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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 02-01-2008, 02:06 PM   #21
ALPIN3
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Sounds like o2 sensors.

Some of these misfire issues also come from a really simple fix...

Needing a new gas cap.
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Old 02-01-2008, 02:17 PM   #22
Brian15
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Quote:
Originally Posted by ALPIN3 View Post
Sounds like o2 sensors.

Some of these misfire issues also come from a really simple fix...

Needing a new gas cap.
not that im questioning you by any means , but o2's could really be the culprit in a situation like this ?

im curious im chasing the same problems and at this point am leaning at some bent valves .
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Old 02-01-2008, 02:22 PM   #23
ALPIN3
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not that im questioning you by any means , but o2's could really be the culprit in a situation like this ?

im curious im chasing the same problems and at this point am leaning at some bent valves .
How many miles on the car?
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Old 02-01-2008, 02:55 PM   #24
Brian15
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How many miles on the car?
my car has 95k on it , but what throw's me off is cylinder number 2's compression is 140psi while the rest are 175 or so.
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Old 02-01-2008, 05:07 PM   #25
Jay9
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Originally Posted by Brian15 View Post
has the car seen any overly high rpm's lately ?
No not really.....i bring it up to about 5-6 k every now and then, but never redline. The car has about 123,000 miles, i bought it with 117,000.
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Old 02-03-2008, 08:26 PM   #26
emg2919
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same problem, same codes:

p1351
p1346
p1349
p1345
p1353

i know they are misfire codes as ive searched them. some are fuel cut off misfires and some just say misfire. i had a KN airfilter and that set off my SES light first, so I just switched back to a OEM mahle.

still have the same issues, this is also what ive changed:

new plugs
cleaned MAF with CRC
checked airflow boot (upper and lower, not cracked)
cleaned ICV
replaced adjuster unit (flap was broken, helped fix it a little, but not that noticeably, to me anyways)
ran Seafoam

going to change coils/boots soon. probably plugs at the same time.

let me know if anyone finds out what the issue is with this. Does a problem with this many cars warrant BMWNA to check into this as some sort of recall? If so, I'll gladly work on heading that up as I'm sick of this rough idle/misfire.
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Old 02-05-2008, 01:16 AM   #27
marinero
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I had the misfire code and also the misfire w/cut off in the cylinder # 1. I took my car to a shop located in the Washington DC area. They told me it is a bad coil; but they also said that the plugs were wed because gas were accumulated in the cylinder and it didn't allow the plug to work.
I don't know why they also changed the air filter. The point is that they are charging me 500.00 for this repair, parts included. It is the price OK? I would like to be sure it is a fair price and I can continue using this shop. They told me that my car needs new belts and the charge for this belt's job is 248.00. My M3 has 40,000 miles does it need new belts already?
Please I need an advise.
Thanks.
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Old 03-18-2009, 02:54 PM   #28
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I know this is an old thread but it doesn't seems like anyone has really solved this problem, my car has been doing this recently and before I throw $600 at it trying to replace parts I want to see if anyone has any new / updated information. It seems like everyone looks at O2 sensors, MAF, coils, and people have been saying they change them out and still have this problem. Whats the deal?
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Old 03-18-2009, 03:53 PM   #29
Jay9
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I posted in this thread a while back. I have the same issue but i've learned to deal with it. I never "let" my car misfire anymore. When i have to let the car idle at a stop sign or red light, i just rev it up a little to proactively stop the misfiring before it starts, and if on the off chance that is does misfire, i just restart the car and its back to normal.
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Old 03-18-2009, 04:11 PM   #30
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Here is what i fixed when my car was misfiring and started shaking. I got 10 codes from misfiring in cylinder 1-6 and lean bank 1 and 2. I change all the spark plugs and the was fine for about 3 weeks, then the SES lights comes back and car shake even worst. Then i replace all new coils and a new DISA Valve (adjuster unit)-my old one was crack big time. My intake elbow was crack so i reaplace that too....Now the car is running normal. I follow a DIY in here....if you search you will fine it.
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Old 03-18-2009, 04:16 PM   #31
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I'm may be suffering through this as we speak.

My research is indicating that the engine harness and Throttle Position Sensor are very suspect on the early E46. Apearently the harnesses are known for bad crimping on the contacts and can suddenly start throwing a pile of weird codes. The TPS has a known defect and warranty replcement if mfg. before 2002. My car is a 2001 325 wagon. My codes have been comming and then going away, and my car drives fine (no shaking) so maybe we are talking about two different things. Still, you guys might want to research the harness issues.

