N54 misfire/hesitation between 2500 and 4500 rpm

911Mick · 12-31-2014, 07:19 PM

I have a 2008 N54 335i with about 75k miles. It recently developed a misfire/hesitation between 2500 and 4500rpm. It is an auto but the misfire is most prominent when I hold full throttle in a high gear. Above 4500rpm the engine runs fine all the time.

I had similar misfire issues about 5k miles ago and replaced the coils and plugs which fixed the issues. The car has a JB4 and the issue is there with the JB4 off but is less severe.

I don't get any fault codes.

Anyone have any ideas? Given the problem happens in the mid range, it seems like another electrical problem but given the coils and plus are fairly new, it seems unlikely?

The car idles like a clock and outside of the 2500-4500 rpm range, runs absolutely fine.

Ingeniator · 12-31-2014, 07:55 PM

Quote:

Originally Posted by 911Mick

I have a 2008 N54 335i with about 75k miles. It recently developed a misfire/hesitation between 2500 and 4500rpm. It is an auto but the misfire is most prominent when I hold full throttle in a high gear. Above 4500rpm the engine runs fine all the time.

I had similar misfire issues about 5k miles ago and replaced the coils and plugs which fixed the issues. The car has a JB4 and the issue is there with the JB4 off but is less severe.

I don't get any fault codes.

Anyone have any ideas? Given the problem happens in the mid range, it seems like another electrical problem but given the coils and plus are fairly new, it seems unlikely?

The car idles like a clock and outside of the 2500-4500 rpm range, runs absolutely fine.

Push it until it throws a code.

Official Misfire Thread

335NJ · 12-31-2014, 07:56 PM

Did the misfire go away after replacing the plugs/coils at all? Which type of plugs are you using?

I'd say try to get a log of it happening without going crazy risking damage or something. It could be fuel related too, which a log may help us see.

911Mick · 12-31-2014, 08:51 PM

Quote:

Originally Posted by 335NJ

Did the misfire go away after replacing the plugs/coils at all? Which type of plugs are you using?

I'd say try to get a log of it happening without going crazy risking damage or something. It could be fuel related too, which a log may help us see.

I haven't tried replacing plugs and could again because they are so new. It will not throw a code, no matter how long I push it for.

I have pulled the JB4 off to see if that was the issue. I will put it back on and try to take some logs.

The1ontop · 12-31-2014, 11:09 PM

Injectors would most likely be your culprit if you only have 5k miles on plugs and coils

The1ontop · 12-31-2014, 11:10 PM

No way around it lol I did mine at 70k took me about 1 hr for all 6 plus to code them

Fun w/N54 · 12-31-2014, 11:20 PM

Quote:

Originally Posted by 911Mick

I have a 2008 N54 335i with about 75k miles. It recently developed a misfire/hesitation between 2500 and 4500rpm. It is an auto but the misfire is most prominent when I hold full throttle in a high gear. Above 4500rpm the engine runs fine all the time.

I had similar misfire issues about 5k miles ago and replaced the coils and plugs which fixed the issues. The car has a JB4 and the issue is there with the JB4 off but is less severe.

I don't get any fault codes.

Anyone have any ideas? Given the problem happens in the mid range, it seems like another electrical problem but given the coils and plus are fairly new, it seems unlikely?

The car idles like a clock and outside of the 2500-4500 rpm range, runs absolutely fine.

If it hasn't been done then get the valves blasted. Also have you used a BT tool or Cobb to look for shadow codes. Not all codes will show with standard OBDII reader.

Good luck.

335NJ · 12-31-2014, 11:31 PM

Quote:

Originally Posted by 911Mick

I haven't tried replacing plugs and could again because they are so new. It will not throw a code, no matter how long I push it for.

I have pulled the JB4 off to see if that was the issue. I will put it back on and try to take some logs.

You're using the correct plug right?

911Mick · 01-01-2015, 03:56 AM

Quote:

Originally Posted by 335NJ

You're using the correct plug right?

The correct plug for what?

911Mick · 01-01-2015, 06:21 AM

Quote:

Originally Posted by 911Mick

The correct plug for what?

Oh…I'm a bit slow today, you mean the correct spark plug? Yeah, I am using the OE Bosch plugs

TemjinX2 · 07-05-2015, 06:02 PM

sorry to bring up a old thread. did this ever get resolved? i'm having similar issues.

911Mick · 07-07-2015, 09:20 AM

Yep - it was a bad coil

mike@x-ph.com · 07-07-2015, 11:55 AM

Quote:

Originally Posted by 911Mick

Yep - it was a bad coil

Glad that you got it figured out

12-31-2014, 07:19 PM	#1
911Mick New Member 1 Rep 5 Posts Drives: E90 335i Join Date: Dec 2014 Location: Sydney, Australia iTrader: (0)	N54 misfire/hesitation between 2500 and 4500 rpm I have a 2008 N54 335i with about 75k miles. It recently developed a misfire/hesitation between 2500 and 4500rpm. It is an auto but the misfire is most prominent when I hold full throttle in a high gear. Above 4500rpm the engine runs fine all the time. I had similar misfire issues about 5k miles ago and replaced the coils and plugs which fixed the issues. The car has a JB4 and the issue is there with the JB4 off but is less severe. I don't get any fault codes. Anyone have any ideas? Given the problem happens in the mid range, it seems like another electrical problem but given the coils and plus are fairly new, it seems unlikely? The car idles like a clock and outside of the 2500-4500 rpm range, runs absolutely fine.
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12-31-2014, 07:56 PM	#3
335NJ Colonel 535 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	Did the misfire go away after replacing the plugs/coils at all? Which type of plugs are you using? I'd say try to get a log of it happening without going crazy risking damage or something. It could be fuel related too, which a log may help us see. __________________ *BSM E90 6MT*-JB4 G5 ISO-BMS DCI-Golf-Tee Mod-Hankook S1N2 Non-RFT-ER Chargepipe/TiAL BOV-E40 blend-VRSF V2's-M3 CDV-MHD/JB4 FLASH-VRSF 5" STEPPED FMIC
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12-31-2014, 11:09 PM	#5
The1ontop Second Lieutenant 12 Rep 228 Posts Drives: 2007 335i E92 Join Date: Nov 2013 Location: Maryland iTrader: (0)	Injectors would most likely be your culprit if you only have 5k miles on plugs and coils
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12-31-2014, 11:10 PM	#6
The1ontop Second Lieutenant 12 Rep 228 Posts Drives: 2007 335i E92 Join Date: Nov 2013 Location: Maryland iTrader: (0)	No way around it lol I did mine at 70k took me about 1 hr for all 6 plus to code them
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07-05-2015, 06:02 PM	#11
TemjinX2 Major 529 Rep 1,493 Posts Drives: 2008 335xi e92 Join Date: Dec 2009 Location: Socal OC iTrader: (0)	sorry to bring up a old thread. did this ever get resolved? i'm having similar issues.
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07-07-2015, 09:20 AM	#12
911Mick New Member 1 Rep 5 Posts Drives: E90 335i Join Date: Dec 2014 Location: Sydney, Australia iTrader: (0)	Yep - it was a bad coil
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