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Thread: DIY/How To: changing Spark Plugs on a K13 (Micra/March)

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    Senior Member Nobuseri's Avatar
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    DIY/How To: changing Spark Plugs on a K13 (Micra/March)

    So it seems there's a lot of miss-conception about changing spark plugs on the HR16DE, I decided to get DIY and show a bit of the truth behind getting this done. It is not necessarily for everyone but should save a couple of hundred dollars from the dealer.

    Since my car now is coming close to 128k it is well overdue for a tune-up and changing the spark plugs is a about a whole day's worth of work.

    There's a few things required tho, first of all, a special 14mm thin walled socket that can fit inside the spark plug bore without interference and with a rubber holder on the inside. This is where the special tool is required, Snap-On sells it (part# S9714MK) it's not a cheap socket selling for about 50$. The savings come from doing the job yourself.
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    The rest of the tools required are basic set of 3/8 extensions and ratchets. 10mm sockets.

    First miss-conception is that the owner requires to buy a brand new set of intake plenum gaskets, that is not true, they are re-usable in design and simply need to be cleaned.

    So I went ahead and took apart the intake filter out.


    I continued to disassemble the rest of the plenum assembly, there is a total 7 10mm bolts holding itself down to the cam cover.


    At this point to remove the plenum I had to remove the entire front bumper, because the hood latch assembly wouldn't permit it's removal due to interference, this got quite labour intensive.


    Moving forward, I removed the throttle body too, 4x 8mm bolts hold it down. Removing the engine coolant hoses are tricky but a must.
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    Take note, to get clearance to remove the plenum, I also had to remove the intake solenoid it's held down by a small 8mm screw. Some oil may drip.

    Second miss-conception, OEM plugs being Iridium, well mine weren't, they were Platinum tip models. Part# starts with PL = Platinum
    So talking spark plugs, the new ones I ordered for the the job are NGK Iridium IX, these are the top of the line models Part# LKAR6AIX-11, these have a stock heat rating of 6 (cold) 2-12 is the gauge from hot to cold plug. These cost from 12-15$ each

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    These plugs have fine iridium tip and platinum ark

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    Here's the plenum's re-usable gasket, it has tabs for easy removal, I suggest cleaning it before re-assembly.

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    There is also a re-usable O-ring gasket on the throttle body side.

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    So using the special socket to remove the old spark plugs, I found out the stock ones on my car were indeed Platinum types from NGK. It seems I was well overdue for changing them, here they are lined up from cylinder #1 to 4

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    It seems cylinder #3 was running rich due to it's darker color, something to investigate. When doing a tune-up this is the best way to see the condition of the internals of the engine and this is big preventive maintenance many skip over. This gave me a huge report on what is going on with my engine.

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    So I went ahead and changed all the spark plugs and I also swapped my used coil packs to some new ones I had lying around from the scrap.

    At this point re-assembly was in order, I had an extra plenum so I decided it was a good time to swap it for this wrinkle finished model I made a few days prior.

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    I think the result looks quite professional, take note I also equipped it with a newer T/B all cleaned up for this tune up.

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    After doing it myself, it turned out not to be such a pain, but a lot of disassembly work before getting to the cam cover.
    Last edited by Nobuseri; 08-21-2018 at 10:14 AM.

  2. The Following 4 Users Say Thank You to Nobuseri For This Useful Post:

    Azmodon (08-20-2018),MetroMPG (08-21-2018),MrMicra2015 (08-26-2018),Vaszya (08-23-2020)

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