CEL at 4k RPM's

shaun671 · 03-15-2013, 08:58 PM

Hey Guys,

So I don't post here very often but I ran into a little issue and I want to get your guys take on this. I was getting on to the highway today and when getting up to speed I hit around 4k RPM's when all of a sudden the car sputtered, a CEL came on, and the car ran really rough. Acceleration seemed rough like the car was running in limp mode or something (if that's even the right term).

I get off the highway and pull over to the side and turn off the car. I checked under the car and the engine bay for any fluid leaks and there don't seem to be any. I turned the car back on and now the CEL is gone and the car seems to be running as normal again. I revved it a little to see if I hear any mechanical damage and there doesn't sound like there is any.

I've been noticing lately too (before the incident) that if I push the car a little the power seems to drop off/flatten out around 4k RPM's then pick back up again.

I was able to drive the car home and plan to take it to the dealership tomorrow. I don't have much experience with repairs but from the experience I do have this sounds like it might be a ECU/Tuning issue. The car is bone stock with the exception of springs and audio equipment. The car is at 65k so it's out of warranty so I wanted to get your guys take on this before I go into the dealership.

caliguy562 · 03-15-2013, 09:09 PM

I suggest investing in a bt cable in order to pull codes, in addition to doing other cool stuff. It'll help you from being hosed by the dealer. To answer your question, sounds like coils or plugs going out on you. With the bt cable, you would know which cylinder was misfiring.

shaun671 · 03-16-2013, 11:48 AM

Yea your right I should probably invest a BT cable if I decide to keep the car long term. So you think it's the coils/spark plugs? If so that shouldn't be too bad of a fix.

Anyone else have any ideas?

enrita · 03-16-2013, 12:13 PM

yeah read the codes

Wolf 335 · 03-16-2013, 12:22 PM

Had the same problem.

Its your injectors.

shaun671 · 03-16-2013, 12:28 PM

Quote:

Originally Posted by Wolf 335

Had the same problem.

Its your injectors.

Damn...if this is the problem is this an expensive fix?

caliguy562 · 03-16-2013, 12:32 PM

Coils, plugs, and injectors all display the same symptom. Pulling the codes will help with choosing which direction you want to go in. I would start with replacing all plugs first if you're still on originals. Swapping coils to determine the failed one is cheaper than replacing all six. The dealer may want to start with injectors as they are the most expensive out of the group, but not always the root cause.

Wolf 335 · 03-16-2013, 12:41 PM

Initially they told me it was the ignition coil so they replaced it then the next day same problems came up. This time it was injectors and an O2 sensor. Dealer scammed me for warranty deductible twice!

Here you go take a look.

http://www.e90post.com/forums/showthread.php?t=772935

shaun671 · 03-16-2013, 01:12 PM

Quote:

Originally Posted by Wolf 335

Initially they told me it was the ignition coil so they replaced it then the next day same problems came up. This time it was injectors and an O2 sensor. Dealer scammed me for warranty deductible twice!

Here you go take a look.

http://www.e90post.com/forums/showthread.php?t=772935

Damn you weren't kidding when you said the exact same thing happened to you. My dealerships service dept is closed right now so I have to take the car in Monday. I hope it's nothing crazy since the car is out of warranty.

Wolf 335 · 03-16-2013, 01:34 PM

thankfully i was under warranty.

Take it in to an independed bmw mechanic. Dealer will charge you quite a bit for the work. Once you scan her youll have a better idea.

There is a user on here currently parting out an engine and he's selling injectors, maybe even coils.

http://www.e90post.com/forums/showthread.php?t=806057

http://www.e90post.com/forums/showthread.php?t=806556

cn555ic · 03-16-2013, 03:10 PM

Same symptoms....check your codes i bet 29DC and 29F3...Your Low pressure sensor has taken a crap.

GTstunna612 · 03-16-2013, 04:01 PM

can be a lot of issues one thing I learned is to read the codes can be....plugs, injectors, coil packs, vacuum leak, senors etc

shaun671 · 03-16-2013, 06:32 PM

Took the car to a shop near my house for a diagnostic read and they don't see any error codes thrown...weird. Car seems to be running fine again and I got on it a little bit earlier to see if I can recreate the error code and nothing. Maybe it was just a misfire and the car shut the cylinder down....is that even possible?

03-15-2013, 08:58 PM	#1
shaun671 Private 4 Rep 62 Posts Drives: 2007 Sparkling Graphite e92 MT Join Date: Oct 2011 Location: Arizona iTrader: (0)	CEL at 4k RPM's Hey Guys, So I don't post here very often but I ran into a little issue and I want to get your guys take on this. I was getting on to the highway today and when getting up to speed I hit around 4k RPM's when all of a sudden the car sputtered, a CEL came on, and the car ran really rough. Acceleration seemed rough like the car was running in limp mode or something (if that's even the right term). I get off the highway and pull over to the side and turn off the car. I checked under the car and the engine bay for any fluid leaks and there don't seem to be any. I turned the car back on and now the CEL is gone and the car seems to be running as normal again. I revved it a little to see if I hear any mechanical damage and there doesn't sound like there is any. I've been noticing lately too (before the incident) that if I push the car a little the power seems to drop off/flatten out around 4k RPM's then pick back up again. I was able to drive the car home and plan to take it to the dealership tomorrow. I don't have much experience with repairs but from the experience I do have this sounds like it might be a ECU/Tuning issue. The car is bone stock with the exception of springs and audio equipment. The car is at 65k so it's out of warranty so I wanted to get your guys take on this before I go into the dealership.
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03-15-2013, 09:09 PM	#2
caliguy562 Lieutenant 8 Rep 476 Posts Drives: E92 335i Join Date: Dec 2007 Location: garaged somewhere in soCal iTrader: (3)	I suggest investing in a bt cable in order to pull codes, in addition to doing other cool stuff. It'll help you from being hosed by the dealer. To answer your question, sounds like coils or plugs going out on you. With the bt cable, you would know which cylinder was misfiring.
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03-16-2013, 11:48 AM	#3
shaun671 Private 4 Rep 62 Posts Drives: 2007 Sparkling Graphite e92 MT Join Date: Oct 2011 Location: Arizona iTrader: (0)	Yea your right I should probably invest a BT cable if I decide to keep the car long term. So you think it's the coils/spark plugs? If so that shouldn't be too bad of a fix. Anyone else have any ideas? Last edited by shaun671; 03-16-2013 at 12:21 PM..
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03-16-2013, 12:13 PM	#4
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	yeah read the codes __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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03-16-2013, 12:22 PM	#5
Wolf 335 Brigadier General 2341 Rep 3,542 Posts Drives: 2007 E92 335i Join Date: Aug 2012 Location: GTA - Greater Toronto Area iTrader: (0)	Had the same problem. Its your injectors.
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03-16-2013, 12:32 PM	#7
caliguy562 Lieutenant 8 Rep 476 Posts Drives: E92 335i Join Date: Dec 2007 Location: garaged somewhere in soCal iTrader: (3)	Coils, plugs, and injectors all display the same symptom. Pulling the codes will help with choosing which direction you want to go in. I would start with replacing all plugs first if you're still on originals. Swapping coils to determine the failed one is cheaper than replacing all six. The dealer may want to start with injectors as they are the most expensive out of the group, but not always the root cause.
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03-16-2013, 12:41 PM	#8
Wolf 335 Brigadier General 2341 Rep 3,542 Posts Drives: 2007 E92 335i Join Date: Aug 2012 Location: GTA - Greater Toronto Area iTrader: (0)	Initially they told me it was the ignition coil so they replaced it then the next day same problems came up. This time it was injectors and an O2 sensor. Dealer scammed me for warranty deductible twice! Here you go take a look. http://www.e90post.com/forums/showthread.php?t=772935
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03-16-2013, 01:34 PM	#10
Wolf 335 Brigadier General 2341 Rep 3,542 Posts Drives: 2007 E92 335i Join Date: Aug 2012 Location: GTA - Greater Toronto Area iTrader: (0)	thankfully i was under warranty. Take it in to an independed bmw mechanic. Dealer will charge you quite a bit for the work. Once you scan her youll have a better idea. There is a user on here currently parting out an engine and he's selling injectors, maybe even coils. http://www.e90post.com/forums/showthread.php?t=806057 http://www.e90post.com/forums/showthread.php?t=806556 Last edited by Wolf 335; 03-16-2013 at 01:42 PM..
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03-16-2013, 03:10 PM	#11
cn555ic 441 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	Same symptoms....check your codes i bet 29DC and 29F3...Your Low pressure sensor has taken a crap.
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03-16-2013, 04:01 PM	#12
GTstunna612 Lieutenant 50 Rep 512 Posts Drives: BMW Join Date: Feb 2008 Location: Tampa, FL iTrader: (0) Garage List E90 335i [0.00]	can be a lot of issues one thing I learned is to read the codes can be....plugs, injectors, coil packs, vacuum leak, senors etc __________________ E90 335i Alpine White E90 328i Titanium Silver
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03-16-2013, 06:32 PM	#13
shaun671 Private 4 Rep 62 Posts Drives: 2007 Sparkling Graphite e92 MT Join Date: Oct 2011 Location: Arizona iTrader: (0)	Took the car to a shop near my house for a diagnostic read and they don't see any error codes thrown...weird. Car seems to be running fine again and I got on it a little bit earlier to see if I can recreate the error code and nothing. Maybe it was just a misfire and the car shut the cylinder down....is that even possible?
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