Misfire 4k after new plugs 29D1 code

chesney72 · 10-29-2011, 09:36 AM

This was driving me nuts. Had a misfire at low revs and had thought it had to be an injector or coil as I had just fitted new OEM plugs about 4k miles ago.

Took a while but eventually got a 29D1 cylinder 5 misfire code and out of curiousity I swapped the plug for one of the old ones that was still kicking about my toolkit. Wow its like a new car again.

Driven it for a week now to make sure it was that before ordering a new plug. The idle is now rock solid and the little hesitations and stutters below 2000rpm have gone!

Never heard of a plug failing that quickly and hope it was just a dodgy plug and a one off.

Worth trying for any of you with similar issue.

tofu- · 10-29-2011, 10:08 AM

Why is cylinder 5 so popular with misfires? I'm having a problem too, but at WOT high rpm

JamesM3M5 · 10-29-2011, 10:10 AM

Interesting. You can never rule out a brand new part being flaky or bad. Good find.

nitehawk · 10-29-2011, 02:39 PM

I just received my new set of plugs - I was getting misfires at high RPMS in cylinder 6 after upgrading to Cobb S2+ on original plugs

Inspect your plugs before installing them. One of the six plugs I got definitely has a bad gap...

nitehawk · 10-29-2011, 02:44 PM

Should look like this...

MilehighM3 · 10-29-2011, 03:18 PM

Judging by the mark on the bad gap picture I'd say that plug got dropped or was damaged during installation...

nitehawk · 10-29-2011, 04:55 PM

Quote:

Originally Posted by Bmw135er

Judging by the mark on the bad gap picture I'd say that plug got dropped or was damaged during installation...

I actually received it like that. However, the box was open for that particular plug...possibly damaged during shipment

335TWNTURBO · 11-12-2011, 12:44 PM

i changed my plugs today and it resolved my misfire issues. thank goodness.

nitehawk · 12-04-2011, 02:31 PM

I finally had a chance to install my new plugs. Misfires are gone; car runs like a champ again. Feels great to bury my foot down again on S2+

Here are the original plugs after 35k miles

RoundelM3 · 12-04-2011, 02:46 PM

I'm about to upgrade to Dinan S3 and have 34K miles on my 07 E92...no misfiring so far, but looks like I might be about ready for a plug change too. Even with the relatively low miles, they're over 5 years old now. Probably wouldn't hurt.

JamesM3M5 · 12-04-2011, 02:56 PM

Quote:

Originally Posted by roundel335

I'm about to upgrade to Dinan S3 and have 34K miles on my 07 E92...no misfiring so far, but looks like I might be about ready for a plug change too. Even with the relatively low miles, they're over 5 years old now. Probably wouldn't hurt.

Cheap insurance, much better to do them pre-emptively than to install S3 and have problems with 35k mile old plugs. Tuned N54s should get plugs every 20-25k at least.

Jeff@TopGearSolutions · 12-04-2011, 03:41 PM

Quote:

Originally Posted by JamesM3M5

Cheap insurance, much better to do them pre-emptively than to install S3 and have problems with 35k mile old plugs. Tuned N54s should get plugs every 20-25k at least.

BrianMN · 12-04-2011, 04:54 PM

You always have to double-check the gaps on the plugs before installing them; and I even gap them down by .004 as well to help them last a little bit longer.

Regarding replacing the plugs as a pre-requisite for new tune/more power; I have recently made it compulsory for customers to have new spark plugs instlalled at the same time as I install the tune.

I've done 3 tune installs in the past few months which where the customer came back within a week with misfires. 2 of the 3 cars only had 20k miles and one with 30k. Even though its completely understandable and an easy fix; it's best to just do it at the same time as the tune or increasing power just to rule out the possibility of misfires due to poor plugs.

RoundelM3 · 12-04-2011, 07:21 PM

OK. I'm convinced - I'll probably see if my installer can do the plugs when he does the oil cooler. I'd tackle that one myself if I had the correct socket and the time, but it's worth it to me to let someone who does it for a living and has years of experience do it right. Thanks for the insights!

