02-14-2020, 11:40 PM | #1 |
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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? |
02-15-2020, 09:39 AM | #2 | |
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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, 03:11 PM | #4 | ||
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02-16-2020, 11:42 AM | #6 |
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Surprised you weren't misfiring way before 45K on original plugs.
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2017 M240i/ ZF8 Pure Drivetrain Solutions Stage 1 & torque converter/xHP/ DAW Ultra Flow/ DS2/ Nostrum injectors/ E40 Doug Newton tuned/ ER DP/ Remus axle back/ BMS intake/ FTP CP/ M Perf LSD
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02-16-2020, 01:33 PM | #7 |
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What stage?
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2016 340i X / MP STG 3 DME / STG 1 TRANS / NGK 94201 @ .023 / NO BOLT ONS
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02-16-2020, 02:55 PM | #8 | |
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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 |
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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/ ZF8 Pure Drivetrain Solutions Stage 1 & torque converter/xHP/ DAW Ultra Flow/ DS2/ Nostrum injectors/ E40 Doug Newton tuned/ ER DP/ Remus axle back/ BMS intake/ FTP CP/ M Perf LSD
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