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Thread: Spark Plugs

  1. #1
    Regular Member kentish_bloke's Avatar
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    Vehicle : Insignia

    Trim : Elite

    Engine : 1.8 VVT

    Year : 2009

    Mileage : 42800

    confused Spark Plugs

    ok, heres a couple of questions.

    i just fitted the bosch super 4 spark plugs to my 2004 1.8 LS. started it & all seemed ok, untill it started running lumpy at idle & when revving the engine there was ALOT of hesitation. i also noticed the orange engine symbol was lit (NOT flashing) on the dash.

    so, i disconnected the battery & left it for an hour or so while i did something else. reconnected the battery & still the same.

    then i decided to replace the original spark plugs. started the engine & it seems to not run lumpy, but the orange engine symbol is still lit.

    i tried the instructions on the how to to get any fault codes & got 0301 which equates to a misfire on cylinder 1.

    my questions are, which is cylinder 1 & what could the cause & solution to the problem be?

  2. #2
    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

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    Cylinder #1 is normaly the one at the cambelt end of the engine.

  3. #3
    Regular Member kentish_bloke's Avatar
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    Year : 2009

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    ok, cheers, thats a start. unfortunately i didnt get the code before i changed the plugs back to to originals, so they may be ok, im guessing it may be the coil pack thats at fault

  4. #4
    Ex Vec-C Admin ed taylor's Avatar
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    Year : 04

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    I did have to replace the coil pack on my wifes Vectra B. That give a sort of misfire, abit like a "duff" spark plug lead.

  5. #5
    Regular Member Swaite53's Avatar
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    If I've read correctly, are you saying that now you've changed back to your original plugs, and the engine runs fine, but the warning light is still lit?

    Was the car running fine before changing the plugs?

    It may be worth disconnecting the battery again, while leaving your original plugs in. It could be the old code it was reporting with the new plugs, and not a problem on the car.

    I recently had a misfire on cylinder 1 and the emission light was lit, and the problem was the ignition module (my own fault for washing the engine and not covering it up properly).

    It could just be that one of the new plugs are faulty, or maybe incompatible.

  6. #6
    Regular Member kentish_bloke's Avatar
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    Trim : Elite

    Engine : 1.8 VVT

    Year : 2009

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    yes you are correct on all counts. ive been driving it for 2 days & no sign of any misfire, just the orange engine light on the dash being lit.

    i will have a go at disconnecting the battery again & see if that clears the light. bit annoyed if its 1 new plug thats faulty!

    i will update later on.

    if anyone else has any ideas, i would be very grateful to hear them.

  7. #7
    Regular Member kentish_bloke's Avatar
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    Engine : 1.8 VVT

    Year : 2009

    Mileage : 42800

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    right, quick update.

    had driven the car for a couple of days with the orange engine symbol illuminated. went out sunday lunchtime, light still on. didnt drive it again until monday evening, so over 24 hours, and hey presto, no engine light on! i didnt even have to disconnect the battery! weird!

    so, my next question is, are the new spark plugs i fitted the correct ones? they are the Bosch Super 4 FR91X 0242222505. anyone any ideas? i got them from fleabay, the seller said they were the correct ones, have my doubts now!

  8. #8
    Regular Member Swaite53's Avatar
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    I believe that the warning lights will go out after about 10 engine starts if is not currently recording a fault (which means that whatever the fault was, has gone [at the moment]).

    The light that you had on sounds like the emissions light, which will illuminate if the sensor thinks the car's emissions may be too high.

    Whatever the problem is, it's almost certainly related to the Super 4 spark plugs, seeing as it was fine before, and now fine since you have taken them out.

    Did you set the gap on the spark plugs?

    If the spark plugs were incorrectly gapped, or the wrong type, it may not be burning the fuel as efficiently as it should, which could cause the problem you described.

    The 'standard' plugs required for the 1.8 are Bosch FQR 8 LEU2 with a gap of 1.35 mm. I don't know what the spec would be for a super 4 plug. Halfords may have a comparison chart, or you could email this company:

    http://www.powersparks.co.uk/boschorderpage.htm


    Hope to help.

    PS. I put these on a 1994 Astra years ago, and I really didn't notice any difference at all. It was only the 1.4 (60bhp), so it didn't have anything to start with - maybe it makes more of a difference on a more powerful engine.
    Last edited by Swaite53; 28th July 2009 at 18:15.

  9. #9
    Regular Member kentish_bloke's Avatar
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    Year : 2009

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    bump

  10. #10
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    sounds like a plug problem to me, I've cracked the ceramic part when fitting new plugs and got this reaction. Check each plug carefully, its easily done. EM lights can disappear on their own if the fault has cleared. The code will still be stored but no light illuminated. The other possibility would be a loose HT lead on one plug when you fitted the new set, could still give a misfire.

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