E46 330 How sensitive are the lambda sensors? (FIXED - CCV Issue)
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  1. #1
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    How sensitive are the lambda sensors? (FIXED - CCV Issue)

    I got the Lamda control bank errors again which last time was the DISA valve, so I knew there was a vacuum leak somewhere.

    Under the bonnet this time I found that this thing was half out, pipe thing that connects to the air intake after the MAF sensor. (I must have disturbed it while sorting out the cooling system) :


    I've fixed it back in and checked the pipes after the MAF sensor for any cracks/tears and there doesn't appear to be. I've also reset it on INPA.

    My question is are the sensors that sensitive that this pipe being half out could bring up an error/rough idle or is there something I'm missing?

    P.s. I've driven around for about 20 miles today and the light hasn't come back on, nor is it rough on idle.

    Thanks guys!
    Last edited by Nathb; 22-11-2012 at 18:57.

  2. #2
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    Quote Originally Posted by Nathb View Post
    My question is are the sensors that sensitive
    Yes, extra unmetered air is/was entering the engine.

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    Ah good, wasn't sure whether such a small thing could be out of it's tolerance or not.

    Thanks buddy!!

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    Bloody car.

    Reinstalled the pipe and drove 200 miles down to london (it was running fine) and the light came back on, it also sounded like a whistle when moving but not touching the accelerator.

    I had a quick look and reset it in London and drove back and it didn't come on, the day after nipping to tesco on popped the light.

    On inspection there is a rip in the second intake boot (closest to throttle body) in the small pipe.

    I've got one on order from BM however for the time being I've put a temporary bicycle patch over it, but it is still rough as anything and the whistle is still there when not accelerating (but not on idle yet).

    Is there something else I need to be looking at? (the disa was only replaced last month).

    Thanks

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    I feel your pain mate i'm trying to get to the bottom of vacuum leaks! i also have the same faults showing on INPA as you do


    I have replaced the CCV and split vac pipe to fuel rail so far?

    I'm wondering if resetting the adaption values would help? rather than just clearing the error memory?

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    notorious on the big 6 engine vac leaks lower boot is the biggest culprit...


    check ya LTFT figures after a solid drive if its above +2% the ECU is adding fuel it should be as close to zero as it can anything over +8% will trigger the emmisions light on the dash... hence ya can go 50 mile it comes on and reset it and the next ya go 200 mile and it comes on...

    mine went nearly 500 mile after i reset it then it went off after 90 miles it turned out it was the lower boot split at the ICV elbow mine was peaking at +12% trim..

  8. #7
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    Thanks guys.

    Not sure if my engine is affected by the chewbacca issue, but I tested for it and it wasn't present.

    DD - the lower elbows small pipe, what does that attach to? I know the big one attaches to the TB.
    Is it something to do with air return?

    Found my old 320i's boot, it's split in nearly exactly the same place.
    Last edited by Nathb; 22-10-2012 at 10:12.

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    I've replaced the intake boot this morning, which was a horrible job!!

    Anyway it still has a bloody misfire!!

    Kinda sounds like there is air escaping around the DISA, but its less than 2 months old? Can one fail in that short period of time?

    I've inspected all the pipe work after thr maf and no signs of leaks.

    Now should I ask BMW for a new DISA, after inspection, or do you think my MAF sensor could be to blame? I'm thinking the first one as it sounds like air is escaping... Any help would be appreciated.

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    you need INPA info to confirm wots happening...any eaking air signs aint good tho you could have a iffy disa gasket they are easily damaged..

  11. #10
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    Quote Originally Posted by dailydoggy View Post
    you need INPA info to confirm wots happening...any eaking air signs aint good tho you could have a iffy disa gasket they are easily damaged..
    Thanks DD!

    I know you need the error codes, but is there any other screens that might help with a diagnostic?

    I didn't fit this DISA myself so I'm going to pull it off on Monday and inspect it. The noise is very similar to previous noise of a broken DISA though.

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