, so don’t pay the £250 each that Vauxhall quote. Other issues may relate to upgraded engine mapping from an independent tuner."

    As my car has been mapped I will start with the regap to .8mm. Or should I just upgrade to iridium spark plugs at the same time and get these gapped to 0.8mm?



  4. #4
    Regular Member Ziggy's Avatar
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    double post
    Last edited by Ziggy; 27th March 2012 at 11:11.

  5. #5
    Regular Member Ziggy's Avatar
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    Trim : 9-3 Vert

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    Quote Originally Posted by AntSSSS View Post
    My advice would be new GM ones gapped correctly at 0.8...

    Front bank is easy to change, rear bank needs a little strip down to get too but only a 30 min job.
    Sorry just seen this post. Ill get some ordered.

  6. #6
    Regular Member AntSSSS's Avatar
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    Vehicle : Vectra Estate

    Trim : SRI

    Engine : CDTI 150 (Z19 DTH)

    Year : 2008

    Mileage : 100k

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    Quote Originally Posted by s_zigmond View Post
    Sorry just seen this post. Ill get some ordered.
    I changed chrisvectra's on his VXR and his engine was as smooth as silk

    Defo worth changing the plugs before looking at coil packs. You often find that they are worn as people cant change them due to the rear bank.

  7. #7
    Regular Member Ziggy's Avatar
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    Cheers mate. Will sort ASAP

  8. #8
    Full Member Big Sig's Avatar
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    Quote Originally Posted by s_zigmond View Post
    Just found a post from Spoons on VXRO

    "Engine misfires/engine juddering. This can either be due to spark plugs incorrectly gapped (0.8mm on mapped cars, and 0.7mm on high boost mapped cars). Or coilpacks failing. Coilpacks can be sourced for £50 each, so don’t pay the £250 each that Vauxhall quote. Other issues may relate to upgraded engine mapping from an independent tuner."

    As my car has been mapped I will start with the regap to .8mm. Or should I just upgrade to iridium spark plugs at the same time and get these gapped to 0.8mm?


    If your going to all the trouble of regapping them then change them at the same time.
    Now I need a turbo to keep up!

  9. #9
    Regular Member Ziggy's Avatar
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    Vehicle : Saab

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    Year : 2000

    Default

    New plugs were fitted, and it has improved, but I still have what appears to be a slight missfire at 3.5k rpm in 3rd. I have no error codes though and im no longer getting the cat warning.

    Anyone any ideas? If its a coil pack, how do I find out which one?

  10. #10
    Full Member gibbon7000's Avatar
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    Had this problem only the other week on my 2.8. If it is the coil pack it will give up soon and the EML will come on. Get the codes read. I was lucky it was cylinder no.2 which is front left. I'm sending you a PM

    My other car. 1972 1641cc slammed beetle. On the road finally!!

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