N20 Random Misfire and Cylinder 2&3

slow.f32 · 02-12-2018, 02:39 PM

So last Friday, I started my car during my lunch break, drove down the street and the check engine light came on. I haven't felt any symptoms yet but not sure since I haven't drove it much since then. I went to Autozone and used the scanner:

Error codes:
P0300 Random Misfire detected
P0303 Cylinder 3 Misfire detected
P0302 Cylinder 2 Misfire detected

Autozone printed out the results as well as a solution, which is to replace ignition coils and spark plugs. I ordered the kit that includes delphi ignition coils and spark plugs and plan on replacing this Friday.

I get regular maintenance at BMW with my upgrade maintenance plan whenever the maintenance light comes on. They said that spark plugs are included in the plan. When I asked why spark plugs were never replaced if they were included they stated spark plugs aren't due until 100k miles. Currently almost at 62k. They quoted me $175 just to diagnose the misfire. My engine is stock and I don't have any coding done.

Besides replacing the ignition coils and spark plugs, anyone else have any recommendations? Really hoping when I replace the parts this weekend and reset the cel that the problem is fixed.

BunkerJ · 02-12-2018, 03:08 PM

Quote:

Originally Posted by Slow_F32

So last Friday, I started my car during my lunch break, drove down the street and the check engine light came on. I haven't felt any symptoms yet but not sure since I haven't drove it much since then. I went to Autozone and used the scanner:

Error codes:
P0300 Random Misfire detected
P0303 Cylinder 3 Misfire detected
P0302 Cylinder 2 Misfire detected

Autozone printed out the results as well as a solution, which is to replace ignition coils and spark plugs. I ordered the kit that includes delphi ignition coils and spark plugs and plan on replacing this Friday.

I get regular maintenance at BMW with my upgrade maintenance plan whenever the maintenance light comes on. They said that spark plugs are included in the plan. When I asked why spark plugs were never replaced if they were included they stated spark plugs aren't due until 100k miles. Currently almost at 62k. They quoted me $175 just to diagnose the misfire. My engine is stock and I don't have any coding done.

Besides replacing the ignition coils and spark plugs, anyone else have any recommendations? Really hoping when I replace the parts this weekend and reset the cel that the problem is fixed.

Strange... I wonder if 100k is normal for them... Mine got replaced at 30k and then I replaced them with NGK iridium plugs at about 77k..

Just install those and you should be fine. Report back if it doesn't fix it.

M2_MEDUSA · 02-12-2018, 04:32 PM

Quote:

Originally Posted by BunkerJ

Quote:

Originally Posted by Slow_F32

So last Friday, I started my car during my lunch break, drove down the street and the check engine light came on. I haven't felt any symptoms yet but not sure since I haven't drove it much since then. I went to Autozone and used the scanner:

Error codes:
P0300 Random Misfire detected
P0303 Cylinder 3 Misfire detected
P0302 Cylinder 2 Misfire detected

Autozone printed out the results as well as a solution, which is to replace ignition coils and spark plugs. I ordered the kit that includes delphi ignition coils and spark plugs and plan on replacing this Friday.

I get regular maintenance at BMW with my upgrade maintenance plan whenever the maintenance light comes on. They said that spark plugs are included in the plan. When I asked why spark plugs were never replaced if they were included they stated spark plugs aren't due until 100k miles. Currently almost at 62k. They quoted me $175 just to diagnose the misfire. My engine is stock and I don't have any coding done.

Besides replacing the ignition coils and spark plugs, anyone else have any recommendations? Really hoping when I replace the parts this weekend and reset the cel that the problem is fixed.

Strange... I wonder if 100k is normal for them... Mine got replaced at 30k and then I replaced them with NGK iridium plugs at about 77k..

Just install those and you should be fine. Report back if it doesn't fix it.

I second Bunkers reply.

Replace your plugs and maybe coils but get NGK plugs and you should be fine. Normal issue

slow.f32 · 02-12-2018, 04:52 PM

Thanks, I will keep you guys updated!

slow.f32 · 02-19-2018, 10:39 AM

Switched out the ignition coils and spark plugs over the weekend that that fixed the CEL!

BunkerJ · 02-20-2018, 09:02 AM

Quote:

Originally Posted by Slow_F32

Switched out the ignition coils and spark plugs over the weekend that that fixed the CEL!

That's good to hear! What plugs did you get? Same ones as before? I only ask because if you are planning to start modding and upping the boost, you will need a step or two colder plugs.

slow.f32 · 02-20-2018, 10:12 AM

Quote:

Originally Posted by BunkerJ

That's good to hear! What plugs did you get? Same ones as before? I only ask because if you are planning to start modding and upping the boost, you will need a step or two colder plugs.