TxBeem · 12-09-2011, 12:25 PM

Does it matter if you get plugs from BMW or sites like this :

http://www.4wheelsautoparts.com/bmw-...e2-p-2916.html

It's a Bosch ZGR6STE2 whether it's from here or at dealership, no? And price is 1/2 of dealer's.

nitehawk · 12-09-2011, 12:41 PM

Quote:

Originally Posted by TxBeem

Does it matter if you get plugs from BMW or sites like this :

http://www.4wheelsautoparts.com/bmw-...e2-p-2916.html

It's a Bosch ZGR6STE2 whether it's from here or at dealership, no? And price is 1/2 of dealer's.

^ Nope; that's what I used. It's essentially the same thing without the OEM labeling.

bryce · 12-09-2011, 12:58 PM

oem bosch ignition coils can be had for cheap, too. oem bmw packaging costs substantially more

boostaholic786 · 12-09-2011, 02:03 PM

I would stick to factory plugs

bulldog_yyc · 12-10-2011, 08:51 AM

Quote:

Originally Posted by bryce

oem bosch ignition coils can be had for cheap, too. oem bmw packaging costs substantially more

source?

Zeph · 12-10-2011, 08:57 AM

I bought the spark plug socket from my dealer, was like $50 with the CCA discount. Plugs I believe are around $20. I plan to replace all 6 on Monday, running stock tune all weekend to see if I can replicate the misfire/s but it just won't happen at 8.5 psi lol. I do have the new Continental HPFP, plus all 6 new part number injectors (under warranty). My LPFP was replaced at like 2k miles along with the sensor at some point. They tested the coils, no problems.

Zeph

10-29-2011, 09:36 AM	#1
chesney72 First Lieutenant 23 Rep 386 Posts Drives: JB4 G5 335i Sport Touring Join Date: Oct 2010 Location: Scotland iTrader: (1)	Misfire 4k after new plugs 29D1 code - Sorted This was driving me nuts. Had a misfire at low revs and had thought it had to be an injector or coil as I had just fitted new OEM plugs about 4k miles ago. Took a while but eventually got a 29D1 cylinder 5 misfire code and out of curiousity I swapped the plug for one of the old ones that was still kicking about my toolkit. Wow its like a new car again. Driven it for a week now to make sure it was that before ordering a new plug. The idle is now rock solid and the little hesitations and stutters below 2000rpm have gone! Never heard of a plug failing that quickly and hope it was just a dodgy plug and a one off. Worth trying for any of you with similar issue.
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10-29-2011, 10:08 AM	#2
tofu- Banned 87 Rep 2,854 Posts Drives: 335i Jet Black/Coral Red Join Date: Mar 2010 Location: nyc iTrader: (4)	Why is cylinder 5 so popular with misfires? I'm having a problem too, but at WOT high rpm
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10-29-2011, 10:10 AM	#3
JamesM3M5 Some dude 92 Rep 1,780 Posts Drives: E92 335i Join Date: Sep 2011 Location: Northern VA iTrader: (0)	Interesting. You can never rule out a brand new part being flaky or bad. Good find. __________________ RRT E92 335i/6MT with stuff and things
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10-29-2011, 02:39 PM	#4
nitehawk Lieutenant Colonel 102 Rep 1,903 Posts Drives: e92 335i 6MT Join Date: May 2011 Location: Toronto iTrader: (15) Garage List E92 BMW 335i [9.00] E92 BMW 335i \| Retired [10.00]	Inspect Your Plugs B4 Installing I just received my new set of plugs - I was getting misfires at high RPMS in cylinder 6 after upgrading to Cobb S2+ on original plugs Inspect your plugs before installing them. One of the six plugs I got definitely has a bad gap...
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10-29-2011, 02:44 PM	#5
nitehawk Lieutenant Colonel 102 Rep 1,903 Posts Drives: e92 335i 6MT Join Date: May 2011 Location: Toronto iTrader: (15) Garage List E92 BMW 335i [9.00] E92 BMW 335i \| Retired [10.00]	Should look like this...
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10-29-2011, 03:18 PM	#6
MilehighM3 Brigadier General 915 Rep 3,456 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	Judging by the mark on the bad gap picture I'd say that plug got dropped or was damaged during installation...
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11-12-2011, 12:44 PM	#8
335TWNTURBO Captain 54 Rep 740 Posts Drives: 07 335i Join Date: Jul 2009 Location: MARYLAND iTrader: (0)	i changed my plugs today and it resolved my misfire issues. thank goodness.
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12-04-2011, 02:31 PM	#9
nitehawk Lieutenant Colonel 102 Rep 1,903 Posts Drives: e92 335i 6MT Join Date: May 2011 Location: Toronto iTrader: (15) Garage List E92 BMW 335i [9.00] E92 BMW 335i \| Retired [10.00]	I finally had a chance to install my new plugs. Misfires are gone; car runs like a champ again. Feels great to bury my foot down again on S2+ Here are the original plugs after 35k miles Attached Images
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12-04-2011, 02:46 PM	#10
RoundelM3 Major General 1837 Rep 6,990 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Clayton, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	I'm about to upgrade to Dinan S3 and have 34K miles on my 07 E92...no misfiring so far, but looks like I might be about ready for a plug change too. Even with the relatively low miles, they're over 5 years old now. Probably wouldn't hurt. __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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12-04-2011, 04:54 PM	#13
BrianMN Banned 114 Rep 2,428 Posts Drives: 4 Door Family Sedan Join Date: Sep 2009 Location: Minneapolis iTrader: (7)	You always have to double-check the gaps on the plugs before installing them; and I even gap them down by .004 as well to help them last a little bit longer. Regarding replacing the plugs as a pre-requisite for new tune/more power; I have recently made it compulsory for customers to have new spark plugs instlalled at the same time as I install the tune. I've done 3 tune installs in the past few months which where the customer came back within a week with misfires. 2 of the 3 cars only had 20k miles and one with 30k. Even though its completely understandable and an easy fix; it's best to just do it at the same time as the tune or increasing power just to rule out the possibility of misfires due to poor plugs.
	Appreciate 0 Quote

