[LeftField11]

I'm getting a persistent misfire in cylinder 3. New plugs, new coils; swapped new plugs and coils in cylinders 3 and 1; misfire stays in cylinder 3.

Time to replace injectors? Looks like my current ones are index 7.

126,000 miles, completely stock.

I've read through this thread, just praying I can find an answer.

[GEOS07335i]

Did you swap injector 3 into another cylinder to rule it out. I have an 08 and mine went right around the same milalage

[LeftField11]

Originally Posted by GEOS07335i

Did you swap injector 3 into another cylinder to rule it out. I have an 08 and mine went right around the same milalage

That's a good idea. I don't have a tool to pull the injectors right now, but I was planning on purchasing one anyhow if/when I replace the injectors.

Are there any concerns with swapping injectors without replacing the seal? Obviously I'd try to do it quickly.

[LeftField11]

Had a "Misfire Cylinder 3" code. Rough idle, rough acceleration.

- new plugs
- new coils
- cleaned intakes
- replaced VCG (not intended to fix the misfire but it needed to be done)
- new injectors

Put it back together and "Misfire Cylinder 3". What's next? Bank 1 pre-cat O2 sensor? I just ordered one. No idea what else it could be. Wiring harness?

[beetle6986]

Originally Posted by b92

I was in the same boat, i highly recommend switching to JB4+MHD backend, this will solve your timing issues

I haven't been online for a while. So you think it may be timing related? Maybe I should run some logs and see if anything interesting shows up under light load when the car seems to be misfiring. It looks like the MHD requires an android device.

[b92]

Originally Posted by beetle6986

I haven't been online for a while. So you think it may be timing related? Maybe I should run some logs and see if anything interesting shows up under light load when the car seems to be misfiring. It looks like the MHD requires an android device.

I was chasing misfires for months before I bought & installed an intercooler and flashed MHD. Misfires went away immediately and I fell in love with my car all over again.

MHD costs:
- Cheap Android Tablet - $70 (I got a refurbed Galaxy Tab from Walmart)
- DCAN cable: $25
- MHD BEF flasher: $79
- Total: $174

[=C=]

Originally Posted by Jeff@TopGearSolutions

Pull the spark plugs then and see if it's a leaky injector, the plug would be fouled with fuel. It could also be a leaking valve cover gasket. I know you said multiple misfires but it's worth the 20 minutes to pull the plugs and take a look and you may get lucky and find a quick answer.

A leaky valve cover gasket can cause misfires?

What about a poor connected vent hose? Top left on no # 9.

The square clips don't seem to hold the vent hose securely in place, and there is always a 1 -3 millimeters gap. I found my clips partially broken too.... Managed to secure it better with zip ties at the moment.

[Singleturbo335i]

so every time I go wot it either drops -3 on one cylinder, some or all please help! e92 FBO 66k miles! just got done putting it together, it's on mhd v7 stage 2 and v8 stage 2 on data logs. I know its the DME helping knock but whats causing it? when DME corrects its usually IAT, plugs, coils, too aggressive map or trash fuel. I know its not too aggressive map because come on its mhd not no custom map and it has brand new coils and plugs with less than 250miles on them and its not the fuel. i know my IAT's were hot but were the hot enough to pull timing and don't worry 7.5 inch will be here Friday!
LOGS: https://datazap.me/u/mason54/log-153...og=0&data=3-24
mods:
4 bar map sensor
• IGNITION COILS (6 OF THEM) ES: 2919787

• HIGH FLOW FUEL PUMP - 255LPH ES#: 2189784

• 2011 M3 LSD DIFFERENTIAL (3.15 RATIO)

• 2011 M3 HALF SHAFTS (LEFT AND RIGHT)

• 2011 M3 DRIVESHAFT

• MOTIV TWIN DISC CLUTCH ET - BMW N54 1300 TQ CAPACITY

• MOTIV THROW OUT BEARING

• MOTIV PILOT BEARING

• ECS PERFORMANCE CLUTCH FORK PIVOT PIN ES#: 2992391

•CLUTCH FORK LEVER ES#: 41235

• DUAL COLD AIR INTAKE

• BMW FUEL INJECTORS (SET OF 6 FOR N54-INDEX12) - GENUINE BMW #: 13538648937KT

• NGK 93026 DILKAR8A8 LASER IRIDIUM PLUGS 6 OF THEM #: NGK93026 GAP at .022

• HP AUTOSPORT MODIFIED CLUTCH DELAY VALVE

• ULTIMATE SHORT SHIFTIER EVO3 WHOLE SHIFTIER KIT #: USSE335+86-3

• VRSF CHARGEPIPE UPGRADE KIT

• BLOW OFF VALVE TURBOSMART KOMPACT PLUMB BLACK DIVERTER VALVE

• VRSF 3" CAST STAINLESS STEEL CATLESS DOWNPIPES V2 N54 CERAKOTE HIGH TEMP COATING

• TUNER MOTORSPORT SOLID ALUMINUM ENGINE AND TRANSMISSION MOUNT SET T#: 397211

• REAR DIFFERENTIAL MOUNTS - SOLID DELRIN RACE T#: 1453

[Mikez306]

As a new owner, I really found this helpful. Thanks for posting.


