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Old 08-21-2012, 01:29 PM   #1
evolutionrob
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E46 wont start HELP with snap-on codes

Hi im new to this forum,

i have had my e46 318ti (n42 2 litre) sept 2001 (51) for 2.5 years its just ticked on to 171'000 miles over the past few months i have had to change the fuel pump and relay, and the breather hose on top of the engine.....

for past couple of months when first started it miss fires and runs rough for about 20 seconds then stalls then i try again and it starts and runs fine but wont rev over 5000 rpm in any gear, and power delivery is really unstable

i had it code read on a snap on reader and it threw up the following codes

272A L/R Adaption Multiplicative Areal Bank 1
272B L/R Adaption Multiplicative Areal Bank 2
27CE Load Sensor Monitering
27C3 Thermical Oil Level Sensor

The local garage couldnt make sense of these ....

since then within 2 months its not started atall 3 times not even firing left for 20 mins starts runs rough 20 secs then stalls then starts and runs but not reving over 5000rpm still,


so driving with this problem for some time i went with it as it was working ok and i had to get to work,

driving in the heat on saturday it lost all power to the throttle wouldnt even try to rev nothing there, then power came back after about 10 seconds, now it constantly runs rough and doesnt even start at times miss firing then stalling and sometimes stuggling to keep its self alive, i have had it read off snap on reader again returning these results...


272A L/R Adaption Multiplicative Areal Bank 1
272B L/R Adaption Multiplicative Areal Bank 2
27CE Load Sensor Monitering

271A Lambda in front of cat
2722 Lambda in front of cat Bank 2
2721 Lambda ASINS of cat Bank 1 (< excuse garage writing)
2727 Bank 2 as above
2799 abort du adaption because of enviroment
2825 lambda sensor Asins rear of cat (vi-test)
10278 (2826) undocumented

above was read after i had driven it 20 miles in 3 hours of constant breaking down every couple of miles so some code could be thrown up from rough running unburnt fuel in cat or what not but it has gone through a gallon of oil in past 3 months aswell, i have tried to be as specific as poss, if you guys cant help i will either have to take it to my local bmw specialist who also has snap on reader or the 100 + option of the main dealer would there reader be more specific we have had ideas of ecu, fuel rail, coil packs, and almost ruled out the crank sensor as it was running and starting ok what are your views please help i can do most the work myself i changed the clutch a year ago

Many thanks

Rob

Last edited by evolutionrob; 08-21-2012 at 02:00 PM. Reason: spelling
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Old 08-21-2012, 03:02 PM   #2
2003silver330i
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Just a guess...bad oxygen sensors or a bad MAF sensor
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Old 08-21-2012, 03:38 PM   #3
seattle86
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Sure sounds like a vacuum leak to me.

272A L/R Adaption Multiplicative Areal Bank 1
272B L/R Adaption Multiplicative Areal Bank 2

Means you're running lean. The DME is trying to compensate by dumping in more fuel to compensate for the extra air getting into the intake. The DME ran out of adjustment range in the long-term fuel trim so it could no longer add in more fuel, hence throwing the codes 272A and 272B.

I am not 100% positive, but I'm willing to wager that 272A and 272B codes map to P0171 and P0174.

http://forum.e46fanatics.com/showthread.php?t=922064

http://forum.e46fanatics.com/showthread.php?t=740718
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Old 08-21-2012, 04:03 PM   #4
evolutionrob
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ok brill, its a good start cause leaks are cheapish to fix just locating them, i took the inlet manifold off because i had to change the top breather pipe and the unit it clips into under the inlet manifold, as far as i was aware i did every thing carefully, any pointers as to where to start looking, would the codes thrown up give a rough location? many thanks for the reply,

rob
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Old 08-21-2012, 04:20 PM   #5
rossisboss
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Quote:
Originally Posted by seattle86 View Post
Sure sounds like a vacuum leak to me.

272A L/R Adaption Multiplicative Areal Bank 1
272B L/R Adaption Multiplicative Areal Bank 2

Means you're running lean. The DME is trying to compensate by dumping in more fuel to compensate for the extra air getting into the intake. The DME ran out of adjustment range in the long-term fuel trim so it could no longer add in more fuel, hence throwing the codes 272A and 272B.

