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  1. #1
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    Default spark plug leads and spark plugs

    Please help How do test my spark plug leads and what to check for in my plugs for defects as my 308 has a miss on the drivers side bank.i have twin exhausts which dont have a connector and one side pops and the other purrs

  2. #2
    Sure why not? 76lxhatch's Avatar
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    You can test the end to end resistance with a multimeter, they will differ based on length but that might help find one that is completely shot. Of course it could be breaking down under heat or have a break in the core which only shows up when it moves around which makes it difficult.

    The other way is to check the plugs, if its missing badly it should show up different. The old way used to be to pull the leads one at a time with the engine running and see which makes little to no difference - this is a good way to get a shock though and I don't recommend it if you have an electronic ignition.

  3. #3
    Do you ever leave? DR327VK's Avatar
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    One way to test, which cyl is not firing properly is to use a lazer heat gun on each exhaust pipe out of the head and get the reading of each cyl, the lowest is the one thats not burning proberly!
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  4. #4
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by DR327VK View Post
    One way to test, which cyl is not firing properly is to use a lazer heat gun on each exhaust pipe out of the head and get the reading of each cyl, the lowest is the one thats not burning proberly!
    a bit simpler ....
    is to use one of the latest 'powered' timing lights -
    the ones that just clip over the #1 plug lead and are used
    to check your ignition timing

    just clip them over each plug lead til you find the one that does NOT show
    on the timing light (works every time for me)
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  5. #5
    Do you ever leave? DR327VK's Avatar
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    Quote Originally Posted by Smitty2 View Post
    a bit simpler ....
    is to use one of the latest 'powered' timing lights -
    the ones that just clip over the #1 plug lead and are used
    to check your ignition timing

    just clip them over each plug lead til you find the one that does NOT show
    on the timing light (works every time for me)

    I useto lick my thum and touch each exhaust pipe! the one that dosen't fizzses my thum was the coldest! hehehe just a real quick way to do it when your racing and need a quick diagnose!

    I do not reconmend this but it works fine for me!
    SA AUTO TEK
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  6. #6
    casual poster jezza372's Avatar
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    i have never licked my thum and touched the exhaust.
    but i have used one of those little hand pump squiter bottles to spray at the exhaust which works good.

  7. #7
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    i have found the plug thats stuffed .I have replaced all plugs and leads (8mm) and kept them for spare when the other plug fouls up.Is it ok to put in a warmer plug on that 1 and only cylinder?

  8. #8
    Do you ever leave? DR327VK's Avatar
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    Yes it should be ok to put a hotter spark plug in!

    Was it oily? valve stem? rich?
    SA AUTO TEK
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  9. #9
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    slightly oily the rest looked ok not rich and she doesnt use any oil probably not noticable with only one plug fouling

  10. #10
    Do you ever leave? DR327VK's Avatar
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    Fitting one hotter plug should fine then!
    SA AUTO TEK
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  11. #11
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    cheers

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