2001 E46 320d - semi egr bypass - Page 3

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    #21
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    The engine will always know the amount of fresh air coming in through the MAF, so it uses the fresh air for the fuel calculations.
    EGR is behind the MAF, and close to inert so it doesn't need to worry about air/fuel ratios.

    The newer engines are smart enough to calculate the amount of extra gasses appearing that didn't come through the MAF and they are the ones that will spot if the EGR isn't working.
    Having a small hole in an EGR blank is enough to keep it happy.
     
     

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    #22
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    Quote Originally Posted by TheEnd View Post
    The engine will always know the amount of fresh air coming in through the MAF, so it uses the fresh air for the fuel calculations.
    EGR is behind the MAF, and close to inert so it doesn't need to worry about air/fuel ratios.

    The newer engines are smart enough to calculate the amount of extra gasses appearing that didn't come through the MAF and they are the ones that will spot if the EGR isn't working.
    Having a small hole in an EGR blank is enough to keep it happy.
    So what year did these newer smarter engines come into play?
     
     

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    #23
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    Well, it depends, the first EDC15s (DDE3/4) didn't pay much attention, EDC16 (DDE5 -6)which is pretty much everything from about 2002/3 onwards had the brains to figure it out more accurately, but I think it's the emissions EU levels where the ECUs started to pay attention to it, and flag errors because of the increase in NOx which it was meant to be keeping an eye on.
     
     

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    #24
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    Quote Originally Posted by TheEnd View Post
    Well, it depends, the first EDC15s (DDE3/4) didn't pay much attention, EDC16 (DDE5 -6)which is pretty much everything from about 2002/3 onwards had the brains to figure it out more accurately, but I think it's the emissions EU levels where the ECUs started to pay attention to it, and flag errors because of the increase in NOx which it was meant to be keeping an eye on.
    Beginning to wish I was as smart as my car, Just so frightened of doing something to my car that ends up costing me big £££ because I did not know what I was doing

    So not sure whether to semi bypass, fully bypass or just leave the hell alone with it .
     
     

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    #25
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    You can always put it back just as quick as fitting it.

    The best way to check is with other owners who have done similar, and it they have had any problems.
    The EU3 /EU4 change isn't immediately obvious to find, and in some cases, people run fine for weeks before a check engine light comes on, whilst others get it almost immediately.
    As an idea of how smart some BMWs can be, the 3.5 and 4.4 V8s calculate exhaust temperature to avoid condensation and can also monitor the oil temps looking for thinning oil from petrol leaking into the sump.

    Most ECUs can now figure out what gear you are in, and I've also just seen that some BMWs will deactivate Automatic cruise control if they are near a radio astronomy station so the professors don't pick up a 1.7 ton meteorite at exactly 55mph!
     
     

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    And THAT is why you know how to do what you do TheEnd
    I'm not a complete idiot...some of my parts are missing.
     
     

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    To Livebait yours is EU3, EU4 320d was introduced c.09/2004
    Quote Originally Posted by TheEnd
    but I think it's the emissions EU levels where the ECUs started to pay attention to it, and flag errors because of the increase in NOx which it was meant to be keeping an eye on.
    and thats why EGR delete on EU3 only stores EGR error codes in ECU and same EGR delete illuminates EML on EU4 engine,
    (tho this EML illumination can now be mapped out on EU4).
    Quote Originally Posted by DirtyTorquer
    And THAT is why you know how to do what you do TheEnd
    +1
     
     

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    I want my mum
     
     

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    Nice explination TheEnd.....think i,m with you now..obviously its not best having crappy exhaust fumes going back in the inlet side...only thing putting me off is the "alleged" increase in egt..didn't realise the maf was "downwind" of the egr so that explains that..what sort of temp rises at the turbo are you talking about ?? and what sort of tolerences are the turbo seals ok to take temp wise ?? also dont think I can just block mine (EU4)..I believe 7mm is the minimum to stop eml coming on ??
     
     

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    #30
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    Damn it!
    I wrote out a big reply, but wifi dropped out and hitting the back button doesn't get you to it!!

    Anyway, the abridged version is the EGR is after the MAF, but the ECU can figure out what came in clean, so know anything extra in the engine is EGR.

    EGR is used to cool gases to keep things cleaner than usual temps, so stopping EGR means it stays at normal temps rather than drops to cooler temps,
    ie - it isn't something required to control exhaust gas temperatures, and the ECU keeps an eye on EGTs anyway, so will keep them safe at all times
     
     

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