12-04-2011, 07:21 PM	#14
RoundelM3 Major General 1837 Rep 6,990 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Clayton, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	OK. I'm convinced - I'll probably see if my installer can do the plugs when he does the oil cooler. I'd tackle that one myself if I had the correct socket and the time, but it's worth it to me to let someone who does it for a living and has years of experience do it right. Thanks for the insights! __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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12-09-2011, 12:25 PM	#15
TxBeem Captain 93 Rep 651 Posts Drives: 2008 E90 Join Date: Jul 2010 Location: Dallas iTrader: (6)	Does it matter if you get plugs from BMW or sites like this : http://www.4wheelsautoparts.com/bmw-...e2-p-2916.html It's a Bosch ZGR6STE2 whether it's from here or at dealership, no? And price is 1/2 of dealer's.
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12-09-2011, 12:58 PM	#17
bryce Banned 103 Rep 3,177 Posts Drives: zhp 3-pedal Join Date: May 2010 Location: texas iTrader: (22) Garage List 2005 bmw 330ci zhp [7.34] 2008 bmw 135i- sold [6.00] 2007 bmw 335i- sold [7.14]	oem bosch ignition coils can be had for cheap, too. oem bmw packaging costs substantially more
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12-09-2011, 02:03 PM	#18
boostaholic786 Captain 40 Rep 623 Posts Drives: E92 N54 with MHD Custom flash Join Date: Dec 2011 Location: Plano TX iTrader: (0)	I would stick to factory plugs
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12-10-2011, 08:57 AM	#20
Zeph Major 27 Rep 1,410 Posts Drives: 2008 E92 335i 6MT SGM CR/BD Join Date: Jul 2008 Location: Southeast USA iTrader: (0)	I bought the spark plug socket from my dealer, was like $50 with the CCA discount. Plugs I believe are around $20. I plan to replace all 6 on Monday, running stock tune all weekend to see if I can replicate the misfire/s but it just won't happen at 8.5 psi lol. I do have the new Continental HPFP, plus all 6 new part number injectors (under warranty). My LPFP was replaced at like 2k miles along with the sensor at some point. They tested the coils, no problems. Zeph
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