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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 12-06-2016, 12:24 AM   #1
i<3e46m3
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How screwed am I ?

Hi everyone so I was driving home and was in 5th gear when I hit a bump not a large one, similar to running over railroad tracks that sit in the road. Anyway I didn't think much of it until about 5 seconds later when my car shifted into neutral and continued to redline until I pulled off the road and shut it off (note I only shut it off because it was revving like I was flooring it but I was not touching the gas). after letting it sit for a minute I started it back up and it stuttered a bit and had a very uneven idle bouncing between below 1k-almost2k since I was pretty close to home I figured I'd try and limp back than figure it out. It died a couple moments after I pulled off from the side of the road and would only stutter when I tried to start it. I had it towed home and just for giggles I tried starting it, It started and I drove it into my garage. I had a friend bring over a code reader and it said all cylinders are mis-firing and running rich. It's been sitting for a about 2 days now I tried starting it just to listen and it either stutters or has the uneven idle than dies. I'm planning on bringing it to the local garage this week but I'm just looking for some insight on how sore my ass is going to be from this bill.

2004 e46 m3 smg.
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Old 12-06-2016, 12:50 AM   #2
TWR
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Have you knocked off the Exhaust sensor?
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Old 12-06-2016, 07:40 AM   #3
Spannerhead
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What were the codes? That's the first thing the shop is going to check.
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Old 12-06-2016, 07:48 AM   #4
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Need codes, and the "running Rich" statement needs far more details.

Freeze Frame and warm idle Fuel Trim data would be useful if you can warm the engine up for 4-5 minutes at a minimum.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 12-06-2016, 09:45 AM   #5
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Just for clarity - the car shifted into nuetral on it's own and went full throttle without you touching the gas pedal?
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Old 12-06-2016, 11:06 AM   #6
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Also perplexing is how an M3 SMG pops out of gear by itself?
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Old 12-06-2016, 11:43 AM   #7
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I think he is either confused or he has a poltergeist problem.
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Old 12-06-2016, 12:17 PM   #8
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I'd say prepare yourself for significant buttpain. Be mentally prepared. Did the engine overrev
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Old 12-06-2016, 12:28 PM   #9
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Because you said you had all cylinders misfiring, it made me think something similar had happened to me..
I was driving home on a test drive about a mile out from the house last winter and the car tryed stalling on me and i must have been going 40 in 3rd or 4th gear between 2-3k rpm. It reminded me of that first time trying to get the car moving when learning to drive standard (that shaking and rattling). I also had minimal throttle response none the less. When I managed to jerk my way back home I ran' multiple cylinder misfires' for a code along with all individual cylinder misfires. My problem ended up being the dumb fact that I had left my PCV valve disconnected from the vanos area. From what I looked up my broblem was simply becuase of back pressure in the crankcase. I also got the rich fuel code which may have been from oil from blowby into the cylinders.

As far as your car popping out of gear goes, something similar happened to my buddies 330ci in reverse when stepping on the gas and we ended up seeing that the transmission mount had a broken bolt, so this caused the transmission to twist sideways when he stepped on it as well as the whole gear shifter. Maybe that bump was significant for you, could have busted a mount.

What was the last thing done to the engine/ driveline before this catastrophic failure?
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Old 12-11-2016, 08:02 PM   #10
i<3e46m3
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Quote:
Originally Posted by chesthing View Post
I think he is either confused or he has a poltergeist problem.
No poltergeists as far as I can tell I'll make sure to bless the oil before I change it next time. I'm taking it to the shop this week. It still starts but it's excruciating to listen to. I'll let you all know how sore my ass is after the bill.
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Old 12-11-2016, 08:51 PM   #11
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Determined to take it to a shop and get taken hard. Impressive
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Old 12-11-2016, 10:43 PM   #12
stahlgraue46
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why do you even have an account on this forum if you take your car to the shop?


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Old 12-12-2016, 06:19 AM   #13
i<3e46m3
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why do you even have an account on this forum if you take your car to the shop?


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Well, while there's quite a few things I can do my self. Seeing that I'm 17 and only have basic tools and I don't know exactly what's wrong with it I don't see anything wrong with taking it to the shop.
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Old 12-12-2016, 06:50 AM   #14
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I'd be scared taking a M3, SMG to a shop for any kind of work. Their going to charge up the ying yang
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Old 12-12-2016, 07:09 AM   #15
stahlgraue46
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i'm 17, i have basic tools.. all you really need is a set of sockets. if you buy an e46 (especially m3) you should be able to do all work on it yourself unless it's pulling an engine and you don't have a cherry picker. just finished rebuilding the top end of my 325i without anything crazy.


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Old 12-12-2016, 07:52 AM   #16
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What are the exact codes.
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