E46 318 general rough running - inpa live reading results
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  1. #1
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    Unhappy general rough running - inpa live reading results

    Hi Guys
    well first post and would have to be something potentially bad :P

    car
    2000 318ci
    m43 engine

    got the car a month ago, after turning 20 noticed insurance suddenly allows for better cars :P. its my first bmw and so far its been great just having a bit of a problem.

    when i got the car it had been sat for a long time and was running well considering this so decided to run it for a bit to make sure it wasn't just coked up. it improved a lot but still wasn't great so had a look around and found a lot of vacum hoses had split around the egr valve area, replaced them and all was good for a bit then went rough again. noticed the crankase breather was all falling apart at the back of the engine. so ordered a new hose and breather valve, but after this has gotten no better.

    the main problem apears to be at cold when the anti pollution pump is doing it's thing

    the codes which keep coming up are as follows

    171 - (written in German)

    141 - something to do with lamda probe (both read fine in inpa though :S)

    after all of this i decided to look at the live readings in inpa to see if anything could be seen in there.
    here are the results (screen shots were taken at idle).

    -reading-1-jpg-reading-2-jpg-reading-3-jpg


    there are 1 or 2 readings which are off the scale on the readout which must be a problem for the car, some of them being the

    load (of what ? :P),
    and the pulse duty factor i.s controller.

    I am not sure what these readouts relate to but these must contributing to the problem.

    I,m trying to get it running right asap because I want to get an lpg conversion done to the car asap as i do 20k+ miles a year and i am planning on keeping this car till my insurance has come down considerably more than it already has

    If anyone can shed any light i would be great full

    another thing. would it be of benifit to reset the adaption in INPA after doing the work i have already done to it? just wandered if since it had to compensate for a lack of vacum it would continue to do so because of the adaptions ?

    thank you

  2. #2
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    ide say you have some fuel mixture issues this will not be helped by iffy air pump and pipework either..

    141 is lambda regulation

    171 is fuel supply mixture control...

    petrols dont have EGR's by the way ...

    could be duff lambda or a host of other things..

    Duff MAF's are notorious failures on M43 engines aswell and cause alsorts of fueling and performance issues which are or can be worse when cold as the engine is running open loop relying on engine temp and MAF data only for fueling calculations till the lambda's kick in and control fueling...
    Last edited by dailydoggy; 06-08-2012 at 20:28.

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  4. #3
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    Yes I would reset the adaptions, what are the readouts like on the cylinders? Are they running rough?

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    Is your car fully up to temp on those readings?

  7. #5
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    Quote Originally Posted by Lee_h View Post
    Is your car fully up to temp on those readings?
    yeah it hadn't been on driveway long after a run on motorway when i took those readings

    also on the cylinder readings, cylinders 1 - 3 tend to have quite high readings i dont know what these readings are for though, is it showing misfires ?

    thanks guys

  8. #6
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    Quote Originally Posted by dailydoggy View Post
    ide say you have some fuel mixture issues this will not be helped by iffy air pump and pipework either..

    141 is lambda regulation

    171 is fuel supply mixture control...

    petrols dont have EGR's by the way ...

    could be duff lambda or a host of other things..

    Duff MAF's are notorious failures on M43 engines aswell and cause alsorts of fueling and performance issues which are or can be worse when cold as the engine is running open loop relying on engine temp and MAF data only for fueling calculations till the lambda's kick in and control fueling...
    ah i thought the egr valve was that bit the emissions pump attaches to on the front of the engine, as it looks very simular to an egr valve that was on my old deisel.

    the air pump seems ok It's a bit loud and makes the exsuast sound quite raspy till it dies off but seems to do its job the car just runs crap till its finnished. From cold acceleration is all over the place. once warm and upto speed it drives lovely, apart from at idle. one thing i've noticed is when warm at idle, only very occasionally there is a lot of vibration, its almost like a low hum coming from the engine, most of the time that doesn't happen though.

    i thought the maf but the readings for the maf in inpa are within spec so i wouldn't have thought to look in that direction. also both the lamda's seem to be reading ok

    would it be worth putting some injector cleaner through it ? before i got the car it had been sat on a four court of a local garage and it's last service was nearly 2 years before i got it, (according to service book) which shows how long its been sat for.

    are there any vacum hoses under the inlet manifold for the fuel system? i've changed all of the front hoses but wandered if there's any hidden ones waiting for me to discover them.

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    the m43 engine as far as i am aware should run higher than 83 degrees, mine runs at 104, yeah on the cylinder readings does it say it is running rough at the top?

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    ide try the obvious first fresh plugs and filters and double check all induction side hosework....


    unplug MAF briefly and see how it runs aswell..

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  12. #9
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    Quote Originally Posted by dailydoggy View Post
    ide try the obvious first fresh plugs and filters and double check all induction side hosework....


    unplug MAF briefly and see how it runs aswell..
    first thing i did when i got it was change all filters (inc fuel), plugs and give it fresh oil.

    I tried unplugging the MAF and the difference was night and day, ran a lot better albeit thirstier :P. None the less i took the maf out to have a look and it did look really clean so i didn't think there was a problem. after hosing it down with some cleaner anyway, it went back in the car and i must say that it is a hell of a lot better now . More torque on bottom end and overall much more pleasant, lot quieter too. i think it probably does need a new maf though as it still isn't 100% on idle. main bother now is that the first junction i get to in a morning the revs always bog right down when i press on the clutch. I'm suprised it caused error codes which didn't point to it

    Quote Originally Posted by Lee_h View Post
    the m43 engine as far as i am aware should run higher than 83 degrees, mine runs at 104, yeah on the cylinder readings does it say it is running rough at the top?
    i wasn't really paying attention how long i'd had it on drive before i took readings, i'll check it in morning after my run to work. its due a cooling overhaul anyway, the expansion tank has a tiny leak and the elbow which has the thermostat in it doesn't look too clever. got the bits just havent had chance to do it as need the car most days and its using maybie a mouthfull of water over a fortnight.

    and yeah it does say running rough although i havent checked now i've cleaned the MAF

  13. #10
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    just to report, changed the maf and it is now running fantastic!!!!

    its never ran this good since i've owned it .


    cheers guys

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