How to change your sparkplugs
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This is a discussion on How to change your sparkplugs within the Maintenance, service, and repair forums, part of the Tutorials & DIY category; Figured this might be helpful for somebody. First you'll need to properly gap your selected spark plugs- factory calls for ...

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    Moderating on the run! Big Sky WRX's Avatar
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    How to change your sparkplugs

    Figured this might be helpful for somebody. First you'll need to properly gap your selected spark plugs- factory calls for .028-.031 gap, yours may vary depnding on model ie iridium or needs. Lots of info out there on choices of plugs- I won't go into any of it here.

    You'll need to use some kind of gapping device and you'll want an accurate gap. Here's the tool I use:
    Attached Thumbnails Attached Thumbnails sparkpluggapper.jpg  

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    We'll start on the drivers side, but first we'll have to make some room. The battery as well as the washer needs to come out,

    Two 10mm nuts on the battery, two 10mm bolts on the washer bottle and a connector:
    Attached Thumbnails Attached Thumbnails batterywasher.jpg  

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    Here's where the connector is on the washer bottle:
    Attached Thumbnails Attached Thumbnails washer.jpg  

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    Remove the battery and plastic holder. Move the washer bottle out of the way:
    Attached Thumbnails Attached Thumbnails washermove.jpg  

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    I'd highly recommend a few "speciality" tools to tackle this job. First a set of flex head sockets to get at the coilpacks, you'll use these on lots of jobs:
    Attached Thumbnails Attached Thumbnails flexsockets.jpg  

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    Next a flex spark plug socket:
    Attached Thumbnails Attached Thumbnails sparkplugflexsocket.jpg  

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    The spark plug socket has rubber inside of it to hold the spark plug:
    Attached Thumbnails Attached Thumbnails sparkplugsockettop.jpg  

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    A variety of extensions, I like the ones that are "lockable" so the extension doesn't come off the socket:
    Attached Thumbnails Attached Thumbnails spsocketwextens.jpg  

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    With everything out of the way, we'll first remove the coil packs. I undo the connectors to each coil pack first:
    Attached Thumbnails Attached Thumbnails coilpackconnector.jpg  

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    Next the coil packets themselves, 12mm (use the flex head socket). After the bolts are loosened, gently pull on the coil packs to get them off of the spark plugs:
    Attached Thumbnails Attached Thumbnails coilpackdriver.jpg  

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    Here's what the coil packs look like:
    Attached Thumbnails Attached Thumbnails coilpacks.jpg  

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    Your now ready remove the spark plugs. Use the spark plug socket on a extension, gently put it into the "hole" until you firmly have the spark plug on the socket. Using a ratchet remove the spark plug- shouldn't be in there too tight.


    We can now put your properly gapped new spark plugs in. Use the flex spark plug socket and a extension. You may want to put a light coating of antiseize on the threads. Gently start the plug in using just the extension, tighten firmly by hand. You'll then put a ratchet on the extension and tighten to 15 ft lbs- you likely won't be able to get a torque wrench in there, so tighten carefully -15 ft lbs is not that much.
    Attached Thumbnails Attached Thumbnails spsocketwplug.jpg  
    Last edited by Big Sky WRX; 12-20-2003 at 03:27 PM.

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    Next the coil packs go back on. Slide the boot portion over the spark plug, gently snugging it on- you'll feel it going on. Once properly on, tighen the coil pack bolt to 12 ft lbs- again a torque wrench won't likley fit so go careful- 12 ft lbs is not that much. Next reconnect the connectors to the coil packs.

    We're ready to move to the other side:

    First remove the air scoop, two 10mm bolts:
    Attached Thumbnails Attached Thumbnails airscoop.jpg  

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    Next we'll remove the airbox. We'll disconnect the hose connecting the airbox to the turbo inlet hose. Then we'll disconnect the connector to the MAF sensor (see pic). Then we'll remove the upper half of the air filter w/ the filter.
    Attached Thumbnails Attached Thumbnails airbox.jpg  

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    Next we'll remove the lower portion of the air box, two 12mm bolts- one shown in pic, the other on the other side:
    Attached Thumbnails Attached Thumbnails airboxlower.jpg  

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