Cheers
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Old 04-07-2009, 11:51 PM   #32
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ya i have this same problem. i have replaced the ccv, coils, boots, plugs, intake boots, and MAF. i took it to the dealer awhile back and they are the ones that replaced the MAF and said it drove fine but the computer was still storing a misfire on #5 code. the mechanic said this could be a weak valve spring or even the DME? and about every 3 days the code would come and go and today i was in stop and go traffic and the car started shaking when i was accelerating. does anyone know if a weak spring or DME would cause this?
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Old 04-08-2009, 12:07 AM   #33
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I'm too lazy to read the other post right now but i bet your flap on your DISA valve broke

Dont ask me how or why but this happened to me and took mine off and the flap was jus chillin there im lucky it didnt get sucked in.........bout $200 at an indy shop

Number 7

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Old 04-18-2009, 06:55 PM   #34
aznblood
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I just experience random engine misfire on cylinders 1 and 6.
I've changed spark plugs, and that I will try to change the coils and Camshaft Position Senor next. After reading this thread, i fear that changing those stuffs wouldn't fix it; especially when someone mention about faulty EMU and also the broken DISA valve. Would someone please give up an update on EMU or DISA method, whether if it fixed it. thank you
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Old 04-27-2009, 11:01 AM   #35
felixzcat
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If you have the ability to read the codes then I would try swapping coils around to double check if the new code confirm a bad coil. My research on this forum indicates the harness and DISA valve are often suspect. DISA is easy to remove and check. Use the search function for "DISA". There are several threads on how to remove and check. Should be a ten minute job.

Cheers,
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Old 04-27-2009, 01:07 PM   #36
ou330ci
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does anyone have more info about the harness? maybe where and how much it would be to replace it?
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Old 04-27-2009, 01:47 PM   #37
felixzcat
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The harness is $300. First time DIY is said to be 6-7 hours

I believe the engine harness was a recall item up to 2002.

Cheers,
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Old 02-06-2011, 11:37 AM   #38
KohbraxE46
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i just changed my spark plugs a week ago set it to the right torque. the car was running great, and 4 days later, the temperature drops to 15-20 degrees, when 4 days ago it was in the 40-50s. that same day that i drive the car i get a check engine light, its cylinder 5 misfire, so i take it to my shop spark plug is fine ignition coil looks good so i switch the coil and the plug into cylinder 4 hoping the code would change to cylinder 4 and knowing that its a plug or coil. but the code stayed on cylinder 5 misifre, and it says its the worst possible state of misfire, . so could it be the cold weather, a clogged line my injectors, ????? someone help care shakes at idle and driving drives real rough
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Old 03-03-2011, 11:33 PM   #39
me43
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this may sound crazy--i do not know if anyone else gets this but some of what is described sounds simliar---for about a month now when i am stopped at a light or something--when i press the gas as i normally do it FEELS like the rear wheels are just spinning and hopping and the car doesn't really move-(a couple times the traction control light came on depending on how hard i hit the gas)-this is ALL the time--i let off the gas and back on easy and it feels normal again(this is also an automatic trans)--i now just ease the accelerater and this seems to work-once i feel it caught(after a few seconds) i hit the gas normally and it goes well---for some time(a few months)--when accelerating(entering highway) i felt it stumble and break up a little around 50-65---after that--ran smooth----i changed the valve cover gasket and cleaned the oil souked boots and plugs and it has ran better(about a month ago)--but i still get that stumble very slight and like once or twice--my MPG has also increased------anyway-about a week ago i was feelin a slight vibration at around 75-80(as usual for a month now) when i hit the gas--so i keep hitting the gas and off the gas to pinpoint what was going on--after a few times the check engine light came on and the vibration got much worse--off the gas or on the gas---the whole car vibrated and rumbled very loud!!--after a minute or so it was fine and the check engine light shut itself off in a minute--got to work next day tried to read codes but none found--a couple days later it happened again--the very second i put my foot on the gas the engine light just came on and the vibration started again--i got off the exit and stopped at a light--the car was misfiring and running rough---i turned it off and back on a few seconds later--car runs good-light is off-i got to work 5 minutes later to read the code--i did not even turn the key all the way to off(when i got to work)(i did at the light though)---no codes again---a couple days it's cool--except for the usual problem--then it happens today and i got a code--p1347-which said something like ignition module some s*it---i am wondering if this is the root of the problem--or do i have a problem in my driveshaft and this misfire makes it worse and it's juts conicedence that everything seems to be breaking at once on this car(washer fluid pump leaking,window switch button broke-can still use window switch still good, passenger door doesn't open from the outside and the valve cover gasket i just did)--maybe i can try to clean all grounds and computer--does anyone experience the same
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Old 03-19-2011, 11:43 AM   #40
Never Dies
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Just worked on one and changed the follwoing:

1) Engine and tranny mounts

2) 6 new coils

3) 6 new plugs

4) 6 flushed and rebuilt injectors (flow tested)

5) Fuel filter replaced

6) New throttle actuator (old one was broken)

7) No vacuum leaks

8) Camshaft and crankshaft sensors replaced

We're getting a Cyl.5 misfire, idles great and when you rev it to redline there is NO hesitation. Drive the car and apply the throttle smoothly and it drives like a dream, push the throttle suddenly and it well start shake. Oil separator is OK, no leaks there, no O2 errors as well.

Any thoughts?
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