Mike

[dcorn]

Posting just to relay my misfire story (knock on wood):

Bought the car in August from my mom who has owned it since new, 63k miles on a 2008 335i. Car had a pretty serious misfire when getting in the higher RPMs and especially in boost. She didn't really notice/care, but had all the maintenance records. The plugs and coils were only 10k miles old, a couple injectors had been replaced, but not since like 2013. I did a couple full throttle pulls and got the car to throw a code, cyl 3 misfire.

1) Replaced the plugs and the cyl 3 coil. Car wouldn't even idle properly. Threw the stock coil back in and it ran fine. So it was either bad out of the box or I didn't seat it properly. So basically all the plugs were new Bosch replacements and the car ran much better. Still misfiring ever so slightly, but much better than before.

2) Replaced all the vacuum lines, no change.

3) Finally got the intake valves walnut blasted, this completely cured the misfire. The car runs perfectly smooth at full throttle all the way to redline. The pic of the intake didn't look too bad, but lots of gunk around the valves themselves. I was surprised that could make such a difference.

Now the car is getting driven daily on my 50 mile/day commute, so it'll get 15-20k a year on it instead of 5-6k. My mom did a ton of very short trips, so I'm betting putting more sustained highway miles on it will be better for the car in the long run.

[beetle6986]

Originally Posted by dcorn

Posting just to relay my misfire story (knock on wood):

Bought the car in August from my mom who has owned it since new, 63k miles on a 2008 335i. Car had a pretty serious misfire when getting in the higher RPMs and especially in boost. She didn't really notice/care, but had all the maintenance records. The plugs and coils were only 10k miles old, a couple injectors had been replaced, but not since like 2013. I did a couple full throttle pulls and got the car to throw a code, cyl 3 misfire.

1) Replaced the plugs and the cyl 3 coil. Car wouldn't even idle properly. Threw the stock coil back in and it ran fine. So it was either bad out of the box or I didn't seat it properly. So basically all the plugs were new Bosch replacements and the car ran much better. Still misfiring ever so slightly, but much better than before.

2) Replaced all the vacuum lines, no change.

3) Finally got the intake valves walnut blasted, this completely cured the misfire. The car runs perfectly smooth at full throttle all the way to redline. The pic of the intake didn't look too bad, but lots of gunk around the valves themselves. I was surprised that could make such a difference.

Now the car is getting driven daily on my 50 mile/day commute, so it'll get 15-20k a year on it instead of 5-6k. My mom did a ton of very short trips, so I'm betting putting more sustained highway miles on it will be better for the car in the long run.

My misfire has only gotten worse. Last week I checked cylinder compression. They were all very low but close in numbers. The cheap harbor freight tester I used reads low because of how it is designed. I just finished the walnut blasting last night and that didnt help either. Below is what I have done to date. Getting tired of BMWs. Dealing with this is a PIA and now I found out my 2013 X5 needs a new engine (uses a quart of oil every 600 miles). These cars just seem too unreliable.

exhaust vanos replaced
new oem plugs
new oem coils
walnut blasting
compression check
swapped injectors with old injectors I had from other cars. made no difference swapping out 2 at a time.

Next
intake vanos replacement
Remove JB4 tune?
Replace precat 02 sensors?
Swap more injectors around or just buy a set?

[beetle6986]

Originally Posted by beetle6986

My misfire has only gotten worse. Last week I checked cylinder compression. They were all very low but close in numbers. The cheap harbor freight tester I used reads low because of how it is designed. I just finished the walnut blasting last night and that didnt help either. Below is what I have done to date. Getting tired of BMWs. Dealing with this is a PIA and now I found out my 2013 X5 needs a new engine (uses a quart of oil every 600 miles). These cars just seem too unreliable.

exhaust vanos replaced
new oem plugs
new oem coils
walnut blasting
compression check
swapped injectors with old injectors I had from other cars. made no difference swapping out 2 at a time.

