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      11-02-2018, 09:20 AM   #1
gthanson
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Question B58 spark plug change

Hi everyone

I've own a 2016 340i xdrive that just reached 90,000km. The agreement I had with my dealership for free servicing apparently expired at 80,000km, a fact I discovered when they contacted me to inform me the car was due for about $1500 worth of "required maintenence". Needless to say I wasn't pleased, and decided out of spite to do all the work myself, even if I spent just as much doing it myself. I figured I'd learn something at least.

The oil change was easy, as was the brake fluid flush (there's a really good youtube video on that here: https://youtu.be/mbK6zB2yglM), the tire alignment I got done at a local shop, and I think the "AC/heating system refresh" is probably BS, or at least not critical to the vehicle operation.

What I am hung up on is the spark plug change. I don't know what's in there now, but all the research I've done online suggested I swap them out for these: https://www.autozone.com/ignition-tu...lug/941022_0_0. I've got a special thin-walled 14mm 12-point socket online, and I'm ready to go, but I just wanted to verify a couple things really quick before I move forward:
  • Reading up on spark plugs I keep coming across something called gap, which I think is the distance between the two terminals on the end of the plug? Do I need to set the gap on the new ones, or would they just be a straight swap out for the old ones?
  • What are the consequences of me screwing this up, gap or otherwise? Do I get an error message/check engine light, or does the engine blow up?
  • Any other advice? I've never attempted this in any vehicle before.
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      11-03-2018, 08:53 AM   #2
F32Fleet
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Buy Bosch/OE plugs. On these the gap is pre-set. Part no 12120040551


Buy a torque wrench and use a can of air to blow the wells clean prior to pulling the existing plugs. You'll also need the appropriate extension and wobble adapter to reach the back plug.
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