1994 E36 M43B18 Air intake problems

Notices
 

Thread: 1994 E36 M43B18 Air intake problems

Reply to Thread
Results 1 to 7 of 7
  1. 1994 E36 M43B18 Air intake problems 
    #1
    BMW Fanatic
    Car Details
    Snowdog's Car Details
    Model of Car:
    318i
    Year of Manufacture:
    1994
    Transmission Type:
    Manual
    Car Body Type:
    Saloon
    Snowdog's Avatar
    Join Date
    Oct 2011
    Location
    Swindon
    Posts
    40
    Images
    1
    Thanks
    10
    Thanked 3 Times in 3 Posts
    Suppose i should start from the beginning.

    Im currently attemping to put the upper throttle body section from an M44 engine onto my M43 engine. The sizes are a perfect match but the difference is the M43 has a single barrel throttle body and the M44 is double barrel.

    Since i was doing the air intake i bought myself a cone filter to put inside an insulated heatbox i have ready. The problems started when i decided to test the "boy racer" way of seeing if the cone itself increases power. Now i already know it doesn't due to taking in warmer air, but just for a laugh i tried it.

    (From here on you will have to excuse my complete lack of knowledge of all the technical names for the parts so i will do my best to describe them).

    The only problem is the tube that goes between the throttle body and the standard filter won't take a cone filter. So i fitted part of the pipe from the M44 engine, which takes the cone. However during the change a plug (between the filter and the throttle body) needs to be removed. (Incidently this plug section is the part i changed). Once this plug is removed the engine will not idle properly.

    With the M43 pipe.

    The M43 pipe has a sort of moveable door inside the box this plug plugs into. Im guessing that senses airflow and changes the fuel needed in conjunction for when you put your foot down. However this doesn't explain the poor idle.

    With the M44 pipe

    There is no door, its just a straight pipe. But when you go hard on the throttle the car hits and almost deadly flat spot and struggles to accelerate at all until it hits the higher rev range.

    So i was thinking, is it possible for the engine to get too much air, or is that sensor in the M43 a way of ensure there is enough fuel for when you put your foot down. As you can probably already tell, the plug from my car will not fit on the M44 pipe. Which has a different size plug and a different way of sensing airflow.


    Any questions just ask, i'll be a happy to provide pictures if necessary. Also the throttle body thing might not work, but i'll start another thread for that when i get to it so we dont drift from topic.

    Cheers.
    To Do List
    • Restore to factory condition

    [
     
     

  2. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  3.  
    #2
    BMW Guru
    Car Details
    dazza316i's Car Details
    Model of Car:
    316i compact
    Year of Manufacture:
    1996
    Transmission Type:
    manual
    Car Body Type:
    hatchback
    dazza316i's Avatar
    Join Date
    Dec 2009
    Location
    bognor regis west sussex
    Posts
    1,659
    Thanks
    663
    Thanked 580 Times in 532 Posts
    The plug is for the Maf sensor mass air flow
    Surely m44 has one as well
    Although may look slightly different
    Have you tried plugging Maf in not online too see if it lidless
     
     

  4.  
    #3
    BMW Fanatic
    Car Details
    Snowdog's Car Details
    Model of Car:
    318i
    Year of Manufacture:
    1994
    Transmission Type:
    Manual
    Car Body Type:
    Saloon
    Snowdog's Avatar
    Join Date
    Oct 2011
    Location
    Swindon
    Posts
    40
    Images
    1
    Thanks
    10
    Thanked 3 Times in 3 Posts
    Quote Originally Posted by dazza316i View Post
    The plug is for the Maf sensor mass air flow
    Surely m44 has one as well
    Although may look slightly different
    Have you tried plugging Maf in not online too see if it lidless
    Yeah the M44 does have one but the plug is a 4 pin whereas the M43 is a five pin. Also the shape is slightly different.

    How do you do that "not online" thing?
    To Do List
    • Restore to factory condition

    [
     
     

  5. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  6.  
    #4
    BMW Guru
    Car Details
    dazza316i's Car Details
    Model of Car:
    316i compact
    Year of Manufacture:
    1996
    Transmission Type:
    manual
    Car Body Type:
    hatchback
    dazza316i's Avatar
    Join Date
    Dec 2009
    Location
    bognor regis west sussex
    Posts
    1,659
    Thanks
    663
    Thanked 580 Times in 532 Posts
    Should say inline bloody spellchecker
    Plug old one in and just rest Maf in engine bay
     
     

  7.  
    #5
    BMW Fanatic
    Car Details
    Snowdog's Car Details
    Model of Car:
    318i
    Year of Manufacture:
    1994
    Transmission Type:
    Manual
    Car Body Type:
    Saloon
    Snowdog's Avatar
    Join Date
    Oct 2011
    Location
    Swindon
    Posts
    40
    Images
    1
    Thanks
    10
    Thanked 3 Times in 3 Posts
    Quote Originally Posted by dazza316i View Post
    Should say inline bloody spellchecker
    Plug old one in and just rest Maf in engine bay
    I tried that, the car bearly rev'd high enough to stay on. Looks like the only way to do this is to somehow fit an enhanced filter to the orginal MAF or to find some sort of adaptor for the plug, (maybe a 5 to 4 pin, if something like that exists).

    How do people do it when they fit a performance induction kit? I assume there is a manufacturer fitted MAF on the tube? Or does the induction kit take into account the needs of the MAF and you just keep the standard MAF on and just change the tubing around it?
    To Do List
    • Restore to factory condition

    [
     
     

  8.  
    #6
    BMW Guru
    Car Details
    dazza316i's Car Details
    Model of Car:
    316i compact
    Year of Manufacture:
    1996
    Transmission Type:
    manual
    Car Body Type:
    hatchback
    dazza316i's Avatar
    Join Date
    Dec 2009
    Location
    bognor regis west sussex
    Posts
    1,659
    Thanks
    663
    Thanked 580 Times in 532 Posts
    keeps standard maf and uses pipe work adaptor
     
     

  9.  
    #7
    BMW Guru
    Car Details
    dazza316i's Car Details
    Model of Car:
    316i compact
    Year of Manufacture:
    1996
    Transmission Type:
    manual
    Car Body Type:
    hatchback
    dazza316i's Avatar
    Join Date
    Dec 2009
    Location
    bognor regis west sussex
    Posts
    1,659
    Thanks
    663
    Thanked 580 Times in 532 Posts
    got any pics of wot you have done
     
     

Tags for this Thread

View Tag Cloud

Posting Permissions
  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts