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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 10-11-2012, 10:01 AM   #1
darkblue
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E46 M3 check engin light came on! Help needed!

02 E46 M3 @100000km, mannual.

symptoms are:

01. check engin light went on.

02. rough idle, you can feel the car is shaking a little, however the rpm is steady at around 900.

03. foot down, no go! can only be going at around 20~30km/h, car jerk badly even if you step down the gas all the way. It feels like one or more cylinders aren't firing properly.

04. oil pressure normally reads 1.5 at idle, but now it almost doubled at 2.8(forgot the unit)

It was all fine, after I stop for a meeting for about 30mins, things start to go wrong...

Anyone who has similar experience please do offer some suggestions, I would like to know what went wrong(roughly) before I got ripped off by the stealer tomorrow~
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Old 10-11-2012, 10:05 AM   #2
lucky_doggg7
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Check coils, the MAF, then the Cam Position Sensors...
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Old 10-11-2012, 10:24 AM   #3
e46techtuner
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Just get the code(s) read somewhere. Some places can scan it for free.
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Old 10-11-2012, 10:33 AM   #4
darkblue
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2 years ago, it was around 86000km, the check engin light came on once.
everything else is fine, no rough idle, no power loss, no increase in oil pressure...etc.
however, the diagnosis said the MAF is dead, so I did replace the MAF, and the check engin light went off.

since MAF has just been replaced not long ago, the cause should be the coils or the cam position sensors...

anything else?
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Old 10-11-2012, 10:38 AM   #5
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BTW, anyone knows how much does it cost to replaced a set of coils and cam position sensor?
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Old 10-11-2012, 10:56 AM   #6
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At a Dealer, if I were to shoot from the hip, I'd say $1000 for 6 new coils, and 2 new cam position sensors.

Alternatively, I think new Bosch coils sell for around $40 dollars each from say BMP or ECS, and the sensor is about $140 dollars for each sensor, according to Turner's website. Don't pay $120 to $140 per hour for shop time labor at a Dealer when you can do this work yourself.
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Old 10-11-2012, 11:17 AM   #7
illestminimike
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This thread is pointless until you have the codes read.
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Old 10-11-2012, 11:28 AM   #8
darkblue
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very appreciated for every reply so far!

I wouldn't say it's pointless, at least it gave me a rough idea what may have gone wrong and how much I need to pay to get it fixed!
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Old 10-11-2012, 11:42 AM   #9
taylor192
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Originally Posted by darkblue View Post
I wouldn't say it's pointless, at least it gave me a rough idea what may have gone wrong and how much I need to pay to get it fixed!
No, its pointless cause it could be anything from a bad coil to a vanos problem.

Why get ripped off by the stealer when you can get the codes read and start to diagnose the issue.

The only advice in this thread should be to go to an auto parts store and buy a $30 code reader. Cheaper place to start than a dealership.
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Old 10-11-2012, 05:15 PM   #10
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Before replacing any parts get ahold of a scan tool. I highly suggest a Peake reader (LINK) over a generic code reader. It will be able to pull the BMW specific codes and give you a better understanding of what's going on.


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Old 10-11-2012, 05:50 PM   #11
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^^ I have a peak tool and even though its only for BMWs its saved me more then ten trips to any dealership or mechanic and has saved me so much time and money on my 330ci , 4.4 x5, e92, e46 m3.

once you getthe code which will point to the problem, solving it is only a search and ordering a part online away.

I highly recommend this.
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Old 10-11-2012, 07:42 PM   #12
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Quote:
Originally Posted by illestminimike View Post
This thread is pointless until you have the codes read.
Yup

Quote:
Originally Posted by darkblue View Post
very appreciated for every reply so far!

I wouldn't say it's pointless, at least it gave me a rough idea what may have gone wrong and how much I need to pay to get it fixed!
Nope, it hasn't. It's given you random ass guesses. Get your codes read.
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Old 10-11-2012, 11:35 PM   #13
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^^^ exactly this .
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Old 10-12-2012, 07:24 AM   #14
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So...I managed to get a shop read the code for me, I forgot what exactly the code was, but it turns out that cylinder 1 is not firing properly; so the computer cut the fuel supply to prevent further damage to the engin.

The shop was going to replaced just the bad coil to save my pocket, but I have them replaced all the coils and spark plugs just incase I had to come back for another fail unit. Now she runs like a proper ///M car !

I am so glad that it's not some expensive sensors need to be replaced, and I definitely will get the scan tool suggested a few post above.Thanks to everyone who answered this thread!
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Old 10-12-2012, 07:44 AM   #15
lucky_doggg7
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Congrats on getting your sled fixed. As for the pencil coil, be sure it is Bosch, NOT Bremi and sure as Hell not STI coils; STI coils, which have the Bremi stamp on them are pure trash. When you have time, install a set of iridium plugs; they fire just a bit hotter to lower the hydrocarbon content in the exhaust.
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Old 10-12-2012, 10:16 AM   #16
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Glad she's back on the road and running like a champ!
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