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Thread: Coil Pack & Plugs

  1. #1
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    Default Coil Pack & Plugs

    Hey folks,

    Got the car back from having its LPG installation yesterday (ill post pics and thoughts in the LPG thread)

    The chap who did the installation said that when he was doing the tweaking of the LPG ECu, recommened that better fuel consumption/and general running could be achived if i replaced the coil pack and probably the plugs.

    Plugs i am happy with, they are quite straight forward

    Now, what is a coil pack? and are they an easy item to install yourself?
    Are they expensive? Its on a 2L Turbo engine btw.

    I have done a few searches and prices seem to vary quite a fair bit up and down. If i am going to replace, is there a recommended one for my particular engine?

    Sorry for my igonrance!

  2. #2
    Regular Member disco dan's Avatar
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    anything around £100 for a new GM one, VX quoted me £136 but ive seen them the bay for £80.

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    Cheers,

    So, is there anyway i can figure out which one might be causing the problem? Would a OBD Code Reader give me any indication... I can get my hands on an Autel 509M if that would help.

    Doing a bit more searching, it appears they are pretty straight forward to replace... even for me!!
    Last edited by Aidi; 4th February 2012 at 14:06.

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    Bit of a shameless bump i'm afraid...

    Anyone with an idea on how to check if a coil pack is on its way out or not working at optimum?

  5. #5
    Regular Member Ben50n's Avatar
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    As coils kick out over 50,000 volts, they arent really user testable. garages may be able to test them?

    Normal signs of a failing col, would be a misfire and if you compared the plugs, the duff coil would mean you would not be getting a full spark and therefore probably not such a good burn.

  6. #6
    Ex Vec-C Admin Deztroyer's Avatar
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    Things You'll Need

    Voltmeter
    1
    Open the bonnet

    2
    Locate the coil pack in your engine by following the spark plug wires from the spark plugs; the wires are connected to the coil pack. Depending on your particular vehicle model, you may find the coil pack mounted on one side or the back of the engine.

    3
    Unplug the spark plug wires from the coil and label the wires if necessary for proper installation.

    4
    Unplug the pack's electrical connector and remove the coil pack from the engine, using a wrench or ratchet and socket if necessary.

    5
    Set your ohmmeter to the 20000 ohms range. Turn on your meter and touch the spark plug wire terminals on one of the coils with the meter leads. You may get a reading between 5000 to 15000 ohms, depending on your particular model. This checks the secondary resistance.

    6
    Set your ohmmeter to the 10 ohms range, and touch the terminal B+ (usually the center prong on the coil pack electrical connector) with one of the meter test leads, and touch the corresponding coil prong on the electrical connector with the other test lead. You may get a reading between 0.3 and 1.0 or more, depending on your particular model. This checks the primary resistance on each coil.

    7
    Repeat steps 6 and 7 for each coil in the pack assembly, and compare your resistance readings to the specifications given on your vehicle service manual
    If your readings are out of range, replace the coil or coils as necessary.

    0-Large smile ......every time it's driven

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    Cool! If its dry tomrrow ill give it a go and see what the results are.

    Would never have known unless the LPG install guy had mentioned it. No sign of a misfire or anything, but his LPG ECU Mapping software said it showed it up and said it could be causing the engine to consume more fuel. So certainly worth checking out.

    Thanks for the reply

    Rgds
    Aidi

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    There's no coil pack on the 2.0T, there are 4 individual coils.

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    Yep, found that out mate, i guess i could have worded it a bit different.

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