I am not 100% positive, but I'm willing to wager that 272A and 272B codes map to P0171 and P0174.

http://forum.e46fanatics.com/showthread.php?t=922064

http://forum.e46fanatics.com/showthread.php?t=740718

I concur.


also:
not 100% on BMWs but with everything else I'd start looking for a MAP sensor with the following code:
Quote:
27CE Load Sensor Monitering

and Lambda is referring to the o2 sensors in this case.
Quote:
271A Lambda in front of cat
2722 Lambda in front of cat Bank 2
2721 Lambda ASINS of cat Bank 1 (< excuse garage writing)
2727 Bank 2 as above
However, be careful as o2 codes can be caused by other issues. Things like air/fuel supply issues, or vacuum leaks, or bad sensor readings, such as the MAP sensor listed above, or the MAF. as always with cars there are 100 possibilities that you have to narrow down with testing. or throw parts at it.

it would benefit your wallet to get someone that can actually understand the live data function of that snap-on scanner to look for an irregularity in a sensor reading to at least get a good starting point for testing/diagnosis.

unfortunately codes are only the first step to finding some issues.

sorry for the poor grammar, in a hurry.
\
also the oil issue, ever replaced your crankcase vent system? it that's messed up massive oil consumption and subsequent sensor/sparkplug fouling will occur.
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Old 08-21-2012, 06:02 PM   #6
evolutionrob
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the image below is the part i changed which as far as i can tell is the crankcase vent system, i replaced the pipe and the unit itself, this was around 2 months ago, but the consumption of oil is still just as bad if not worse.. http://www.google.co.uk/imgres?um=1&...9&tx=128&ty=65

i am guessing if it a air leak it will be something i have disrupted while changing this component

Last edited by evolutionrob; 08-21-2012 at 06:48 PM.
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Old 08-21-2012, 10:14 PM   #7
rossisboss
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did you change the whole system or just the hose that is indicated by that arrow?
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Old 08-22-2012, 03:39 AM   #8
evolutionrob
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the whole system, hence taking the inlet manifold off to get to it

thanks
rob

reply on another forum First, make sure your battery is fully charged. Low voltages can cause some of these issues, plus your starting/running problems.
If your battery is staying low, it may be your alternator not charging, or your FSR (Final stage resistor for the aircon) draining the battery.
Then, unplug the MAF (Mass Air Flow Meter) and see if it runs any better then. If it does, clean or replace the MAF.
Also look for air leaks and the like. Taking a can of carb/brake cleaner and spraying it over the hoses on the engine will tell you if you've got a split hose somewhere. Revs rise? Bingo, there is your problem.

A gallon of oil in the last 3 months isn't out of spec, but i;'d also suspect that maybe the oil seperator (or Crankcase Control Valve) may need looking at or replacement too.

Last edited by evolutionrob; 08-22-2012 at 03:51 AM.
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Old 08-22-2012, 06:57 AM   #9
evolutionrob
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http://forum.e46fanatics.com/showthread.php?t=342081
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Old 08-22-2012, 07:23 AM   #10
evolutionrob
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also driving it while it was miss firing / running rough i noticed the traction control / dsc light flashing which is linked to the throttle body would this be a symptom of a air leak the fact that sometimes there is no response from the throttle aswell could also lead to the T/B any views on this
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Old 08-22-2012, 06:02 PM   #11
rossisboss
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the other reply does have a point. get your battery tested and make sure it's charged. dying batteries can cause funny issues.

If the DSC light was related to the throttle body I personally would expect a code to be thrown. the live data function on most scan tools should show the TPS (throttle position sensor) readout and you can look for issues there.

try the carb cleaner around any area you had apart first, then the rest of the intake/vacuum hoses.

I also agree with trying to unplug the MAF
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Old 08-23-2012, 02:46 AM   #12
evolutionrob
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thanks for the reply i have a new battery and alternator, but will stick the volt meter on her see what she is pulling ...

the car was running ok when i checked the mass airflow but i unplugged it the car faulted then picked up again ....

i picked my e46 up from the garage it started and ran badly, get it halfway home it starts to run a bit better,

i took of air box and cleaned all the sensors i could in that area, spraying about with penetrating fluid with no fluctuations in idle speed

i also removed and fully cleaned the camshaft sensors and decreased all of the muck and crud around them, they where filthy!

since then it has ran ok but still doesn't freely rev above 5000 rpm it feels like it runs out of power, it also starts badly miss fireing and running rough stalls then next turn of the key bam it works fin i drove it to work this morning the power delivery up to 5000 revs is great alot smoother with alot more power,

after about 10 miles it throws up the check engine light but doesn't seem to have changed in performance, i cannot easily get these codes read unless i can blag the garage to do it...

... when i started the car with the airbox off it seemed to start fine with it on it started rough i will confim by unplugging maf and starting it compared to plugged in and come back with the results


any ideas?

many thanks

Rob

Last edited by evolutionrob; 08-23-2012 at 05:05 AM.
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Old 08-23-2012, 07:30 AM   #13
evolutionrob
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... when i started the car with the airbox off it seemed to start fine with it on it started rough i will confim by unplugging maf and starting it compared to plugged in and come back with the results ...

i have done this test 3 times with maf plugged in every time it starts rough ...
and 3 times unplugged and it starts fine ...

i will clean the sensor after work and report back with my results
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