What does misfire sound like? - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

e82n54 · 08-06-2012, 09:36 AM

While at the track on Saturday I heard a strange noise and my instructor said it sounded like the engine was misfiring. The sound was like a low fluttering rumble. It only happened at wide open throttle at 5,000 rpm and above. I didn't notice reduced performance. There were no warning lights.

I had the N54 tuned to stage 1 aggressive (Cobb tuning) when this happened. I decided to remove the tune and see if it happened again. It didn't happen again after removing the tune.

I should have checked for thrown codes before detuning, but I forgot.

So, what does a misfire sound like? Thanks

addict135i · 08-06-2012, 11:05 AM

I had a similiar noise, it was a misfire! Get that checked out!

Dackelone · 08-06-2012, 11:13 AM

IF you really did have a misfire, your SES and ECL would have gone off. (unless your tune has auto clearing enabled!)...

Also... when your engine misfires... you will FEEL it! Our cars really shake when there is a misfire. It feels as if your driving on square tires or you ran over something. Its very violent experience.

BrokenVert · 08-06-2012, 11:20 AM

Quote:

Originally Posted by Dackelone

IF you really did have a misfire, your SES and ECL would have gone off. (unless your tune has auto clearing enabled!)...

Also... when your engine misfires... you will FEEL it! Our cars really shake when there is a misfire. It feels as if your driving on square tires or you ran over something. Its very violent experience.

yep. you feel like youre a kid sitting on a school bus again

e82n54 · 08-06-2012, 02:05 PM

Thanks guys. I didn't notice any roughness or even performance loss so it must not be a misfire issue.

Cobb says it could be a wastegate trying to deal with the boost. I was told to do data logging while trying to replicate the issue. Cobb will then tell me what the data means. If I can replicate the sound I should be able to figure it out.

Thanks for your input guys!

08-06-2012, 09:36 AM	#1
e82n54 Private First Class Drives: '09 135i 6MT Alpine White Join Date: Jan 2011 Location: Houston, TX Posts: 168 iTrader: (1)	What does misfire sound like? While at the track on Saturday I heard a strange noise and my instructor said it sounded like the engine was misfiring. The sound was like a low fluttering rumble. It only happened at wide open throttle at 5,000 rpm and above. I didn't notice reduced performance. There were no warning lights. I had the N54 tuned to stage 1 aggressive (Cobb tuning) when this happened. I decided to remove the tune and see if it happened again. It didn't happen again after removing the tune. I should have checked for thrown codes before detuning, but I forgot. So, what does a misfire sound like? Thanks
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08-06-2012, 11:13 AM	#3
Dackelone Moderator Drives: 135i Silber mit/Rot 6MT N54 Join Date: Feb 2010 Location: Bayern, Germany Posts: 13,031 iTrader: (0)	IF you really did have a misfire, your SES and ECL would have gone off. (unless your tune has auto clearing enabled!)... Also... when your engine misfires... you will FEEL it! Our cars really shake when there is a misfire. It feels as if your driving on square tires or you ran over something. Its very violent experience. __________________ Dackel's European Delivery Museum Guide 1addicts at Stelv1oPass

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08-06-2012, 11:05 AM	#2
addict135i Lieutenant Drives: 135i Join Date: May 2012 Location: Los Angeles Posts: 575 iTrader: (3)	I had a similiar noise, it was a misfire! Get that checked out!

08-06-2012, 02:05 PM	#5
e82n54 Private First Class Drives: '09 135i 6MT Alpine White Join Date: Jan 2011 Location: Houston, TX Posts: 168 iTrader: (1)	Thanks guys. I didn't notice any roughness or even performance loss so it must not be a misfire issue. Cobb says it could be a wastegate trying to deal with the boost. I was told to do data logging while trying to replicate the issue. Cobb will then tell me what the data means. If I can replicate the sound I should be able to figure it out. Thanks for your input guys!