BMW-12120039664

Fr3sh · 02-20-2018, 10:49 AM

I got the same plugs, slow_f32 what mods are you running? Will you be upgrading to higher plugs? Or use the oem ?

BunkerJ · 02-20-2018, 12:42 PM

Okay, cool. It appears those plugs are LI plugs. http://www.rmeuropean.com/Products/1...64-MFG220.aspx

This part number lines up with the manufacturing number listed here: https://www.ngk.com/product.aspx?zpid=40569

When you get them, check that SILZKBR8D8S appears on the plug itself.

M2_MEDUSA · 02-21-2018, 12:25 AM

Awesome man, glad we could point you in the right direction (:

thisismikeyb · 02-21-2018, 04:27 AM

Quote:

Originally Posted by Slow_F32

Switched out the ignition coils and spark plugs over the weekend that that fixed the CEL!

Just curious what your plugs looked like? I replaced mine a few weeks ago at 67k miles and they looked good for the milage.

BunkerJ · 02-21-2018, 08:51 AM

Quote:

Originally Posted by thisismikeyb

Just curious what your plugs looked like? I replaced mine a few weeks ago at 67k miles and they looked good for the milage.

I replaced mine at about 78k miles, so they had just over 50k on them. Not as fouled, but similar. They honestly would've kept going, but I needed colder plugs and replaced them.

brandmaster · 03-13-2018, 12:51 AM

Is this part number for the 1 step colder plugs?

SILZKBR8D8S

Or are are these the OEM replacement ones?

M2_MEDUSA · 03-13-2018, 02:31 AM

I replaced mine at 40k and will continue to replace them every 30k miles because I beat my shit up

Domotron · 03-13-2018, 11:26 AM

Quote:

Originally Posted by Slow_F32

So last Friday, I started my car during my lunch break, drove down the street and the check engine light came on. I haven't felt any symptoms yet but not sure since I haven't drove it much since then. I went to Autozone and used the scanner:

Error codes:
P0300 Random Misfire detected
P0303 Cylinder 3 Misfire detected
P0302 Cylinder 2 Misfire detected

Autozone printed out the results as well as a solution, which is to replace ignition coils and spark plugs. I ordered the kit that includes delphi ignition coils and spark plugs and plan on replacing this Friday.

I get regular maintenance at BMW with my upgrade maintenance plan whenever the maintenance light comes on. They said that spark plugs are included in the plan. When I asked why spark plugs were never replaced if they were included they stated spark plugs aren't due until 100k miles. Currently almost at 62k. They quoted me $175 just to diagnose the misfire. My engine is stock and I don't have any coding done.

Besides replacing the ignition coils and spark plugs, anyone else have any recommendations? Really hoping when I replace the parts this weekend and reset the cel that the problem is fixed.

spark plugs were change on my car at 38k miles and i think coils need to be replaced around 70k -80k miles

BunkerJ · 03-13-2018, 11:36 AM

Quote:

Originally Posted by Domotron

spark plugs were change on my car at 38k miles and i think coils need to be replaced around 70k -80k miles

My coils are at 85k. Still kickin'! lol

ChubbyWilly · 03-13-2018, 11:49 AM

Quote:

Originally Posted by BunkerJ

My coils are at 85k. Still kickin'! lol

Jinx! My coils are starting to give out at 90k. I get hesitation under WOT and no CEL. Replaced the spark plugs and re-gapped to .020 on Saturday morning, misfires started on Thursday or Friday. Hoping it really is the coils and not the injectors.

Domotron · 03-14-2018, 07:32 AM

Quote:

Originally Posted by BunkerJ

My coils are at 85k. Still kickin'! lol

question for you .. since you around 85k miles now what maintenance did you have to do on the drivetrain ? i just hit 50k miles and wanting to replace front and rear diff fluids but i was told at bmw that trans dont need to be serviced ...

BunkerJ · 03-14-2018, 08:56 AM

Quote:

Originally Posted by Domotron

question for you .. since you around 85k miles now what maintenance did you have to do on the drivetrain ? i just hit 50k miles and wanting to replace front and rear diff fluids but i was told at bmw that trans dont need to be serviced ...

I haven't done any actually. I thought about a tranny drain/fill, but the shop I go to (Run by two BMW master techs) hasn't told me I needed one yet, so here I am!

