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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Oct-10-2017, 10:34:52 PM   #1
CNano8
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Default Misfires/rough driving after VANOS work!

Hey guys so I've just finished up installing a new exhaust hub since my old one was cracked. Both tangs were broken off in the oil pump disc but thankfully stayed in there which saved my engine! Dr Vanos re-drilled my disc for me with smaller holes and I put in a new oem exhaust hub assembly including the timing chain gear. While I had the vanos removed I rebuilt it using the Beisan kit and following their detailed instructions and that seemed to go just fine.

Before I go any further, *full disclosure* while removing the vanos solenoid I dropped it like a jackass.. It landed right on the connecter part and a piece of it broke off. The harness connector still goes on and stays there with a zip tie. I know these things are prone to having the solder joints crack under normal conditions, never mind giving it a 3' drop to a concrete floor so it may be f*cked but I dk. I did clean the solenoid assembly using magnets and brake cleaner as directed in the Beisan instructions.

So I finish the install, the splined teeth are in their correct slots (first available tooth etc), checked cam timing with the alignment bridge, rotated engine by hand and checked again. I was fairly confident this job was done so I buttoned things up and nervously fired up the car. It started fine, idled fine and revved fine (idle-2.5k rpm) so I burped the cooling system and stopped for the night. The next morning I put the car on the ground and again it started fine, idled fine and warmed up as normal. I took it for a test drive just slowly cruising around my neighborhood in 2nd, 3rd and 4th gears letting the car get to temperature. The car was running like new then about 10 minutes or so into cruising the car started stumbling and misfiring badly. In my head I'm thinking wtf is this about the car was just fine.. then it proceeded to get a bit worse with the stumbling and to a point where the car was barely drivable and threw the SES light (codes below). The exhaust note sounded like a Subaru. I babied it home and pulled the valve cover thinking my timing was off or something because I was relatively sure the ignition coils weren't bad but now I'm not so sure because I believe they're Bremi coils. NGK spark plugs only have 10k on them. What I find odd is if the timing was set incorrectly shouldn't have the car ran like shit from the first start?

My thinking is I have 3 possible problems:
Messed up the hub/vanos install and timing is not correct (this does not explain why the car drove fine for the first 10 minutes)
Coil packs went bad during the test drive (would explain why the car ran fine for 10 minutes then had issues)
Vanos solenoid is bad from me dropping it on the floor (im not sure if this will cause immediate issues during cold start or not)



NOTES/NEW PARTS (all oem bmw parts besides beisan)
'06 M3 ZCP with 51000 miles

-Exhaust hub assembly
-Beisan vanos rebuild
-timing chain guide
-timing chain tensioner
-coolant expansion tank
-all coolant hoses
-waterpump
-thermostat

SES Codes
P0420 (had this thrown a couple times before from my exhaust)
P0430 (had this thrown a couple times before from my exhaust)
P0300
P0302
P0305


What do you guys think? Any help would be appreciated. Thanks

https://drive.google.com/file/d/0B0i...ew?usp=sharing (cam pics)
https://drive.google.com/file/d/0B0i...ew?usp=sharing (cam pics)
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Old Tue, Oct-10-2017, 11:17:58 PM   #2
L0ADED
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Default Re: Misfires/rough driving after VANOS work!

The P030X codes are for misfires which usually are caused by faulty coil packs. Since it is on multiple cylinders, might want to check if they are fully seated and the spark plugs are torqued to spec. Otherwise, could be the solenoid plug is not staying seated or it was internally damaged in the fall, and you might need to check with good unit. Usually, that should throw a specific code. The other two codes are for cat inefficiency. If you had not just worked on your VANOS system, I would say this looks more like a swapped or bad pre O2 sensor.
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Old Wed, Oct-11-2017, 12:36:34 AM   #3
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Default Re: Misfires/rough driving after VANOS work!

did you disconnect the oxygen sensors before removing the valve cover?
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Old Thu, Oct-12-2017, 12:26:35 AM   #4
CNano8
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Default Re: Misfires/rough driving after VANOS work!

Hey guys thanks for the replies but I did not remove the o2 sensors, there was some slack in the wiring harness maybe due to the Supersprint exhaust/headers. I moved the 2nd coil pack into the 3rd cylinder and the 5th pack into the 6th cylinder expecting to see P0303 and P0306 with a very bad idle. I start the car and to my surprise it starts and idles just perfect!? I let it sit and idle for about 5-10 minutes and give it a little gas to move the rpms around a bit and it was fine. So I decided to take it for a drive and 10 minutes in everything is running perfect so I start driving it a little more aggressively to get the vanos to operate a bit more. I drove the car for about 45 minutes and did a couple 3/4 throttle runs to 6k and it ran beautifully without a hiccup. I swore I was going crazy but I was happy that the car seemed fine but still nervous that I didn't fix the problem. When I got it home I scanned it just to see if anything would come up and it did not have any codes. Im now thinking that I originally did not have the coil packs pushed down all the way which caused the misfire. Ill be driving the car more tomorrow just to confirm things are good. If symptoms do come back ill post it in here. Thanks
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Old Thu, Oct-12-2017, 12:32:50 AM   #5
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Default Re: Misfires/rough driving after VANOS work!

Most likely, your coil wasn't seated all the way even if it looks and feels like it is. Happened to me when I replaced all my coils due to 1 failed coil.
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Old Sun, Oct-15-2017, 10:41:33 AM   #6
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Default Re: Misfires/rough driving after VANOS work!

hmmm happened to me as well
multiple misfire without fuel cutoff.
mine ended up being a dirty vanos valve body.
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Discussing Misfires/rough driving after VANOS work! in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)