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Thread: 1.8VVT Don't neglect spark plug change!

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    Exclamation 1.8VVT Don't neglect spark plug change!

    Hi,

    New to Vectra, new to Forum: hope I might save somebody some trouble and expense...

    My car is a '57 plate with 63K (warranted) bought at auction last week, with service stamps at 24K and 45K, so I was planning a service very soon.

    Third day I was driving it, started to misfire and the ECU warning light came on. A friendly neighbour hooked up the TECH2, which showed 'misfire on cylinder 1'.

    I'm sure the plugs were the ORIGINAL ones! Virtually no centre electrode left and hence a gap of about 2.0mm instead of 0.8. Sadly, replacing the plugs did not solve it - I had to replace the COIL PACK too!!

    This makes sense because the excessive gap would put a greater 'strain' (ie more than double the voltage) on the coils which seems to have caused the internal insulation on one or more to break down.

    So - if only I'd changed the plugs a day earlier, I could have saved £90.

    All part of life's rich pageant
    Peter
    Last edited by peter_; 16th December 2010 at 21:28. Reason: typo D'oh!

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    Peter yeh blob on with that, ive got a 1.8vvt sri on an 06 done 47k with I think original bosch plugs from new, no centre electode left AA found misfire on 2 cylinders, put new plugs in but NGK's ZFR5F, still didnt run right, I thought it was these plugs at first but its the coil pack like you said, the AA mech said if it still runs crap after new plugs try a coil pack, bought the original Delphi £90.
    ALLS I WOULD SAY IS CHANGE YEH PLUGS EVERY 20K

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    Vehicle : vectra c

    Trim : sri

    Engine : 1800 vvt

    Year : 2007

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    i change mine once a year when i give mine the full monty its daft not to..still had to put a coil pack on about 2 months ago 64 quid all in from autovaux trade price

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    I put a set of VX plugs in my none vvt, 10,000 mile(12 months) later thought I would have a lookie see if they were ok as mpg had droped a bit, I was very surprised to see that although the plugs looked in perfect condition/ colour ect, the gaps were all over the place/all three on each plug were different some massive some nearly closed up,, put a set of bosch super in then checked them after 10,000 miles,,,perfect.. perhaps the VX plugs were a faulty batch,

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    Regular Member jimmyred's Avatar
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    yep I have had same issue exactly, slight misfire which turned into severe misfire...changed plugs mostly fixed it but needed new coil pack to get rid completely. Z18xe

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    Smile

    Got my new Genuine Delphi Coil Pack today, 2 mins to fit, runs sweet as a nut again,

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