Domotron · 03-14-2018, 09:02 AM

Quote:

Originally Posted by BunkerJ

I haven't done any actually. I thought about a tranny drain/fill, but the shop I go to (Run by two BMW master techs) hasn't told me I needed one yet, so here I am!

man that kind worries me lol it must have that magical BMW fluid

BunkerJ · 03-14-2018, 09:32 AM

Quote:

Originally Posted by Domotron

man that kind worries me lol it must have that magical BMW fluid

It's possible. They wouldn't let me go without something I need, so I trust them.

Domotron · 03-14-2018, 09:35 AM

Quote:

Originally Posted by BunkerJ

It's possible. They wouldn't let me go without something I need, so I trust them.

shit i guess well see lol don't really want to have any drive-train issues since ill be starting on my motor build this summer

02-12-2018, 02:39 PM	#1
slow.f32 New Member 6 Rep 28 Posts Drives: Alpine White F32 M Sport Join Date: Sep 2017 Location: N. California iTrader: (0)	N20 Random Misfire and Cylinder 2&3 So last Friday, I started my car during my lunch break, drove down the street and the check engine light came on. I haven't felt any symptoms yet but not sure since I haven't drove it much since then. I went to Autozone and used the scanner: Error codes: P0300 Random Misfire detected P0303 Cylinder 3 Misfire detected P0302 Cylinder 2 Misfire detected Autozone printed out the results as well as a solution, which is to replace ignition coils and spark plugs. I ordered the kit that includes delphi ignition coils and spark plugs and plan on replacing this Friday. I get regular maintenance at BMW with my upgrade maintenance plan whenever the maintenance light comes on. They said that spark plugs are included in the plan. When I asked why spark plugs were never replaced if they were included they stated spark plugs aren't due until 100k miles. Currently almost at 62k. They quoted me $175 just to diagnose the misfire. My engine is stock and I don't have any coding done. Besides replacing the ignition coils and spark plugs, anyone else have any recommendations? Really hoping when I replace the parts this weekend and reset the cel that the problem is fixed.
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02-12-2018, 04:52 PM	#4
slow.f32 New Member 6 Rep 28 Posts Drives: Alpine White F32 M Sport Join Date: Sep 2017 Location: N. California iTrader: (0)	Thanks, I will keep you guys updated!
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02-19-2018, 10:39 AM	#5
slow.f32 New Member 6 Rep 28 Posts Drives: Alpine White F32 M Sport Join Date: Sep 2017 Location: N. California iTrader: (0)	Switched out the ignition coils and spark plugs over the weekend that that fixed the CEL!
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02-20-2018, 10:49 AM	#8
Fr3sh #im_2_Fr3sh 30 Rep 247 Posts Drives: Bmw 428i xdrive Join Date: Jan 2018 Location: Ny iTrader: (0)	I got the same plugs, slow_f32 what mods are you running? Will you be upgrading to higher plugs? Or use the oem ?
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02-20-2018, 12:42 PM	#9
BunkerJ Colonel 1032 Rep 2,382 Posts Drives: 2013 328i Join Date: Mar 2017 Location: San Diego, CA iTrader: (0)	Okay, cool. It appears those plugs are LI plugs. http://www.rmeuropean.com/Products/1...64-MFG220.aspx This part number lines up with the manufacturing number listed here: https://www.ngk.com/product.aspx?zpid=40569 When you get them, check that SILZKBR8D8S appears on the plug itself. __________________ 2013 F30 328i: MHI Big Turbo, GFB DV+, Mishimoto CAI, ER TIC/CP/Catless DP, AWE Touring Quad Exhaust w/ Resonated Midpipe, NGK LI Plugs, BM3 with PTF Stage 2 91 AGG Tune, Fuel-it Stage 2 LPFP, Solowerks S1 Coilovers, and DEPO/M-Sport Retrofit
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02-21-2018, 12:25 AM	#10
M2_MEDUSA Major 664 Rep 1,074 Posts Drives: 2021 M2 Comp. SpecialEdition Join Date: Sep 2017 Location: Texas iTrader: (0)	Awesome man, glad we could point you in the right direction (: __________________ Instagram: M2_Medusa
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03-13-2018, 12:51 AM	#13
brandmaster New Member 4 Rep 26 Posts Drives: 2016 328i Join Date: Nov 2017 Location: US iTrader: (0)	Is this part number for the 1 step colder plugs? SILZKBR8D8S Or are are these the OEM replacement ones?
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03-13-2018, 02:31 AM	#14
M2_MEDUSA Major 664 Rep 1,074 Posts Drives: 2021 M2 Comp. SpecialEdition Join Date: Sep 2017 Location: Texas iTrader: (0)	I replaced mine at 40k and will continue to replace them every 30k miles because I beat my shit up __________________ Instagram: M2_Medusa
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