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      02-14-2020, 11:40 PM   #1
HLJustin
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340i Spark Plugs (45,860mi)

Just changed out stock spark plugs for NGK 94201 and gapped to .022 for tune. Super easy to do and I took my time.

Car History:
Stock: 3500mi
MPPSK: 3500-18,000mi
MP Stage 2: 18k-now

First time changing sparks so no idea what's a good or bad spark, but thought I'd put a picture up for you all to let me know. Checked all stock plugs were gapped to .030 with 5th one about .031 not sure how others found wild range of gaps in their stock plugs.

Left to right is 1-6 going front to back. Single picture is of 3 that looked "darker" compared to rest. What you all think? Didn't need to change? Clean sparks? Or somethings wrong?
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      02-15-2020, 09:39 AM   #2
Ahanix
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Quote:
Originally Posted by HLJustin View Post
Just changed out stock spark plugs for NGK 94201 and gapped to .022 for tune. Super easy to do and I took my time.

Car History:
Stock: 3500mi
MPPSK: 3500-18,000mi
MP Stage 2: 18k-now

First time changing sparks so no idea what's a good or bad spark, but thought I'd put a picture up for you all to let me know. Checked all stock plugs were gapped to .030 with 5th one about .031 not sure how others found wild range of gaps in their stock plugs.

Left to right is 1-6 going front to back. Single picture is of 3 that looked "darker" compared to rest. What you all think? Didn't need to change? Clean sparks? Or somethings wrong?

Spark plugs overall look fine, the tip doesn't look as worn down and the fact that they measured at .30/.31 is within factory tolerance, but a lot of the factory plugs are also arriving at .28 so they could also have some wear to them which is expected. Since you were regapping anyways it should have definitely helped a bit that you changed them out.


How's .022 running for you?
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      02-15-2020, 02:31 PM   #3
jbb2388
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Which tune?
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2016 340i X / MP STG 3 DME / STG 2 TRANS / NGK 94201 @ .023 / NO BOLT ONS
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      02-15-2020, 03:11 PM   #4
HLJustin
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Quote:
Originally Posted by Ahanix View Post
Quote:
Originally Posted by HLJustin View Post
Just changed out stock spark plugs for NGK 94201 and gapped to .022 for tune. Super easy to do and I took my time.

Car History:
Stock: 3500mi
MPPSK: 3500-18,000mi
MP Stage 2: 18k-now

First time changing sparks so no idea what's a good or bad spark, but thought I'd put a picture up for you all to let me know. Checked all stock plugs were gapped to .030 with 5th one about .031 not sure how others found wild range of gaps in their stock plugs.

Left to right is 1-6 going front to back. Single picture is of 3 that looked "darker" compared to rest. What you all think? Didn't need to change? Clean sparks? Or somethings wrong?

Spark plugs overall look fine, the tip doesn't look as worn down and the fact that they measured at .30/.31 is within factory tolerance, but a lot of the factory plugs are also arriving at .28 so they could also have some wear to them which is expected. Since you were regapping anyways it should have definitely helped a bit that you changed them out.


How's .022 running for you?
So far so good, just finished last night so outside of a few small pulls, wasn't able to really test out high rev range.
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      02-15-2020, 03:12 PM   #5
HLJustin
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Originally Posted by jbb2388 View Post
Which tune?
I've been running Mission Performance since about 18,000mi
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      02-16-2020, 11:42 AM   #6
B58togo
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Surprised you weren't misfiring way before 45K on original plugs.
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11.8 @ 118 mph/11.9 @ 119 mph
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      02-16-2020, 01:33 PM   #7
jbb2388
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Quote:
Originally Posted by HLJustin View Post
I've been running Mission Performance since about 18,000mi


What stage?
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      02-16-2020, 02:55 PM   #8
HLJustin
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Quote:
Originally Posted by jbb2388 View Post
Quote:
Originally Posted by HLJustin View Post
I've been running Mission Performance since about 18,000mi


What stage?
Stage 2

Quote:
Originally Posted by B58togo View Post
Surprised you weren't misfiring way before 45K on original plugs.
I honestly might have been. Still new to all of this and getting to know my car better. Car did have a real rough idle occasionally and had a few times last few months where power and rpm stumbles for half a second at lower speeds. Never had a CEL tho, I'd assume a misfire would trigger CEL? Or only after it's a constant issue?
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      02-16-2020, 07:18 PM   #9
B58togo
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Those were probably misfires. I started getting them around 26k on JB4. Changed them soon after and again at 44k. Probably do them again around 62k and replace coils too.
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2017 M240i AW/ ZF8/ Bootmod3 Stage 2 E30/ xHP Stage 3 trans/ ER catless DP/ Remus axle back/ BMS intake/ M Performance LSD

11.8 @ 118 mph/11.9 @ 119 mph
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