Next
intake vanos replacement
Remove JB4 tune?
Replace precat 02 sensors?
Swap more injectors around or just buy a set?

I replaced all of the injectors with index 12 injectors and the car still misfires! I guess I will remove the jb4 and see if that could be causing it. then do O2 sensors next. After that.... off to the junk yard and I'm done with BMW. I'll go back to american made.

[beetle6986]

Originally Posted by beetle6986

I replaced all of the injectors with index 12 injectors and the car still misfires! I guess I will remove the jb4 and see if that could be causing it. then do O2 sensors next. After that.... off to the junk yard and I'm done with BMW. I'll go back to american made.

Removed the JB4. That didn’t help. I guess I’ll do O2 sensors next.

[Ayedum]

cant wait to order my cobb

[type-dRew]

Originally Posted by Ayedum

cant wait to order my cobb

Don't do that.

[beetle6986]

Originally Posted by beetle6986

Removed the JB4. That didn’t help. I guess I’ll do O2 sensors next.

Replaced the O2 sensor in bank 1. Didn't help anything.

I'm starting to wonder if the car has a blown headgasket from overheating when the water pump went out the second time (almost a year ago). The car went into limp mode with reduced power. I drove it about another 5 miles on reduced power until I parked it as it wouldn't drive anymore under its own power due to the computer limiting. It was freezing outside when this happened. The next day I started the car and drove it home. It hardly started at first. Once it did start it smoked and misfired horribly for a few minutes. Turns out the water pump mechanics didn't fail. The housing actually cracked allowing all of the coolant to leak out. Possibly it had a minor gasket leak that has slowly gotten worse.

[beetle6986]

Originally Posted by beetle6986

Replaced the O2 sensor in bank 1. Didn't help anything.

I'm starting to wonder if the car has a blown headgasket from overheating when the water pump went out the second time (almost a year ago). The car went into limp mode with reduced power. I drove it about another 5 miles on reduced power until I parked it as it wouldn't drive anymore under its own power due to the computer limiting. It was freezing outside when this happened. The next day I started the car and drove it home. It hardly started at first. Once it did start it smoked and misfired horribly for a few minutes. Turns out the water pump mechanics didn't fail. The housing actually cracked allowing all of the coolant to leak out. Possibly it had a minor gasket leak that has slowly gotten worse.

Car passed blown head gasket test.

However, I think I had a break through today with some with something else. I pulled fuse 26 which disables the awd system. The car does not misfire with this fuse out. So I believe it isn’t actually a misfire. I think the issue is related to the transfer case or the 4x4 system. It just feels exactly like a misfire.

[kchalisuri]

hello guys, i have e60 xdrive. i wrote post on 5 series forum, but 3 series owners make more tune then 5 series. can someone help

this is my post
https://e60.5post.com/forums/showthr...0#post24594490

[avityvan]

2006 BMW 325i
N52 code: Misfire on cylinder 2

I was driving one day and all suddenly my car loss some power and start idling very bad so I scan the car and it give me a misfire on cylinder 2. Did some research on the forum and I thought maybe is time to replaced this all these things anyway so I took out the 2 solenoids and clean them and I replaced all coils and spark plugs and cylinder 2 injector but nothing change. I did a scan again and is still read misfire cylinder 2.

After everything that I did the car still have the same issues.

Help!!! much appreciated.

[mweisdorfer]

Originally Posted by avityvan

2006 BMW 325i
N52 code: Misfire on cylinder 2

I was driving one day and all suddenly my car loss some power and start idling very bad so I scan the car and it give me a misfire on cylinder 2. Did some research on the forum and I thought maybe is time to replaced this all these things anyway so I took out the 2 solenoids and clean them and I replaced all coils and spark plugs and cylinder 2 injector but nothing change. I did a scan again and is still read misfire cylinder 2.

After everything that I did the car still have the same issues.

Help!!! much appreciated.

What coils did you use? What sort of tune do you have on a 325? Injector might be the issue. From what I understand, you can only use 11 & 12 in the same bank..

So, if you had like 10 and below in the other 2, in the same bank, and put a new 12 in that would make sense. Also, most people would suggest Eldor coils when doing a tune.

[avityvan]

I replaced all 6 coils with BMW Direct Ignition Coil - Bosch 0221504465 and also replaced injector 2 but is still have cylinder 2 misfire. I don't know what else can it be.

I don't understand what you mean 11 & 12 in the same bank.

Thanks for the help, much appreciated.

[rjahl]

Jump over to the Naturally Aspirated forums. Much more help for the N52 over there.